Dispersion compensation method, device and system

Abstract

A dispersion compensation method, device and system belong to the technical field of optical communication. The method comprises the following steps: a receiving node acquires a first dispersion spectrum, and performs first dispersion compensation on an optical signal received from an optical fiber link according to the first dispersion spectrum; wherein the first dispersion spectrum is an accumulated dispersion spectrum of at least one filter in the optical fiber link. The problem that the dispersion compensation effect of the optical signal is poor is solved, and the method and the device are used for performing dispersion compensation on the optical signal.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to a dispersion compensation method, device and system. Background Art

[0002] In the field of optical communication technology, a sending node and a receiving node are connected via an optical fiber link, and an optical signal is transmitted through the optical fiber link to perform communication.

[0003] Optical fiber links have dispersion, which causes signal damage when optical signals are transmitted on the optical fiber links, resulting in a deviation between the optical signal received by the receiving node and the optical signal sent by the sending node.

[0004] Currently, a receiving node is connected to an optical fiber link via a dispersion compensation unit. The dispersion compensation unit can compensate for the damage introduced by the dispersion of the optical fiber in the passing optical signal. However, the dispersion compensation effect of the optical signal is still poor. Summary of the invention

[0005] The present application provides a dispersion compensation method, device and system, which can solve the problem of poor dispersion compensation effect of optical signals. The technical solution is as follows.

[0006] In a first aspect, a dispersion compensation method is provided, the method comprising: a receiving node obtains a first dispersion spectrum, and performs a first dispersion compensation on an optical signal received from an optical fiber link according to the first dispersion spectrum. The first dispersion spectrum is an accumulated dispersion spectrum of at least one filter in the optical fiber link. The receiving node is connected to a sending node via an optical fiber link, and the optical signal is an optical signal sent by the sending node to the receiving node via the optical fiber link. The optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each of the at least one filter being connected between two adjacent optical fiber segments.

[0007] In the dispersion compensation method provided by the present application, the receiving node can perform first dispersion compensation on the optical signal based on the first dispersion spectrum to compensate for the damage introduced by the dispersion of at least one filter in the optical fiber link in the optical signal. In this way, on the basis of compensating for the damage introduced by the dispersion of the optical fiber in the optical signal, if the damage introduced by the dispersion of at least one filter in the optical signal is also compensated, the dispersion compensation effect of the optical signal can be improved.

[0008] In addition, in the related art, only the damage introduced by the dispersion of the optical fiber in the optical signal can be compensated, and this dispersion compensation method is relatively simple. In the present application, the damage introduced by the dispersion of the filter in the optical signal can be compensated, which enriches the dispersion compensation method of the optical signal.

[0009] There are various ways for the receiving node to obtain the first dispersion spectrum. For example, the receiving node is connected to the control node, and the receiving node can obtain the first dispersion spectrum by receiving the first dispersion spectrum sent by the control node. For another example, the receiving node obtains the first dispersion spectrum by itself.

[0010] By way of example, the receiving node first acquires the dispersion spectrum of each filter in the at least one filter, and then determines the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0011] There are various ways for the receiving node to obtain the dispersion spectrum of the first filter. For example, the receiving node receives the dispersion spectrum of the first filter input by the user; for another example, the receiving node receives the dispersion spectrum of the first filter sent by other devices; for another example, the receiving node obtains the dispersion spectrum of the first filter by looking up a table, reading data, etc. The first filter is any one of the at least one filter mentioned above.

[0012] In addition, the receiving node may obtain the dispersion spectra of different filters in the same or different ways, which is not limited in this application.

[0013] Optionally, when different filters correspond to different dispersion spectra, the dispersion spectrum of each filter is calibrated and stored in the corresponding filter. The receiving node reads the dispersion spectrum of the first filter from the first filter. For example, such filters are: wavelength selective switch (WSS) or arrayed waveguide grating (AWG). Such filters are called first-class filters.

[0014] Optionally, when filters with the same parameters correspond to the same dispersion spectrum, the receiving node obtains the parameters of the first filter, and queries the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter according to the parameters of the first filter to obtain the dispersion spectrum of the first filter. The parameters of the filter include: at least one of the type (model) of the filter and the channel bandwidth of the filter. This type of filter is an interleaver (ITL), which is called a second type filter.

[0015] It is understandable that at least one filter is the first type of filter mentioned above. Or, at least one filter is the second type of filter mentioned above. Or, a part of the at least one filter is the first type of filter, and another part of the filters is the second type of filter.

[0016] Optionally, the at least one filter is all filters or part of filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and a comb filter ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of the filter in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0017] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link.

[0018] For example, it is assumed that the basis for selecting the above-mentioned partial filter includes the dispersion spectrum of each filter in the optical fiber link, and the optical fiber link includes a second filter and a third filter, and the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter. Optionally, the second filter is a filter with the largest average value of each dispersion value in the dispersion spectrum in the optical fiber link. For example, the second filter is ITL and the third filter is WSS (or AWG). Then, the selected partial filter includes the second filter and does not include the third filter. It can be seen that when the receiving node selects a partial filter in the optical fiber link, it will select the second filter with relatively large dispersion, but will not select the third filter with relatively small dispersion. In this way, in subsequent operations, the receiving node only compensates for the larger damage caused by the dispersion of the second filter in the optical signal, and does not compensate for the smaller damage caused by the dispersion of the third filter in the optical signal. This not only reduces the dispersion that the receiving node needs to compensate, but also ensures that the dispersion compensation effect is better.

[0019] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the method further includes: the receiving node obtains a second dispersion spectrum of the optical signal, and performs a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments;

[0020] Optionally, the second dispersion compensation and the first dispersion compensation are performed sequentially, or the first dispersion compensation and the second dispersion compensation are performed sequentially, which is not limited in the present application.

[0021] There are various ways for the receiving node to obtain the second dispersion spectrum.

[0022] In an optional implementation manner, the receiving node is connected to the control node, and when acquiring the second dispersion spectrum, the receiving node receives the second dispersion spectrum sent by the control node.

[0023] In another optional implementation, the receiving node does not obtain the second dispersion spectrum through the control node, but obtains the second dispersion spectrum by itself. For example, when obtaining the second dispersion spectrum, the receiving node first obtains the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0024] Optionally, the receiving node is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with the plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the receiving node obtains the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0025] It is understandable that the receiving node can obtain the dispersion spectrum of each fiber segment without using the fiber detection unit. For example, the receiving node receives the dispersion spectrum of each fiber segment input by the staff, or the receiving node receives the dispersion spectrum of each fiber segment sent by other nodes. Optionally, the fiber detection unit is an optical time domain reflectometer (OTDR).

[0026] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Before executing the above method, the receiving node needs to determine whether the number of filters in the optical fiber link is greater than the quantity threshold, and execute the above method only when the number of filters is greater than the quantity threshold.

[0027] Optionally, the above-mentioned quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200Gb / s (gigabits per second) and the modulation code type of the optical signal is a 16-quadrature amplitude modulation (QAM) code type, the quantity threshold is about 2; when the transmission rate of the optical signal is 200Gb / s and the modulation code type of the optical signal is quadrature phase shift keying (QPSK), the quantity threshold is about 4. In the present application, the above-mentioned quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0028] In a second aspect, the present application provides a dispersion acquisition method, the method comprising: after acquiring a first dispersion spectrum, the control node sends the first dispersion spectrum to the receiving node. The control node is connected to the receiving node, and the receiving node is connected to the sending node via an optical fiber link, the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each filter in the at least one filter is connected between two adjacent optical fiber segments; the optical signal is an optical signal sent from the sending node to the receiving node via the optical fiber link, and the first dispersion spectrum is the accumulated dispersion spectrum of the at least one filter.

[0029] The way in which the control node obtains the first dispersion spectrum refers to the way in which the receiving node obtains the first dispersion spectrum by itself in the first aspect. For example, when obtaining the first dispersion spectrum, the control node first obtains the dispersion spectrum of each filter in the at least one filter, and then determines the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0030] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the control node reads the dispersion spectrum of the first filter from the first filter. Optionally, in this case, the first filter is: WSS or AWG. The first filter is any filter in the at least one filter.

[0031] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the control node determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. Optionally, in this case, the first filter is ITL. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0032] Optionally, the at least one filter is all filters or part of filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of filters in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0033] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link.

[0034] For example, it is assumed that the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter in the optical fiber link, the optical fiber link includes a second filter and a third filter, and the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter. Optionally, the second filter is the filter with the largest average value of each dispersion value in the dispersion spectrum in the optical fiber link. For example, the second filter is ITL, and the third filter is WSS (or AWG). Then, the selected partial filters include the second filter and do not include the third filter. It can be seen that when the receiving node selects a partial filter in the optical fiber link, it will select the second filter with relatively large dispersion, and will not select the third filter with relatively small dispersion. In this way, in subsequent operations, the receiving node only compensates for the larger damage caused by the dispersion of the second filter in the optical signal, and does not compensate for the smaller damage caused by the dispersion of the third filter in the optical signal. This not only reduces the dispersion that the receiving node needs to compensate, but also ensures that the dispersion compensation effect is better.

[0035] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the method further includes: the control node obtains the second dispersion spectrum of the optical signal, and sends the second dispersion spectrum to the receiving node or the dispersion compensation unit. The receiving node or the dispersion compensation unit performs a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments. The receiving node is connected to the optical fiber link through the dispersion compensation unit.

[0036] There are various ways for the control node to obtain the second dispersion spectrum.

[0037] In an optional implementation, when acquiring the second dispersion spectrum, the control node first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0038] Optionally, the control node is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the control node obtains the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0039] It is understandable that the control node can obtain the dispersion spectrum of each fiber segment without using the fiber detection unit. For example, the control node receives the dispersion spectrum of each fiber segment input by the staff, or the control node receives the dispersion spectrum of each fiber segment sent by other nodes. Optionally, the fiber detection unit is: OTDR.

[0040] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Before executing the above method, the control node needs to determine whether the number of filters in the optical fiber link is greater than the quantity threshold, and execute the above method only when the number of filters is greater than the quantity threshold.

[0041] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0042] In a third aspect, the present application provides a dispersion acquisition method, the method comprising: after acquiring the second dispersion spectrum of the optical signal, the control node sends the second dispersion spectrum to the receiving node or the optical fiber detection unit. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments. The optical signal is an optical signal sent by the sending node to the receiving node through an optical fiber link. The control node is connected to the receiving node, and the receiving node is connected to the sending node through an optical fiber link, and the optical fiber link includes: multiple optical fiber segments and at least one filter, and each filter of the at least one filter is connected between two adjacent optical fiber segments.

[0043] There are various ways for the control node to obtain the second dispersion spectrum.

[0044] In an optional implementation, when acquiring the second dispersion spectrum, the control node first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0045] Optionally, the control node is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the control node obtains the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0046] It is understandable that the control node can obtain the dispersion spectrum of each fiber segment without using the fiber detection unit. For example, the control node receives the dispersion spectrum of each fiber segment input by the staff, or the control node receives the dispersion spectrum of each fiber segment sent by other nodes. Optionally, the fiber detection unit is: OTDR.

[0047] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Before executing the above method, the control node needs to determine whether the number of filters in the optical fiber link is greater than the quantity threshold, and execute the above method only when the number of filters is greater than the quantity threshold.

[0048] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0049] In a fourth aspect, the present application provides a dispersion compensation device, the dispersion compensation device belongs to a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link includes: a plurality of optical fiber segments and at least one filter, each of the at least one filter is connected between two adjacent optical fiber segments, and the dispersion compensation device includes: a receiving module, a first acquisition module and a first compensation module. The receiving module is used to receive an optical signal from the optical fiber link; the first acquisition module is used to acquire a first dispersion spectrum, the first dispersion spectrum is the accumulated dispersion spectrum of the at least one filter; the first compensation module is used to perform a first dispersion compensation on the optical signal according to the first dispersion spectrum.

[0050] There are various ways for the first acquisition module to acquire the first dispersion spectrum. For example, the first acquisition module is connected to the control node, and the first acquisition module acquires the first dispersion spectrum by receiving the first dispersion spectrum sent by the control node. For another example, the first acquisition module acquires the first dispersion spectrum by itself.

[0051] For example, the first acquisition module first acquires the dispersion spectrum of each filter in the at least one filter, and then determines the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0052] There are various ways for the first acquisition module to acquire the dispersion spectrum of the first filter. For example, the first acquisition module receives the dispersion spectrum of the first filter input by the user; for another example, the first acquisition module receives the dispersion spectrum of the first filter sent by other devices; for another example, the first acquisition module acquires the dispersion spectrum of the first filter by looking up a table, reading data, etc. The first filter is any filter among the at least one filter.

[0053] In addition, the first acquisition module acquires the dispersion spectra of different filters in the same or different ways, which is not limited in this application.

[0054] Optionally, when different filters correspond to different dispersion spectra, the dispersion spectrum of each filter is calibrated and stored in the filter. The first acquisition module reads the dispersion spectrum of the first filter from the first filter. For example, such filters are: WSS or AWG. Such filters are called first-class filters.

[0055] Optionally, when filters with the same parameters correspond to the same dispersion spectrum, the first acquisition module acquires the parameters of the first filter, and queries the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter according to the parameters of the first filter to obtain the dispersion spectrum of the first filter. The parameters of the first filter include: at least one of the type (model) of the first filter and the channel bandwidth of the first filter. Optionally, this type of filter is ITL, and this type of filter is called a second type filter.

[0056] It is understandable that at least one filter is the first type of filter mentioned above. Or, at least one filter is the second type of filter mentioned above. Or, a part of the at least one filter is the first type of filter, and another part of the filters is the second type of filter.

[0057] Optionally, the at least one filter is all filters or part of filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of filters in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0058] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link. The dispersion compensation device also includes a selection module for selecting the partial filter.

[0059] For example, it is assumed that the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter in the optical fiber link, the optical fiber link includes a second filter and a third filter, the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, and the second filter is the filter with the largest corresponding dispersion spectrum in the optical fiber link. For example, the second filter is ITL, and the third filter is WSS (or AWG). Then, the selected partial filters include the second filter and do not include the third filter. It can be seen that when the selection module selects the partial filters in the optical fiber link, the corresponding second filter with a relatively large dispersion spectrum will be selected, and the corresponding third filter with a relatively small dispersion spectrum will not be selected. In this way, in subsequent operations, the receiving node only compensates for the larger dispersion caused by the second filter in the optical signal, and does not compensate for the smaller dispersion caused by the third filter in the optical signal. This not only reduces the dispersion that needs to be compensated by the receiving node, but also ensures that the dispersion compensation effect is better.

[0060] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the dispersion compensation device also includes: a second acquisition module and a second compensation module. The second acquisition module is used to acquire a second dispersion spectrum of the optical signal, and the second compensation module is used to perform a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments.

[0061] Optionally, the second dispersion compensation and the first dispersion compensation are performed sequentially, or the first dispersion compensation and the second dispersion compensation are performed sequentially, which is not limited in the present application.

[0062] There are various ways for the second acquisition module to acquire the second dispersion spectrum.

[0063] In an optional implementation manner, the second acquisition module is connected to the control node, and when acquiring the second dispersion spectrum, the second acquisition module receives the second dispersion spectrum sent by the control node.

[0064] In another optional implementation, the second acquisition module does not acquire the second dispersion spectrum through the control node, but acquires the second dispersion spectrum by itself. For example, when acquiring the second dispersion spectrum, the second acquisition module first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0065] Optionally, the second acquisition module is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the second acquisition module acquires the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0066] It is understandable that the second acquisition module can acquire the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the second acquisition module receives the dispersion spectrum of each optical fiber segment input by the staff, or the second acquisition module receives the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0067] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Optionally, the dispersion compensation device also includes a judgment module for judging whether the number of filters in the optical fiber link is greater than the quantity threshold, and other modules in the dispersion compensation device except the judgment module are used to work when the number of filters is greater than the quantity threshold.

[0068] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0069] In a fifth aspect, the present application provides a dispersion spectrum acquisition device, the dispersion spectrum acquisition device belongs to a control node, the control node is connected to a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link includes: a plurality of optical fiber segments and at least one filter, each of the at least one filter is connected between two adjacent optical fiber segments, the dispersion spectrum acquisition device includes: a first acquisition module and a first sending module. The first acquisition module is used to acquire a first dispersion spectrum, the optical signal is an optical signal sent from the sending node to the receiving node via the optical fiber link, and the first dispersion spectrum is the accumulated dispersion spectrum of the at least one filter; the first sending module is used to send the first dispersion spectrum to the receiving node.

[0070] The way in which the first acquisition module acquires the first dispersion spectrum refers to the way in which the receiving node acquires the first dispersion spectrum by itself in the first aspect. For example, when acquiring the first dispersion spectrum, the first acquisition module first acquires the dispersion spectrum of each filter in the at least one filter, and then determines the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0071] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the first acquisition module reads the dispersion spectrum of the first filter from the first filter. Optionally, in this case, the first filter is: WSS or AWG. The first filter is any filter in the at least one filter.

[0072] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the first acquisition module determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. Optionally, in this case, the first filter is ITL. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0073] Optionally, the at least one filter is all filters or part of filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of filters in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0074] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link. The dispersion spectrum acquisition device also includes a selection module for selecting the partial filter.

[0075] For example, it is assumed that the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter in the optical fiber link, the optical fiber link includes a second filter and a third filter, the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, and the second filter is the filter with the largest corresponding dispersion spectrum in the optical fiber link. For example, the second filter is ITL, and the third filter is WSS (or AWG). Then, the selected partial filters include the second filter and do not include the third filter. It can be seen that when the selection module selects the partial filters in the optical fiber link, the corresponding second filter with a relatively large dispersion spectrum will be selected, and the corresponding third filter with a relatively small dispersion spectrum will not be selected. In this way, in subsequent operations, the receiving node only compensates for the larger dispersion caused by the second filter in the optical signal, and does not compensate for the smaller dispersion caused by the third filter in the optical signal. This not only reduces the dispersion that needs to be compensated by the receiving node, but also ensures that the dispersion compensation effect is better.

[0076] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the dispersion spectrum acquisition device also includes: a second acquisition module and a second sending module. The second acquisition module is used to acquire the second dispersion spectrum of the optical signal, and the second sending module is used to send the second dispersion spectrum to the receiving node or the dispersion compensation unit. The receiving node or the dispersion compensation unit performs a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments. The receiving node is connected to the optical fiber link through the dispersion compensation unit.

[0077] There are various ways for the second acquisition module to acquire the second dispersion spectrum.

[0078] In an optional implementation, when acquiring the second dispersion spectrum, the second acquisition module first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0079] Optionally, the second acquisition module is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the second acquisition module acquires the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0080] It is understandable that the second acquisition module can acquire the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the second acquisition module receives the dispersion spectrum of each optical fiber segment input by the staff, or the second acquisition module receives the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0081] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Optionally, the dispersion spectrum acquisition device also includes a judgment module for judging whether the number of filters in the optical fiber link is greater than the quantity threshold, and other modules in the dispersion compensation device except the judgment module are used to work when the number of filters is greater than the quantity threshold.

[0082] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0083] In a sixth aspect, the present application provides a dispersion spectrum acquisition device, the dispersion spectrum acquisition device comprising: a second acquisition module and a second sending module. The second acquisition module is used to acquire a second dispersion spectrum of an optical signal, and the second sending module is used to send the second dispersion spectrum to the receiving node or the optical fiber detection unit. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments. The optical signal is an optical signal sent by the sending node to the receiving node via an optical fiber link. The control node is connected to the receiving node, and the receiving node is connected to the sending node via an optical fiber link, and the optical fiber link comprises: multiple optical fiber segments and at least one filter, and each filter of the at least one filter is connected between two adjacent optical fiber segments.

[0084] There are various ways for the second acquisition module to acquire the second dispersion spectrum.

[0085] In an optional implementation, when acquiring the second dispersion spectrum, the second acquisition module first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0086] Optionally, the second acquisition module is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the second acquisition module acquires the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0087] It is understandable that the second acquisition module can acquire the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the second acquisition module receives the dispersion spectrum of each optical fiber segment input by the staff, or the second acquisition module receives the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0088] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Optionally, the dispersion spectrum acquisition device also includes a judgment module for judging whether the number of filters in the optical fiber link is greater than the quantity threshold, and other modules in the dispersion compensation device except the judgment module are used to work when the number of filters is greater than the quantity threshold.

[0089] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0090] In a seventh aspect, the present application provides a dispersion compensation device, which belongs to a receiving node, and the receiving node is connected to a sending node via an optical fiber link, and the optical fiber link includes: multiple optical fiber segments and at least one filter, each of the at least one filter is connected between two adjacent optical fiber segments, and the dispersion compensation device includes: a processor and a memory, and the memory stores a program, and the processor is used to execute the program stored in the memory to implement the dispersion compensation method described in any design in the first aspect.

[0091] In an eighth aspect, the present application provides a dispersion spectrum acquisition device, the dispersion spectrum acquisition device belongs to a control node, the control node is connected to a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each of the at least one filter is connected between two adjacent optical fiber segments, the dispersion spectrum acquisition device comprises: a processor and a memory, the memory stores a program, the processor is used to execute the program stored in the memory to implement any dispersion acquisition method described in the second aspect.

[0092] In a ninth aspect, the present application provides a chip, comprising a programmable logic circuit and / or program instructions; when the chip is running, it is used to implement the dispersion compensation method as described in any one of the first aspects, or, when the chip is running, it is used to implement the dispersion acquisition method as described in any one of the second or third aspects.

[0093] In a tenth aspect, the present application provides a computer-readable storage medium, wherein a computer program is stored in the storage medium; when the computer program is executed by a processor, the dispersion compensation method as described in any one of the designs in the first aspect is implemented; or, when the computer program is executed by a processor, the dispersion acquisition method as described in any one of the designs in the second aspect or the third aspect is implemented.

[0094] In the eleventh aspect, the present application provides a computer program product comprising instructions; when the computer program product is run on a computer, the computer executes the dispersion compensation method as described in any one of the designs in the first aspect; or, when the computer program product is run on a computer, the computer executes the dispersion compensation method as described in any one of the designs in the second aspect or the third aspect.

[0095] In a twelfth aspect, the present application provides an optical communication system, comprising: a sending node, a receiving node and an optical fiber link, wherein the receiving node is connected to the sending node via the optical fiber link, and the optical fiber link comprises: multiple optical fiber segments and at least one filter, each filter in the at least one filter is connected between two adjacent optical fiber segments; the receiving node is used to receive an optical signal from the optical fiber link; the receiving node is also used to obtain a first dispersion spectrum, which is an accumulated dispersion spectrum of the at least one filter; the receiving node is also used to perform a first dispersion compensation on the optical signal according to the first dispersion spectrum.

[0096] There are various ways for the receiving node to obtain the first dispersion spectrum.

[0097] In an optional implementation, the first dispersion spectrum is a dispersion spectrum obtained by the receiving node itself, and is not a dispersion spectrum sent by another node. The receiving node is used to obtain the dispersion spectrum of each filter in the at least one filter when obtaining the first dispersion spectrum, and determine the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0098] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the receiving node reads the dispersion spectrum of the first filter from the first filter. The first filter is any filter in the at least one filter.

[0099] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the receiving node determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0100] In another optional implementation, the receiving node obtains the first dispersion spectrum by receiving the first dispersion spectrum sent by the control node. In this case, the control node can obtain the first dispersion spectrum in a manner similar to the manner in which the receiving node obtains the first dispersion spectrum by itself.

[0101] For example, the control node is configured to obtain the dispersion spectrum of each filter in the at least one filter when obtaining the first dispersion spectrum, and determine the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0102] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the control node reads the dispersion spectrum of the first filter from the first filter. The first filter is any filter in the at least one filter.

[0103] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the control node determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0104] Optionally, the at least one filter is all filters or part of filters in the optical fiber link.

[0105] Exemplarily, the partial filters are selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link;

[0106] When the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter, if the optical fiber link includes a second filter and a third filter, and the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, then the selected partial filters include the second filter and do not include the third filter.

[0107] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the receiving node is also used to obtain a second dispersion spectrum of the optical signal, and perform a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments;

[0108] Optionally, the second dispersion compensation and the first dispersion compensation are performed sequentially, or the first dispersion compensation and the second dispersion compensation are performed sequentially, which is not limited in the present application.

[0109] There are various ways for the receiving node to obtain the second dispersion spectrum.

[0110] In an optional implementation, the receiving node does not obtain the second dispersion spectrum through the control node, but obtains the second dispersion spectrum by itself. For example, the receiving node is used to first obtain the dispersion spectrum of each fiber segment in the multiple fiber segments when obtaining the second dispersion spectrum, and then determine the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0111] Optionally, the receiving node is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with the plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the receiving node is used to obtain the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determine the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0112] It is understandable that the receiving node can obtain the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the receiving node is used to receive the dispersion spectrum of each optical fiber segment input by the staff, or the receiving node is used to receive the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0113] In another optional implementation, the receiving node is connected to the control node, and the receiving node is used to receive the second dispersion spectrum sent by the control node when acquiring the second dispersion spectrum. In this case, the control node can obtain the second dispersion spectrum in a manner that refers to the receiving node's method of acquiring the second dispersion spectrum by itself.

[0114] For example, the control node is used to first obtain the dispersion spectrum of each fiber segment in the multiple fiber segments when obtaining the second dispersion spectrum, and then determine the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0115] Optionally, the control node is connected to multiple optical fiber detection units, the multiple optical fiber detection units correspond one-to-one to the multiple optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the control node is used to obtain the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determine the dispersion spectrum of the first optical fiber segment based on the length and type of the first optical fiber segment.

[0116] It is understandable that the control node can obtain the dispersion spectrum of each optical fiber segment without going through the optical fiber detection unit. For example, the control node is used to receive the dispersion spectrum of each optical fiber segment input by the staff, or the control node is used to receive the dispersion spectrum of each optical fiber segment sent by other nodes.

[0117] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Before executing the above method, the receiving node needs to determine whether the number of filters in the optical fiber link is greater than the quantity threshold, and execute the above method only when the number of filters is greater than the quantity threshold.

[0118] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200 Gb / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0119] Optionally, the control node does not send the second dispersion spectrum to the receiving node, and the receiving node does not perform the second dispersion compensation based on the second dispersion spectrum. In addition, the receiving node is connected to the optical fiber link through a dispersion compensation unit, the control node sends the second dispersion spectrum to the dispersion compensation unit, and the dispersion compensation unit performs the second dispersion compensation based on the second dispersion spectrum.

[0120] For the effects of the second to twelfth aspects mentioned above, please refer to the effects of the corresponding designs in the first aspect, and this application will not go into details here. BRIEF DESCRIPTION OF THE DRAWINGS

[0121] Figure 1 A schematic diagram of an optical communication system provided for this application;

[0122] Figure 2 A schematic diagram of a receiver provided for this application;

[0123] Figure 3 A schematic diagram of an additional unit provided in the present application performing dispersion compensation;

[0124] Figure 4 A schematic diagram of the dispersion of an optical signal before and after dispersion compensation provided in the present application;

[0125] Figure 5 A schematic diagram of another optical communication system provided for this application;

[0126] Figure 6 A flow chart of a dispersion compensation method provided in this application;

[0127] Figure 7 A schematic diagram of another dispersion condition of an optical signal before and after dispersion compensation provided by the present application;

[0128] Figure 8 A schematic diagram of a dispersion compensation method for an optical communication system provided in the present application;

[0129] Fig. 9 A schematic diagram of another method for performing dispersion compensation in an optical communication system provided by the present application;

[0130] Fig.10 A schematic diagram of another method for performing dispersion compensation in an optical communication system provided by the present application;

[0131] Fig.11 A schematic diagram of another method for performing dispersion compensation in an optical communication system provided by the present application;

[0132] Fig.12 A schematic diagram of another method for performing dispersion compensation in an optical communication system provided by the present application;

[0133] Fig.13 A flow chart of another dispersion compensation method provided by the present application;

[0134] Fig.14 A flow chart of another dispersion compensation method provided by the present application;

[0135] Fig.15 A flow chart of another dispersion compensation method provided by the present application;

[0136] Fig.16 A schematic diagram of the structure of a dispersion compensation device provided in this application;

[0137] Fig.17 A schematic diagram of the structure of a dispersion spectrum acquisition device provided in this application;

[0138] Fig.18 A schematic diagram of the structure of another dispersion spectrum acquisition device provided in the present application;

[0139] Fig.19 A schematic diagram of the structure of a dispersion compensation device or a dispersion spectrum acquisition device provided in the present application. DETAILED DESCRIPTION

[0140] In order to make the principles and technical solutions of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0141] This application involves Figure 1 For the optical communication system shown, please refer to Figure 1 The optical communication system includes: a sending node 01, a receiving node 02 and an optical fiber link 03. The sending node 01 and the receiving node 02 are connected via the optical fiber link 03.

[0142] For each of the sending node 01 and the receiving node 02, the node is a device (such as an optical transport network (OTN) device, an optical line terminal (OLT) device, etc.) or a part of a device (such as a board, etc.). For example, the sending node 01 is a transmitter (Tx), and the receiving node 02 is a receiver (Rx), and the receiving node is also called an optical transform unit (OTU).

[0143] An exemplary structure of a receiver is as follows Figure 2 As shown, the receiver includes a receiving unit 021 (coherent receiving unit or intensity modulation direct detection receiving unit), an analog-to-digital converter (ADC) 022, an optical digital signal processor (oDSP) 023, etc. The optical fiber link 03, the receiving unit 021, the ADC 022, and the oDSP 023 are connected in sequence.

[0144] The sending node 01 can carry the data to be transmitted on the optical signal and send the optical signal to the optical fiber link 03. The receiving node 02 can receive the optical signal from the optical fiber link 03, and demodulate the received optical signal to obtain the data carried by the optical signal. In this way, the end-to-end (E2E) communication from the sending node 01 to the receiving node 02 is realized. The data carried by the optical signal is the data of any business, such as data center interconnection, cloud computing, 4K / 8K (two screen resolutions) high-definition video, and augmented reality (AR / virtual reality, VR) and other business data.

[0145] Optionally, the optical fiber can transmit data bidirectionally, and the sending node 01 also has the function of the receiving node 02 , and the receiving node 02 also has the function of the sending node 01 .

[0146] Please continue to refer to Figure 1 , the optical fiber link 03 includes a plurality of optical fiber segments 031, and a filter 032 connected between each two adjacent optical fiber segments. One optical fiber segment 031 is also called a span optical fiber segment 031, and a plurality of optical fiber segments 031 are called multi-span optical fiber segments 031. One or more filters 032 are connected between each two adjacent optical fiber segments. The plurality of optical fiber segments 031 are two optical fiber segments 031, three optical fiber segments 031, or more optical fiber segments 031. Therefore, the optical fiber link 03 includes one filter 032, two filters 032, or more filters 032. Figure 1 In the figure, the optical fiber link 03 including three optical fiber segments 031 and two filters 032 is taken as an example.

[0147] The optical fiber link 03 includes one or more filters 032. For example, the filter 032 in the optical fiber link 03 includes at least one filter selected from the group consisting of ITL, WSS, and AWG.

[0148] Optionally, the optical fiber link 03 further includes amplifiers (not shown in the drawings) connected to both ends of each optical fiber segment 031 , and the filter 032 is connected between the amplifiers between two adjacent optical fiber segments 031 .

[0149] Optionally, the optical fiber link 03 includes multiple switching nodes (not shown in the drawings), at least some of the filters 032 are in the switching nodes, or the filters 032 in the optical fiber link 03 are all outside the switching nodes. By way of example, the switching node is an optical switching node, and the optical switching node directly switches the optical signal. When switching optical signals, the optical switching node does not need to convert the optical signal into an electrical signal, then switch the electrical signal, and convert the switched electrical signal into an optical signal. Since the optical switching node can directly switch optical signals, the power consumption of the optical switching node is low. Optionally, the optical switching node is an optical add / drop multiplexer (OADM) node. Such as a fixed optical add / drop multiplexer (FOADM) node or a reconfigurable optical add / drop multiplexer (ROADM) node.

[0150] The optical signal sent by the sending node 01 is transmitted to the receiving node 02 after passing through the optical fiber link 03. However, the optical fiber link 03 has dispersion, and the optical signal will be damaged under the effect of the dispersion when it is transmitted on the optical fiber link 03, resulting in a large deviation of the optical signal received by the receiving node 02 relative to the optical signal sent by the sending node 01, affecting the communication between the sending node 01 and the receiving node 02.

[0151] With the rapid development of fifth generation mobile communication technology (5G), data center interconnection, cloud computing, 4K / 8K (two image resolutions) high-definition video, and augmented reality (AR) / virtual reality (VR) and other services, the capacity of optical communication networks has grown rapidly. In scenarios such as backbone networks, metropolitan area networks, and data center interconnect (DCI) networks, coherent optical communication technology has become mainstream. 100Gb / s to 1.2 terabytes per second (Tb / s) coherent optical systems have been commercialized, and 1.6Tb / s+ coherent optical systems are also under development in the industry. However, coherent optical communication is more sensitive to dispersion than intensity modulation direct detection optical communication, and the dispersion tolerance of optical signals is negatively correlated with the rate of optical signals. Therefore, as the transmission rate increases, the damage introduced by the dispersion of the optical fiber link to the optical signal will be aggravated.

[0152] In addition, some modulation codes of optical signals are also very sensitive to dispersion, and the damage to optical signals of these modulation codes is relatively serious.

[0153] Therefore, it is urgent to perform dispersion compensation on optical signals to compensate for the damage introduced into the optical signals by the dispersion of the optical fiber link.

[0154] Currently, if Figure 3 As shown, the receiving node 02 is connected to the optical fiber link 03 through the additional unit 11. The additional unit 11 can compensate for the damage introduced by the dispersion of the optical fiber segment 031 in the optical signal passing through. By way of example, the additional unit 11 includes: a control module 111, a first optical switch 112, a second optical switch 113 and a plurality of first compensation modules 114. Among them, the input end of the first optical switch 112 is connected to the optical fiber link 03, and the plurality of output ends of the first optical switch 112 are connected to one end of the plurality of first compensation modules 114 in a one-to-one correspondence; the other ends of the plurality of first compensation modules 114 are connected to the plurality of input ends of the second optical switch 113 in a one-to-one correspondence, and the output end of the second optical switch 113 is connected to the receiving node 02. The control module 111 connects the first optical switch 112, the second optical switch 113 and the plurality of first compensation modules 114 (the figure shows that one first compensation module is connected). The control module 111 can configure dispersion spectra for the plurality of first compensation modules 114 respectively, and determine the target first compensation module 114 among the plurality of first compensation modules 114. The control module 111 can also control the input end of the first optical switch 112 to be connected to the target output end, and control the target input end of the second optical switch 113 to be connected to the output end. The target output end and the target input end are both connected to the target first compensation module 114. In this way, the optical signal from the optical fiber link 03 is transmitted along the first optical switch 112, the target first compensation module 114, the second optical switch 113 and the receiving node 02. In addition, in the process of passing through the target first compensation module 114, the target first compensation module 114 compensates for the damage introduced by the dispersion of the optical fiber based on the configured dispersion spectrum.

[0155] However, in the optical fiber link 03, not only the optical fiber section 031 has dispersion (low-order dispersion), but also the filter 032 in the optical fiber link 03 has dispersion (high-order dispersion). Figure 3 In the illustrated method, only the damage introduced by the dispersion of the optical fiber segment 031 is compensated, but the damage introduced by the dispersion of the filter 032 cannot be compensated, which results in that the dispersion compensation effect of the optical signal is still poor.

[0156] For example, assume that a fiber link includes a fiber segment and multiple filters (ITL and WSS). Figure 4 As shown, assuming that the accumulated dispersion spectrum of the plurality of optical fiber segments 031 is represented by dispersion spectrum A, the dispersion spectrum of the ITL is represented by dispersion spectrum B, and the dispersion spectrum of the WSS is represented by dispersion spectrum C, Figure 3 The method shown is used to compensate for the damage introduced by the dispersion spectrum D in the optical signal. It can be seen that the dispersion of the optical fiber link includes the dispersion represented by the dispersion spectrum A + dispersion spectrum B + dispersion spectrum C, but Figure 3 The method shown only compensates for the damage introduced by the dispersion represented by the dispersion spectrum A, and does not compensate for the damage introduced by the dispersion represented by the dispersion spectrum B and the dispersion spectrum C. Therefore, after the above dispersion compensation, the optical signal still has a large dispersion-induced damage, and the dispersion is represented by the dispersion spectrum E. The horizontal axis of the dispersion spectrum (such as A, B, C, D, E above) is the wavelength, and the vertical axis is the dispersion value at the wavelength. The wavelength of the horizontal axis of the dispersion spectrum is the wavelength within the working band, and the dispersion spectrum is also called the in-band dispersion spectrum.

[0157] The present application provides a dispersion compensation method, which can compensate for the damage introduced by the dispersion of the filter in the optical fiber link in the optical signal. In this way, on the basis of compensating for the damage introduced by the dispersion of the optical fiber segment in the optical signal, if the damage introduced by the dispersion of the filter in the optical signal is also compensated, the dispersion compensation effect of the optical signal can be improved.

[0158] The following will be Figure 5 Taking the optical communication system shown in FIG. 1 as an example, the dispersion compensation method provided by the embodiment of the present application is described. Before describing the dispersion compensation method, the embodiment of the present application first describes Figure 5 The optical communication system shown in the figure is briefly introduced. Figure 5 ,exist Figure 1 On the basis of the optical communication system shown, the optical communication system further includes: a dispersion compensation unit 04 , a control node 05 , and a plurality of optical fiber detection units 06 corresponding to the plurality of optical fiber segments 031 one by one.

[0159] The receiving node 02 is connected to the optical fiber link 03 via a dispersion compensation unit 04. The dispersion compensation unit 04 includes a tunable dispersion compensator (TDC) or a wavelength selective switch (WSS) or other devices capable of compensating for the damage introduced by dispersion.

[0160] The control node 05 is a server, a network management platform or an interface board in the server, etc. The control node 05 is connected to the dispersion compensation unit 04 and the receiving node 02. The control node 05 is used to control the dispersion compensation unit 04 and the receiving node 02 to perform dispersion compensation on the optical signal.

[0161] The optical fiber detection unit 06 is a device such as an OTDR, and the optical fiber detection unit 06 can detect the length and type of a corresponding optical fiber segment 031. The control node 05 is also connected to the optical fiber detection unit 06, and the control node 05 determines the dispersion spectrum of the optical fiber segment 031 corresponding to the optical fiber detection unit 06 according to the length and type detected by the optical fiber detection unit 06. Optionally, the optical fiber detection unit 06 is arranged at the above-mentioned switching node.

[0162] Below, the embodiments of the present application will be combined with Figure 5 The optical communication system shown introduces the dispersion compensation method provided in the embodiment of the present application.

[0163] For example, Figure 6 A flow chart of a dispersion compensation method provided in an embodiment of the present application, the dispersion compensation method comprises Figure 5 The optical communication system shown is implemented. Figure 6 As shown, the dispersion compensation method includes the following contents.

[0164] S101. A control node obtains a dispersion spectrum of each filter in at least one filter in an optical fiber link.

[0165] The optical fiber link includes one or more filters, each of which is connected between two adjacent optical fiber segments. The at least one filter is a partial filter or all filters in the optical fiber link. In the embodiment of the present application, all filters are taken as an example. By way of example, the at least one filter in the optical fiber link includes WSS, AWG and ITL.

[0166] In S101, the control node needs to obtain the dispersion spectrum of each filter in the at least one filter, so as to subsequently obtain a first dispersion spectrum according to the dispersion spectra, and then compensate for the damage introduced by the dispersion of the at least one filter according to the first dispersion spectrum.

[0167] Taking the first filter as an example, the first filter is any filter in the at least one filter. There are various ways for the control node to obtain the dispersion spectrum of the first filter. For example, the control node receives the dispersion spectrum of the first filter input by the user; for another example, the control node receives the dispersion spectrum of the first filter sent by other devices; for another example, the control node obtains the dispersion spectrum of the first filter by looking up a table, reading data, etc.

[0168] In addition, the control node may obtain the dispersion spectra of different filters in the same or different ways, which is not limited in this application.

[0169] Optionally, when different filters correspond to different dispersion spectra, the dispersion spectrum of each filter is calibrated and stored in the filter. The control node reads the dispersion spectrum of the first filter from the first filter in S101. For example, the first filter is: WSS or AWG. This type of filter is called a first type filter. Optionally, the dispersion spectrum of the first filter is not stored in the first filter, but is stored in the control node, in which case the control node directly reads the dispersion spectrum of the first filter locally.

[0170] Optionally, in the case where filters with the same parameters correspond to the same dispersion spectrum, the control node obtains the parameters of the first filter in S101, and queries the correspondence between the parameters of the first filter and the dispersion spectrum of the first filter according to the parameters of the first filter, and obtains the dispersion spectrum of the first filter. For example, the control node reads the parameters of the first filter from the first filter. The parameters of the first filter include: at least one of the type (model) of the first filter and the channel bandwidth of the first filter. For example, the channel bandwidth of the filter is 50, 75, 100 gigahertz (GHz), etc. Optionally, the first filter is ITL. This type of filter is called a second type filter.

[0171] It is understandable that at least one filter is the first type of filter mentioned above. Or, at least one filter is the second type of filter mentioned above. Or, a part of the at least one filter is the first type of filter, and another part of the filters is the second type of filter.

[0172] S102: The control node determines a first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter, where the first dispersion spectrum is an accumulated dispersion spectrum of at least one filter in the optical fiber link.

[0173] After obtaining the dispersion spectrum of each filter in the at least one filter, the control node determines a first dispersion spectrum according to the dispersion spectra. For example, when the at least one filter includes one filter, the control node uses the dispersion spectrum of the filter as the first dispersion spectrum. When the at least one filter includes at least two filters, the control node adds the dispersion spectra of the at least two filters to obtain the first dispersion spectrum.

[0174] Optionally, S101 and S102 are not executed, but the control node determines the first dispersion spectrum by other methods different from S101 and S102, for example, the control node receives the first dispersion spectrum input by a staff member, or the control node receives the first dispersion spectrum sent by other nodes, or the control node estimates the first dispersion spectrum, etc.

[0175] S103: The control node obtains the dispersion spectrum of each optical fiber segment in the multiple optical fiber segments.

[0176] In the embodiment of the present application, the control node also needs to obtain the dispersion spectrum of each optical fiber segment.

[0177] Optionally, the control node is connected to multiple fiber detection units, and the multiple fiber detection units correspond to multiple fiber segments one by one. The fiber detection unit is used to detect the length and type of a corresponding fiber segment; taking the first fiber segment as an example, the first fiber segment is any fiber segment among the multiple fiber segments, and the control node obtains the length and type of the first fiber segment detected by the fiber detection unit corresponding to the first fiber segment. For example, the fiber detection unit sends the length and type detected by the fiber detection unit to the control node, or the control node reads the length and type detected by the fiber detection unit from the fiber detection unit. The control node can also determine the dispersion spectrum of the first fiber segment based on the length and type of the first fiber segment.

[0178] For example, different types of optical fibers have different unit dispersion spectra, and the same type of optical fibers have the same unit dispersion spectrum. The unit dispersion spectrum of an optical fiber of a type is the dispersion spectrum of the optical fiber per unit length. The control node queries the unit dispersion spectrum of the optical fiber of this type according to the type of the first optical fiber segment, and then the control node multiplies the unit dispersion spectrum by the length of the first optical fiber segment as the dispersion spectrum of the first optical fiber segment.

[0179] It is understandable that the control node can obtain the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the control node receives the dispersion spectrum of each optical fiber segment input by the staff, or the control node receives the dispersion spectrum of each optical fiber segment sent by other nodes.

[0180] S104. The control node determines a second dispersion spectrum according to the dispersion spectrum of each optical fiber segment in the multiple optical fiber segments; the second dispersion spectrum is an accumulated dispersion spectrum of the multiple optical fiber segments.

[0181] After obtaining the dispersion spectrum of each of the multiple optical fiber segments, the control node can add the dispersion spectra of the multiple optical fiber segments to obtain a second dispersion spectrum.

[0182] Optionally, S103 and S104 are not executed, but the control node determines the second dispersion spectrum by other methods different from S103 and S104, for example, the control node receives the second dispersion spectrum input by a staff member, or the control node receives the second dispersion spectrum sent by other nodes, or the control node estimates the second dispersion spectrum, etc.

[0183] S105. The control node sends a second dispersion spectrum to the dispersion compensation unit.

[0184] After obtaining the second dispersion spectrum, the control node can send the second dispersion spectrum to the dispersion compensation unit, so that the dispersion compensation unit performs second dispersion compensation on the passing optical signal according to the second dispersion spectrum in S106. In this way, the damage introduced into the optical signal by the dispersion of multiple optical fiber segments can be completely or substantially eliminated.

[0185] S106. The dispersion compensation unit performs second dispersion compensation on the passing optical signal according to the second dispersion spectrum.

[0186] Optionally, the dispersion compensation unit can directly process the optical signal to perform the second dispersion compensation on the optical signal, and during the processing, the conversion between the optical signal and the electrical signal is not involved. Alternatively, the dispersion compensation unit can convert the optical signal into an electrical signal, then perform the second dispersion compensation on the electrical signal, and then convert the electrical signal after the second dispersion compensation into an optical signal.

[0187] S107. The control node sends a first dispersion spectrum to the receiving node.

[0188] After obtaining the first dispersion spectrum, the control node can send the first dispersion spectrum to the receiving node, so that the receiving node performs first dispersion compensation on the optical signal received from the optical fiber link according to the first dispersion spectrum in S108. In this way, the damage introduced into the optical signal by the dispersion of at least one filter can be completely or substantially eliminated.

[0189] S108. The receiving node performs first dispersion compensation on an optical signal received from the optical fiber link according to the first dispersion spectrum.

[0190] Illustratively, the receiving node performs first dispersion compensation on the optical signal according to the following formula.

[0191] S o =S i *exp(-j*π*Z*λ 2 / c), where S i represents the optical signal before the first dispersion compensation, S o represents the optical signal after the first dispersion compensation. j is an imaginary unit; π is the circumference of a circle, Z represents the first dispersion spectrum, λ represents the wavelength of the optical signal, and c represents the speed of light.

[0192] Optionally, after the receiving node performs the first dispersion compensation on the optical signal according to the above formula, the receiving node further detects in S108 whether the dispersion compensation effect of the optical signal reaches the expected effect. If the dispersion compensation effect of the optical signal does not reach the expected effect, the receiving node continues to periodically perform the third dispersion compensation on the optical signal based on the third dispersion spectrum until the dispersion compensation effect of the optical signal reaches the expected effect. The third dispersion spectrum is a pre-set dispersion spectrum, and the dispersion value in the third dispersion spectrum is usually small. For example, the dispersion value of any wavelength in the third dispersion spectrum is less than the dispersion value of the wavelength in the first dispersion spectrum, and less than the dispersion value of the wavelength in the second dispersion spectrum. The third dispersion compensation based on the third dispersion spectrum can fine-tune the dispersion compensation effect of the optical signal.

[0193] In the case where the third dispersion compensation is not required, the speed of the entire dispersion compensation is faster and more efficient, and the power consumption of the receiving node is lower. In the case where the third dispersion compensation is required, since the first dispersion compensation and the second dispersion compensation have already compensated for most of the dispersion in the optical signal, the number of times the third dispersion compensation is performed is usually less, so the speed of the entire dispersion compensation is also faster and more efficient, and the power consumption of the receiving node is also lower.

[0194] Optionally, at least part of the operations performed by the receiving node in the embodiment of the present application are performed by the oDSP in the receiving node. Optionally, the oDSP is also used to compensate for the frequency deviation or phase of the optical signal, and to perform forward error correction (FEC) decoding on the optical signal. In addition, Figure 2 As shown, the receiver further includes a receiving unit and an ADC, wherein the receiving unit is used to convert the optical signal from the optical fiber link into an electrical signal, the ADC is used to convert the electrical signal from an analog signal into a digital signal, and the oDSP is used to perform a first dispersion compensation on the digital signal. The compensation accuracy of the dispersion compensation performed by the oDSP is usually high.

[0195] After the receiving node completes dispersion compensation for the optical signal, it extracts the data carried by the optical signal.

[0196] In addition, the operation of the receiving node receiving the optical signal is performed before or after the receiving node obtains the first dispersion spectrum, which is not limited in the embodiment of the present application.

[0197] In summary, the dispersion compensation method provided by the present application enables the receiving node to compensate for the damage introduced by the accumulated dispersion of at least one filter in the optical fiber link in the optical signal. In this way, on the basis of compensating for the damage introduced by the accumulated dispersion of the optical fiber in the optical signal, if the damage introduced by the accumulated dispersion of at least one filter in the optical signal is also compensated, the dispersion compensation effect of the optical signal can be improved.

[0198] For example, it is assumed that the optical fiber link includes an optical fiber, an ITL, and a WSS. Figure 7As shown, it is assumed that the dispersion of the optical fiber segment 031 is represented by dispersion spectrum A, the dispersion of the ITL is represented by dispersion spectrum B, and the dispersion of the WSS is represented by dispersion spectrum C. The dispersion compensated by the first dispersion compensation is represented by dispersion spectra F and G, wherein the dispersion represented by dispersion spectrum F is used to compensate for the dispersion of the ITL, and the dispersion represented by dispersion spectrum G is used to compensate for the dispersion of the WSS. The dispersion compensated by the second dispersion compensation in the embodiment of the present application is represented by dispersion spectrum H. It can be seen that the dispersion of the optical fiber link includes the dispersion represented by dispersion spectrum A+dispersion spectrum B+dispersion spectrum C, the first dispersion compensation in the present application compensates for the dispersion represented by dispersion spectra B and C, and the second dispersion compensation compensates for the dispersion represented by dispersion spectrum A. The optical signal passes through the second dispersion compensation and the first dispersion compensation in sequence. After the second dispersion compensation, the optical signal has dispersion-induced damage represented by dispersion spectrum I, and after the first dispersion compensation, the optical signal has dispersion-induced damage represented by dispersion spectrum J. Figure 7 It can be seen that after the first dispersion compensation and the second dispersion compensation described above, there is almost no damage in the optical signal caused by the dispersion of the optical fiber link.

[0199] In addition, since the embodiments of the present application can compensate for the damage introduced by the dispersion of the filter, the requirements for the dispersion specifications of the filter can be reduced, thereby further improving the yield of the filter and reducing the cost of the optical fiber link where the filter is located. Moreover, the present application uses the calibrated dispersion spectrum and the optical fiber detection unit already deployed in the existing network to obtain the first dispersion spectrum and the second dispersion spectrum without the need for a complex dispersion detection solution and additional hardware configuration.

[0200] The sequence of steps of the method embodiments provided in the embodiments of the present application can be appropriately adjusted, and the steps can be increased or decreased accordingly according to the circumstances. Any technician familiar with the technical field can easily think of the changed methods within the technical scope disclosed in the present application, and they should be included in the protection scope of the present application, so they will not be repeated here.

[0201] Optionally, at least one of the above S101 and S102 is not performed by the control node, but by the receiving node. The process of the receiving node performing S101 refers to the process of the control node performing S101, and the process of the receiving node performing S102 refers to the process of the control node performing S102, which is not described in detail in this application. In the case where S102 is performed by the receiving node, the dispersion compensation method provided by this application does not include S107. When one of the operations in S101 and S102 is performed by the control node and the other operation is performed by the receiving node, before S102, the node performing S101 needs to send the dispersion spectrum of each filter in at least one filter to the node performing S102.

[0202] Optionally, at least one of S103 and S104 is not executed by the control node, but by the receiving node. The process of the receiving node executing S103 refers to the process of the control node executing S103, and the process of the receiving node executing S104 refers to the process of the control node executing S104, which is not described in detail in this application. In this case, in S105, the receiving node sends the second dispersion spectrum to the dispersion compensation unit. When one of S103 and S104 is executed by the control node and the other operation is executed by the receiving node, before S104, the node executing S103 needs to send the dispersion spectrum corresponding to each optical fiber segment to the node executing S104.

[0203] Optionally, in S105, the second dispersion spectrum is not sent to the dispersion compensation unit, and in S106, the dispersion compensation unit does not perform the second dispersion compensation on the passing optical signal according to the second dispersion spectrum. For example, in S105, the second dispersion spectrum is sent to the receiving node, and the receiving node performs the second dispersion compensation on the received optical signal according to the second dispersion spectrum in S106. In addition, when S104 is performed by the receiving node, the dispersion compensation method does not include S105.

[0204] When the receiving node needs to perform the first dispersion compensation and the second dispersion compensation, the resources and power consumption of the receiving node are both large. When the receiving node needs to perform the first dispersion compensation and does not need to perform the second dispersion compensation, the resources and power consumption of the receiving node are both small.

[0205] In addition, in some of the above embodiments, the dispersion compensation method does not involve a dispersion compensation unit, and the optical communication system may not include the above dispersion compensation unit, so that the loss of the optical signal on the dispersion compensation unit can be avoided, and the performance of the optical signal received by the receiving node (such as optical signal to noise ratio (OSNR) performance) can be improved. In some of the above embodiments, the dispersion compensation method does not involve a control node, and the optical communication system may not include a control node.

[0206] The following is explained through several examples.

[0207] Example 1: The control node executes S101 to S104, and sends the second dispersion spectrum to the dispersion compensation unit in S105, and sends the first dispersion spectrum to the receiving node in S107. The dispersion compensation unit executes S106, and the receiving node executes S108.

[0208] like Figure 8As shown, it is assumed that the at least one filter includes four filters on the optical fiber link. When the control node executes S101, it reads the dispersion spectrum of the filter from a filter in each switching node. The control node also reads the parameters of the filter (such as type, channel bandwidth) from another filter in each switching node, and queries the corresponding relationship between the parameters of the filter and the dispersion spectrum of the filter according to the parameters of the filter to obtain the dispersion spectrum of the filter. In this way, the control node obtains the dispersion spectrum of each filter in S101. When the control node executes S102, it obtains the first dispersion spectrum (the accumulated dispersion spectrum of the four filters) according to the dispersion spectra of the four filters.

[0209] When executing S103, the control node obtains the length and type of the optical fiber segment corresponding to the optical fiber detection unit through the optical fiber detection unit, and then obtains the dispersion spectrum of the optical fiber segment according to the length and type. Figure 8 Only one optical fiber detection unit is shown in FIG. After obtaining the dispersion spectra of each optical fiber segment, the control node can obtain a second dispersion spectrum (the accumulated dispersion spectrum of the multiple optical fiber segments) according to the dispersion spectra of these optical fiber segments when executing S104.

[0210] When executing S105, the control node sends the second dispersion spectrum to the dispersion compensation unit. When executing S107, the control node sends the first dispersion spectrum to the receiving node (such as the oDSP in the receiving node).

[0211] The optical signal sent by the sending node 01 is transmitted to the receiving node 02 after passing through the optical fiber link and the dispersion compensation unit 04. Moreover, when the dispersion compensation unit 04 executes S106, the second dispersion compensation is performed on the optical signal passing through according to the second dispersion spectrum. When the receiving node 02 executes S108, the receiving unit 021 in the receiving node 02 first converts the received optical signal into an electrical signal; then, the ADC 022 in the receiving node 02 converts the electrical signal from an analog signal into a digital signal; finally, the oDSP 023 in the receiving node 02 performs the first dispersion compensation on the digital signal according to the first dispersion spectrum. After that, the oDSP 023 also compensates for the frequency deviation or phase of the optical signal, and performs FEC decoding on the optical signal. By way of example, the oDSP 023 includes: a chromatic dispersion compensation (CDC) module, a frequency deviation or phase compensation module, and an FEC decoding module. The CDC module is used to perform the first dispersion compensation, the frequency offset or phase compensation module is used to compensate for the frequency offset or phase of the optical signal, and the FEC decoding module is used to perform FEC decoding on the optical signal.

[0212] Example 2: The control node executes S101 to S104, and sends the second dispersion spectrum to the receiving node in S105, and sends the first dispersion spectrum to the receiving node in S107. The receiving node executes S106 and S108.

[0213] like Fig. 9 As shown, in Figure 8 On the basis of, when executing S105, the control node 05 does not send the second dispersion spectrum to the dispersion compensation unit 04, but sends it to the receiving node 02 (such as the oDSP 023 in the receiving node 02). In this way, the above S106 is executed by the receiving node 02. In this case, Fig. 9 The optical communication system shown does not include the dispersion compensation unit 04. It is understood that Fig. 9 The optical communication system shown may also include a dispersion compensation unit 04, which is not limited in the embodiment of the present application.

[0214] Example 3: The control node executes S103 to S104, and sends the second dispersion spectrum to the dispersion compensation unit in S105. The dispersion compensation unit executes S106. The first dispersion spectrum is written into the receiving node by the staff, and the receiving node executes S108 based on the first dispersion spectrum. The dispersion compensation method does not include S107.

[0215] like Fig.10 As shown, in Figure 8 On the basis of, neither the control node 05 nor the receiving node 02 executes S101 and S102. The receiving node 02 receives the first dispersion spectrum input by the staff before executing S108, and when executing S108, performs the first dispersion compensation on the optical signal according to the first dispersion spectrum. In addition, since the first dispersion spectrum is written into the receiving node 02 by the staff, the control node 05 does not need to execute S107 to send the first dispersion spectrum to the receiving node 02.

[0216] Example 4: The control node executes S103 to S104, and sends the second dispersion spectrum to the receiving node in S105. The receiving node executes S101 to S102, S106, and S108. The dispersion compensation method does not include S107.

[0217] like Fig.11 As shown, in Fig. 9 On the basis of, neither the control node 05 nor the receiving node 02 executes S101 and S102. The receiving node 02 receives the first dispersion spectrum input by the staff before executing S108, and when executing S108, performs the first dispersion compensation on the optical signal according to the first dispersion spectrum. In addition, since the first dispersion spectrum is written into the receiving node 02 by the staff, the control node 05 does not need to execute S107 to send the first dispersion spectrum to the receiving node 02.

[0218] Example 5: The receiving node receives a first dispersion spectrum input by a staff member, and estimates a second dispersion spectrum. The receiving node also performs S106 according to the second dispersion spectrum, and performs S108 according to the first dispersion spectrum. The dispersion compensation method does not include S101 to S105 and S107.

[0219] like Fig.12 As shown, in Fig.11 On the basis of the second dispersion spectrum, the second dispersion spectrum is estimated by the receiving node 02, rather than provided by the control node 05. In this case, the control node 05 does not need to obtain the second dispersion spectrum, and send the second dispersion spectrum to the receiving node 02. Optionally, in this case, the optical communication system does not include the control node and the optical fiber detection unit.

[0220] Optionally, in the solutions shown in Examples 1 and 2 above, the switching node is an OADM node, such as a ROADM or FOADM node. In the solutions shown in Examples 3, 4 and 5 above, the switching node is a FOADM node.

[0221] According to the above embodiments, the control node can send the second dispersion spectrum to the dispersion compensation unit or the receiving node. Optionally, the control node sends the second dispersion spectrum to the dispersion compensation unit or the receiving node by default. Optionally again, the control node determines whether the second dispersion spectrum is sent to the dispersion compensation unit or the receiving node by judging whether the optical communication system includes a dispersion compensation unit. For example, after acquiring the second dispersion spectrum, the control node determines whether the optical communication system includes a dispersion compensation unit. When the optical communication system includes a dispersion compensation unit, the control node sends the second dispersion spectrum to the dispersion compensation unit so that the dispersion compensation unit performs a second dispersion compensation on the passing optical signal according to the second dispersion spectrum. When the optical communication system does not include a dispersion compensation unit, the control node sends the second dispersion spectrum to the receiving node so that the receiving node performs a second dispersion compensation on the passing optical signal according to the second dispersion spectrum.

[0222] For example, similar to the above examples 1 and 2, when the control node obtains the first dispersion spectrum and the second dispersion spectrum, if the control node determines whether the optical communication system includes a dispersion compensation unit to send the second dispersion spectrum to the dispersion compensation unit or the receiving node, then the dispersion compensation method for executing the optical communication system is as follows: Fig.13 shown.

[0223] As another example, similar to the above examples 3 and 4, when the control node obtains the second dispersion spectrum and the staff writes the first dispersion spectrum to the receiving node, if the control node determines whether the optical communication system includes a dispersion compensation unit to send the second dispersion spectrum to the dispersion compensation unit or the receiving node, then the dispersion compensation method for executing the optical communication system is as follows: Fig.14 shown.

[0224] In addition, when the receiving node estimates the second dispersion spectrum and the staff writes the first dispersion spectrum to the receiving node, since the control node does not need to send the second dispersion spectrum to the dispersion compensation unit or the receiving node, the control node does not need to determine whether the optical communication system includes a dispersion compensation unit. For example, the dispersion compensation method performed by the optical communication system in Example 5 is as follows: Fig.15 shown.

[0225] Furthermore, in the above embodiment, the at least one filter in S101 is taken as an example of all filters in the optical fiber link. Optionally, the at least one filter is not all filters in the optical fiber link, but part of the filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and a comb filter ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of the filters in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0226] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link.

[0227] The control node or the receiving node can select some filters in the optical fiber link as the at least one filter according to the modulation code type of the optical signal transmitted between the sending node and the receiving node. Alternatively, the control node or the receiving node can select some filters in the optical fiber link as the at least one filter according to the dispersion spectrum of each filter in the optical fiber link. Alternatively, the control node or the receiving node can select some filters in the optical fiber link as the at least one filter according to the modulation code type of the optical signal and the dispersion spectrum of each filter in the optical fiber link.

[0228] For example, it is assumed that the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter in the optical fiber link, and the optical fiber link includes a second filter and a third filter. The average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, for example, the second filter is the filter with the largest average value in the optical fiber link. Alternatively, the maximum dispersion value in the dispersion spectrum of the second filter is greater than the maximum dispersion value in the dispersion spectrum of the third filter, for example, the second filter is the filter with the largest maximum dispersion value in the optical fiber link; or, the median of the dispersion value of the dispersion spectrum of the second filter is greater than the median of the dispersion value of the dispersion spectrum of the third filter, for example, the second filter is the filter with the largest median in the optical fiber link. In the embodiment of the present application, the second filter is taken as ITL and the third filter is taken as WSS (or AWG) as an example.

[0229] When the optical fiber link includes the second filter and the third filter, the selected partial filter includes the second filter and does not include the third filter. It can be seen that when the control node or the receiving node selects partial filters in the optical fiber link, it will select the second filter with relatively large dispersion, but will not select the third filter with relatively small dispersion. In this way, in subsequent operations, the receiving node only compensates for the larger damage caused by the dispersion of the second filter in the optical signal, but does not compensate for the smaller damage caused by the dispersion of the third filter in the optical signal. This not only reduces the dispersion that needs to be compensated by the receiving node, but also ensures a better dispersion compensation effect.

[0230] As another example, assuming that the basis for selecting some filters includes the modulation code type of the optical signal, since different modulation code types have different sensitivities to dispersion, for optical signals of different modulation code types, the control node or the receiving node selects filters of different proportions as the above-mentioned partial filters. For example, when the modulation code type of the optical signal is the first modulation code type, the control node or the receiving node selects filters of the first proportion (such as 90%, 85%, etc.) in the optical fiber link as the above-mentioned partial filters; for another example, when the modulation code type of the optical signal is the second modulation code type, the control node or the receiving node selects filters of the second proportion (less than the first proportion, such as the second proportion is 80%, 75%, etc.) in the optical fiber link as the above-mentioned partial filters. Among them, the sensitivity of the first modulation code type to dispersion is higher than the sensitivity of the second modulation code type to dispersion. The higher the sensitivity of the modulation code type of the optical signal to dispersion, the greater the damage introduced by the dispersion in the optical signal.

[0231] As another example, assuming that the basis for selecting the above-mentioned partial filters includes the modulation code type of the optical signal and the dispersion spectrum of each filter in the optical fiber link, the control node or the receiving node first selects a certain proportion of filters in the optical fiber link according to the modulation code type of the optical signal; then, according to the dispersion spectrum of the selected filters, the above-mentioned partial filters are selected from these filters as the above-mentioned at least one filter. Alternatively, the control node or the receiving node first selects a part of the filters in the optical fiber link according to the dispersion spectrum of each filter, and then, according to the modulation code type of the optical signal, selects a certain proportion of filters from these part of the filters as the above-mentioned at least one filter.

[0232] Optionally, the above embodiment takes the second dispersion compensation and the first dispersion compensation as an example. Optionally, the first dispersion compensation and the second dispersion compensation are performed in sequence, which is not limited in the embodiment of the present application.

[0233] Optionally, the number of filters in the above optical fiber link is greater than a number threshold, and the number threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the number threshold, the optical communication system uses the dispersion compensation method provided in the above embodiment to perform the first dispersion compensation (or the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the number threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system.

[0234] Optionally, before executing the above method, at least one of the receiving node and the control node needs to determine whether the number of filters in the optical fiber link is greater than the number threshold, and execute the above method only when the number of filters is greater than the number threshold.

[0235] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is 16QAM code type, the quantity threshold is about 2; when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is QPSK code type, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0236] Combined with the above Figures 1 to 12, describes in detail the method provided by the embodiment of the present application. In order to implement the functions described in the above methods, the node must include hardware and / or software modules corresponding to the execution of each function. In combination with the execution process of each method described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in combination with the embodiments, but such implementation should not be considered to exceed the scope of the embodiments of the present application.

[0237] This embodiment can divide the functional modules of the corresponding device according to the above method embodiment, for example, divide each functional module corresponding to each function, and integrate two or more functions into one processing module. The above integrated module can be implemented in the form of hardware. The division of modules in this embodiment is schematic, specifically as a possible division method of logical functions, and there can be other division methods in actual implementation.

[0238] When the functional module division method is adopted, the following will be combined Fig.16 , Fig.17 and Fig.18 Describe the device provided by the embodiment of the present application.

[0239] For example, Fig.16 A schematic diagram of the structure of a dispersion compensation device provided in an embodiment of the present application, wherein the dispersion compensation device belongs to the receiving node (such as Figure 5 In the receiving node 02), optionally, the dispersion compensation device belongs to the oDSP in the receiving node. Fig.16 As shown, the dispersion compensation device includes: a receiving module 802, a first acquisition module 801 and a first compensation module 803. The first acquisition module 801 is used to acquire a first dispersion spectrum, which is the accumulated dispersion spectrum of the at least one filter; the receiving module 802 is used to receive an optical signal from the optical fiber link; the first compensation module 803 is used to perform a first dispersion compensation on the optical signal according to the first dispersion spectrum. The operation performed by the first acquisition module 801 refers to the way in which the receiving node acquires the first dispersion spectrum in the aforementioned method embodiment, and the operation performed by the first compensation module 803 refers to S108 in the aforementioned embodiment.

[0240] There are various ways for the first acquisition module 801 to acquire the first dispersion spectrum. For example, the first acquisition module 801 is connected to the control node, and the first acquisition module 801 acquires the first dispersion spectrum by receiving the first dispersion spectrum sent by the control node. For another example, the first acquisition module 801 acquires the first dispersion spectrum by itself.

[0241] Illustratively, the first acquisition module 801 first acquires the dispersion spectrum of each filter in the at least one filter, and then determines the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0242] There are various ways for the first acquisition module 801 to acquire the dispersion spectrum of the first filter. For example, the first acquisition module 801 receives the dispersion spectrum of the first filter input by the user; for another example, the first acquisition module 801 receives the dispersion spectrum of the first filter sent by other devices; for another example, the first acquisition module acquires the dispersion spectrum of the first filter by looking up a table, reading data, etc. The first filter is any filter among the at least one filter.

[0243] In addition, the first acquisition module 801 acquires the dispersion spectra of different filters in the same or different manners, which is not limited in the present application.

[0244] Optionally, when different filters correspond to different dispersion spectra, the dispersion spectrum of each filter is calibrated and stored in the filter. The first acquisition module 801 reads the dispersion spectrum of the first filter from the first filter. For example, such filters are: WSS or AWG. Such filters are called first-class filters.

[0245] Optionally, when filters with the same parameters correspond to the same dispersion spectrum, the first acquisition module 801 acquires the parameters of the first filter, and queries the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter according to the parameters of the first filter to obtain the dispersion spectrum of the first filter. The parameters of the first filter include: at least one of the type (model) of the first filter and the channel bandwidth of the first filter. Optionally, this type of filter is ITL, and this type of filter is called a second type filter.

[0246] It is understandable that at least one filter is the first type of filter mentioned above. Or, at least one filter is the second type of filter mentioned above. Or, a part of the at least one filter is the first type of filter, and another part of the filters is the second type of filter.

[0247] Optionally, the at least one filter is all filters or part of filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of filters in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0248] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link. The dispersion compensation device also includes a selection module ( Fig.16 not shown).

[0249] For example, it is assumed that the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter in the optical fiber link, the optical fiber link includes a second filter and a third filter, the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, and the second filter is the filter with the largest corresponding dispersion spectrum in the optical fiber link. For example, the second filter is ITL, and the third filter is WSS (or AWG). Then, the selected partial filters include the second filter and do not include the third filter. It can be seen that when the selection module selects the partial filters in the optical fiber link, the second filter with relatively large dispersion will be selected, and the third filter with relatively small dispersion will not be selected. In this way, in subsequent operations, the receiving node only compensates for the larger damage caused by the dispersion of the second filter in the optical signal, and does not compensate for the smaller damage caused by the dispersion of the third filter in the optical signal. This not only reduces the dispersion that needs to be compensated by the receiving node, but also ensures that the dispersion compensation effect is better.

[0250] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the dispersion compensation device also includes: a second acquisition module and a second compensation module ( Fig.16 The second acquisition module is used to acquire a second dispersion spectrum of the optical signal, and the second compensation module is used to perform a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments.

[0251] Optionally, the second dispersion compensation and the first dispersion compensation are performed sequentially, or the first dispersion compensation and the second dispersion compensation are performed sequentially, which is not limited in the present application.

[0252] There are various ways for the second acquisition module to acquire the second dispersion spectrum.

[0253] In an optional implementation manner, the second acquisition module is connected to the control node, and when acquiring the second dispersion spectrum, the second acquisition module receives the second dispersion spectrum sent by the control node.

[0254] In another optional implementation, the second acquisition module does not acquire the second dispersion spectrum through the control node, but acquires the second dispersion spectrum by itself. For example, when acquiring the second dispersion spectrum, the second acquisition module first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0255] Optionally, the second acquisition module is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the second acquisition module acquires the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0256] It is understandable that the second acquisition module can acquire the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the second acquisition module receives the dispersion spectrum of each optical fiber segment input by the staff, or the second acquisition module receives the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0257] Optionally, the number of filters in the above optical fiber link is greater than a number threshold, and the number threshold is greater than 1. It can be seen that the optical communication system performs the first dispersion compensation (or the first dispersion compensation and the second dispersion compensation) on the optical signal only when the number of filters in the optical fiber link is greater than the number threshold. When the number of filters in the optical fiber link is less than or equal to the number threshold, the optical communication system does not need to perform dispersion compensation on the optical signal because the damage introduced by the dispersion of the filter in the optical signal is less at this time. In this way, the power consumption of each part of the optical communication system is reduced. Optionally, the dispersion compensation device also includes a judgment module ( Fig.16 (not shown) is used to determine whether the number of filters in the optical fiber link is greater than the number threshold, and other modules in the dispersion compensation device except the judgment module are used to work when the number of filters is greater than the number threshold.

[0258] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0259] For example, Fig.17A schematic diagram of the structure of another dispersion compensation device provided in an embodiment of the present application, wherein the dispersion compensation device belongs to the control node (such as Figure 5 The control node 05 in Fig.17 As shown, the dispersion compensation device includes: a first acquisition module 901 and a first sending module 902. The first acquisition module 901 is used to acquire a first dispersion spectrum, which is an accumulated dispersion spectrum of the at least one filter; the first sending module 902 is used to send the first dispersion spectrum to the receiving node. The operations performed by the first acquisition module 901 refer to S101 and S102 in the above-mentioned embodiment, and the operations performed by the first sending module 902 refer to S107 in the above-mentioned embodiment.

[0260] The way in which the first acquisition module 901 acquires the first dispersion spectrum refers to the way in which the receiving node acquires the first dispersion spectrum by itself in the aforementioned method embodiment. For example, when acquiring the first dispersion spectrum, the first acquisition module 901 first acquires the dispersion spectrum of each filter in the at least one filter, and then determines the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0261] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the first acquisition module 901 reads the dispersion spectrum of the first filter from the first filter. Optionally, in this case, the first filter is: WSS or AWG. The first filter is any filter in the at least one filter.

[0262] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the first acquisition module 901 determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. Optionally, in this case, the first filter is ITL. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0263] Optionally, the at least one filter is all filters or part of filters in the optical fiber link. For example, the filters in the optical fiber link include at least one of WSS and AWG, and ITL; the at least one filter includes ITL, but does not include WSS and AWG. In the case where the at least one filter is a part of filters in the optical fiber link, the dispersion value in the first dispersion spectrum is small, the dispersion compensated by the first dispersion compensation performed by the receiving node is small, and the efficiency of the first dispersion compensation is high.

[0264] Optionally, when the at least one filter is a partial filter in the optical fiber link, the partial filter is a filter selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link. The dispersion spectrum acquisition device also includes a selection module ( Fig.17 not shown).

[0265] For example, it is assumed that the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter in the optical fiber link, the optical fiber link includes a second filter and a third filter, the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, and the second filter is the filter with the largest corresponding dispersion spectrum in the optical fiber link. For example, the second filter is ITL, and the third filter is WSS (or AWG). Then, the selected partial filters include the second filter and do not include the third filter. It can be seen that when the selection module selects the partial filters in the optical fiber link, the second filter with relatively large dispersion will be selected, and the third filter with relatively small dispersion will not be selected. In this way, in subsequent operations, the receiving node only compensates for the larger damage caused by the dispersion of the second filter in the optical signal, and does not compensate for the smaller damage caused by the dispersion of the third filter in the optical signal. This not only reduces the dispersion that needs to be compensated by the receiving node, but also ensures that the dispersion compensation effect is better.

[0266] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the dispersion spectrum acquisition device also includes: a second acquisition module and a second sending module ( Fig.17 The second acquisition module is used to acquire the second dispersion spectrum of the optical signal, and the second sending module is used to send the second dispersion spectrum to the receiving node or the dispersion compensation unit. The receiving node or the dispersion compensation unit performs the second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments. The receiving node is connected to the optical fiber link through the dispersion compensation unit. For the operations performed by the second acquisition module, please refer to the process of controlling the node to acquire the second dispersion spectrum in the aforementioned method embodiment, and for the operations performed by the second sending module, please refer to the process of controlling the node to send the second dispersion spectrum to the receiving node or the dispersion compensation unit in the aforementioned embodiment.

[0267] There are various ways for the second acquisition module to acquire the second dispersion spectrum.

[0268] In an optional implementation, when acquiring the second dispersion spectrum, the second acquisition module first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0269] Optionally, the second acquisition module is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one to one with a plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the second acquisition module acquires the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determines the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0270] It is understandable that the second acquisition module can acquire the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the second acquisition module receives the dispersion spectrum of each optical fiber segment input by the staff, or the second acquisition module receives the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0271] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Optionally, the dispersion spectrum acquisition device also includes a judgment module for judging whether the number of filters in the optical fiber link is greater than the quantity threshold, and other modules in the dispersion compensation device except the judgment module are used to work when the number of filters is greater than the quantity threshold.

[0272] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0273] For example, Fig.18 A schematic diagram of the structure of another dispersion compensation device provided in an embodiment of the present application, wherein the dispersion compensation device belongs to the control node (such as Figure 5 The control node 05 in Fig.18As shown, the dispersion compensation device includes: a second acquisition module 1001 and a second sending module 1002. The second acquisition module 1001 is used to acquire a second dispersion spectrum of the optical signal, and the second sending module 1002 is used to send the second dispersion spectrum to the receiving node or the optical fiber detection unit. The operation performed by the second acquisition module refers to the process of controlling the node to acquire the second dispersion spectrum in the aforementioned method embodiment, and the operation performed by the second sending module refers to the process of controlling the node to send the second dispersion spectrum to the receiving node or the dispersion compensation unit in the aforementioned embodiment.

[0274] There are various ways for the second acquisition module to acquire the second dispersion spectrum.

[0275] In an optional implementation, when acquiring the second dispersion spectrum, the second acquisition module first acquires the dispersion spectrum of each fiber segment in the multiple fiber segments, and then determines the second dispersion spectrum based on the dispersion spectrum of each fiber segment in the multiple fiber segments. Optionally, the second acquisition module is connected to multiple fiber detection units, and the multiple fiber detection units correspond to multiple fiber segments one by one, and the fiber detection units are used to detect the length and type of a corresponding fiber segment; the second acquisition module acquires the length and type of the first fiber segment detected by the fiber detection unit corresponding to the first fiber segment, and determines the dispersion spectrum of the first fiber segment based on the length and type of the first fiber segment. The first fiber segment is any fiber segment in the multiple fiber segments.

[0276] It is understandable that the second acquisition module can acquire the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the second acquisition module receives the dispersion spectrum of each optical fiber segment input by the staff, or the second acquisition module receives the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0277] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Optionally, the dispersion spectrum acquisition device also includes a judgment module for judging whether the number of filters in the optical fiber link is greater than the quantity threshold, and other modules in the dispersion compensation device except the judgment module are used to work when the number of filters is greater than the quantity threshold.

[0278] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. In the present application, the quantity threshold can be flexibly set according to at least one of the optical signal, the transmission rate and the modulation code type.

[0279] Optionally, when an integrated unit is used, the dispersion compensation device belonging to the receiving node and the dispersion spectrum acquisition device belonging to the control node provided in the embodiment of the present application include a processing module and a storage module. The processing module is used to control and manage the actions of the device, for example, to support the device to perform the actions performed by the receiving node or the control node in S101 to S108. The storage module is used to support the device to execute and store program codes and data.

[0280] For example, the processing module is a processor or a controller, and the processing module can implement or execute various exemplary logic blocks, modules and circuits described in combination with the disclosure of the embodiments of the present application. Optionally, the processor is a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, and the like. The storage module is a memory. The memory stores a program, and the processing module (such as a processor) is used to execute the program stored in the memory to implement the operations performed by the receiving node or the control node in the dispersion compensation method provided in any embodiment of the present application.

[0281] Optionally, the dispersion acquisition device further includes a communication module for communicating with other devices. For example, the communication module is a device such as a radio frequency circuit, a Bluetooth chip, etc. that interacts with other devices.

[0282] In one embodiment, when the processing module is the processor 202, the storage module is the memory 201, the communication module is the communication interface 203, and the processor 202, the memory 201 and the communication interface 203 are connected via the communication bus 204, the dispersion compensation device or the dispersion spectrum acquisition device involved in this embodiment is as follows: Fig.19 In an optional implementation, the above modules included in the dispersion compensation device or the dispersion spectrum acquisition device are computer programs stored in a memory and are called by a processor to implement the corresponding execution functions of each module.

[0283] According to the above content, the present application provides an optical communication system, including: a sending node, a receiving node and an optical fiber link (such as Figure 1As shown in the figure, the receiving node is connected to the sending node via an optical fiber link, and the optical fiber link includes: multiple optical fiber segments and at least one filter, each filter in the at least one filter is connected between two adjacent optical fiber segments; the receiving node is used to obtain a first dispersion spectrum, and the first dispersion spectrum is the accumulated dispersion spectrum of the at least one filter; the receiving node is also used to receive an optical signal from the optical fiber link; the receiving node is also used to perform a first dispersion compensation on the optical signal according to the first dispersion spectrum.

[0284] There are various ways for the receiving node to obtain the first dispersion spectrum.

[0285] In an optional implementation, the first dispersion spectrum is a dispersion spectrum obtained by the receiving node itself, and is not a dispersion spectrum sent by another node. The receiving node is used to obtain the dispersion spectrum of each filter in the at least one filter when obtaining the first dispersion spectrum, and determine the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0286] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the receiving node reads the dispersion spectrum of the first filter from the first filter. The first filter is any filter in the at least one filter.

[0287] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the receiving node determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0288] In another optional implementation, the optical communication system further includes a control node (such as Figure 5 As shown in FIG. 1 , the receiving node obtains the first dispersion spectrum by receiving the first dispersion spectrum sent by the control node. In this case, the control node can obtain the first dispersion spectrum in a manner that refers to the receiving node's self-acquisition of the first dispersion spectrum.

[0289] For example, the control node is configured to obtain the dispersion spectrum of each filter in the at least one filter when obtaining the first dispersion spectrum, and determine the first dispersion spectrum according to the dispersion spectrum of each filter in the at least one filter.

[0290] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the control node reads the dispersion spectrum of the first filter from the first filter. The first filter is any filter in the at least one filter.

[0291] Optionally, when acquiring the dispersion spectrum of each filter in the at least one filter, the control node determines the dispersion spectrum of the first filter according to the corresponding relationship between the parameters of the first filter and the dispersion spectrum of the first filter. For example, the parameters of the first filter include: at least one of the type of the first filter and the channel bandwidth of the first filter.

[0292] Optionally, the at least one filter is all filters or part of filters in the optical fiber link.

[0293] Exemplarily, the partial filters are selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link;

[0294] When the basis for selecting the above-mentioned partial filters includes the dispersion spectrum of each filter, if the optical fiber link includes a second filter and a third filter, and the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, then the selected partial filters include the second filter and do not include the third filter.

[0295] Optionally, the present application can not only compensate for the damage introduced by the dispersion of the filter in the optical signal, but also compensate for the damage introduced by the dispersion of the optical fiber segment in the optical signal. In this case, the receiving node is also used to obtain a second dispersion spectrum of the optical signal, and perform a second dispersion compensation on the optical signal according to the second dispersion spectrum. The second dispersion spectrum is the accumulated dispersion spectrum of the multiple optical fiber segments;

[0296] Optionally, the second dispersion compensation and the first dispersion compensation are performed sequentially, or the first dispersion compensation and the second dispersion compensation are performed sequentially, which is not limited in the present application.

[0297] There are various ways for the receiving node to obtain the second dispersion spectrum.

[0298] In an optional implementation, the receiving node does not obtain the second dispersion spectrum through the control node, but obtains the second dispersion spectrum by itself. For example, the receiving node is used to first obtain the dispersion spectrum of each fiber segment in the multiple fiber segments when obtaining the second dispersion spectrum, and then determine the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0299] Optionally, the optical communication system further includes a plurality of optical fiber detection units, the receiving node is connected to the plurality of optical fiber detection units, the plurality of optical fiber detection units correspond one-to-one to the plurality of optical fiber segments, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the receiving node is used to obtain the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determine the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment. The first optical fiber segment is any optical fiber segment among the plurality of optical fiber segments.

[0300] It is understandable that the receiving node can obtain the dispersion spectrum of each optical fiber segment without using the optical fiber detection unit. For example, the receiving node is used to receive the dispersion spectrum of each optical fiber segment input by the staff, or the receiving node is used to receive the dispersion spectrum of each optical fiber segment sent by other nodes. Optionally, the optical fiber detection unit is: OTDR.

[0301] In another optional implementation, the optical communication system further includes a control node (such as Figure 5 As shown), the receiving node is connected to the control node, and the receiving node is used to receive the second dispersion spectrum sent by the control node when acquiring the second dispersion spectrum. In this case, the control node can obtain the second dispersion spectrum in a manner that refers to the receiving node's method of obtaining the second dispersion spectrum by itself.

[0302] For example, the control node is used to first obtain the dispersion spectrum of each fiber segment in the multiple fiber segments when obtaining the second dispersion spectrum, and then determine the second dispersion spectrum according to the dispersion spectrum of each fiber segment in the multiple fiber segments.

[0303] Optionally, the optical communication system further comprises a plurality of optical fiber detection units (such as Figure 5 As shown), the control node is connected to multiple optical fiber detection units, the multiple optical fiber detection units correspond to multiple optical fiber segments one by one, and the optical fiber detection unit is used to detect the length and type of a corresponding optical fiber segment; the control node is used to obtain the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, and determine the dispersion spectrum of the first optical fiber segment according to the length and type of the first optical fiber segment.

[0304] It is understandable that the control node can obtain the dispersion spectrum of each optical fiber segment without going through the optical fiber detection unit. For example, the control node is used to receive the dispersion spectrum of each optical fiber segment input by the staff, or the control node is used to receive the dispersion spectrum of each optical fiber segment sent by other nodes.

[0305] Optionally, the number of filters in the above-mentioned optical fiber link is greater than a quantity threshold, and the quantity threshold is greater than 1. It can be seen that when the number of filters in the optical fiber link is greater than the quantity threshold, the optical communication system uses the dispersion compensation method provided in the present application to perform the first dispersion compensation (or, the first dispersion compensation and the second dispersion compensation) on the optical signal. When the number of filters in the optical fiber link is less than or equal to the quantity threshold, since the damage introduced by the dispersion of the filter in the optical signal is less at this time, the optical communication system does not need to use the dispersion compensation method provided in the above embodiment to perform dispersion compensation on the optical signal, thereby reducing the power consumption of each part of the optical communication system. Before executing the above method, the receiving node needs to determine whether the number of filters in the optical fiber link is greater than the quantity threshold, and execute the above method only when the number of filters is greater than the quantity threshold.

[0306] Optionally, the quantity threshold is related to at least one of the transmission rate and modulation code type of the optical signal. For example, when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is 16QAM, the quantity threshold is about 2; when the transmission rate of the optical signal is 200G / s and the modulation code type of the optical signal is QPSK, the quantity threshold is about 4. The present application can flexibly set the quantity threshold according to at least one of the optical signal, the transmission rate and the modulation code type.

[0307] Optionally, the control node does not send the second dispersion spectrum to the receiving node, and the receiving node does not perform the second dispersion compensation based on the second dispersion spectrum. In addition, the receiving node is connected to the optical fiber link through a dispersion compensation unit, the control node sends the second dispersion spectrum to the dispersion compensation unit, and the dispersion compensation unit performs the second dispersion compensation based on the second dispersion spectrum.

[0308] The present application also provides a chip, which includes a programmable logic circuit and / or program instructions; when the chip is running, it is used to implement the operations performed by a receiving node or a control node in any method provided in the present application.

[0309] The present application also provides a computer-readable storage medium, in which a computer program is stored; when the computer program is executed by a processor, the operations performed by a receiving node or a control node in any method provided in the present application are implemented.

[0310] The present application also provides a computer program product comprising instructions; when the computer program product is run on a computer, the computer is enabled to perform the operations performed by a receiving node or a control node in any method provided in the present application.

[0311] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product, and the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer is a general-purpose computer, a computer network, or other programmable device. The computer instructions are stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions are transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. Optionally, the computer-readable storage medium is any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. Optionally, the available medium is a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium, or a semiconductor medium (e.g., a solid-state hard disk), etc.

[0312] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "at least one" means one or more, and "plurality" means two or more, unless otherwise expressly limited. The term "and / or" is merely a description of the association relationship of associated objects, indicating the existence of three relationships. For example, A and / or B means: A exists alone, A and B exist at the same time, and B exists alone.

[0313] Different types of embodiments such as method embodiments and device embodiments provided in the embodiments of the present application can refer to each other, and the embodiments of the present application are not limited to this.

[0314] In the corresponding embodiments provided in the present application, it should be understood that the disclosed systems and devices can be implemented by other configuration methods. For example, the device embodiments described above are only schematic, for example, the division of modules is only a logical function division, and there can be other division methods in actual implementation, such as combining or integrating multiple modules into another system, or ignoring or not executing some features. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed is an indirect coupling or communication connection through some interfaces, devices or modules, which is electrical or other forms.

[0315] The units described as separate components may or may not be physically separated, and the components described as units may or may not be physical units, and may be located in one place or distributed on multiple devices. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0316] The above is only an optional implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A dispersion compensation method, characterized in that: The method is performed by a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each filter in the at least one filter is connected between two adjacent optical fiber segments, the method comprises: Acquire a first dispersion spectrum, where the first dispersion spectrum is an accumulated dispersion spectrum of the at least one filter; receiving an optical signal from the optical fiber link; A first dispersion compensation is performed on the optical signal according to the first dispersion spectrum.

2. The method according to claim 1, characterized in that The receiving node is connected to the control node, and the obtaining of the first dispersion spectrum includes: The first dispersion spectrum sent by the control node is received.

3. The method according to claim 1, characterized in that The obtaining of a first dispersion spectrum comprises: obtaining a dispersion spectrum of each filter of the at least one filter; The first dispersion spectrum is determined based on the dispersion spectrum of each filter in the at least one filter.

4. The method according to claim 3, characterized in that The obtaining of the dispersion spectrum of each filter in the at least one filter comprises: The dispersion spectrum of the first filter is read from a first filter, where the first filter is any one of the at least one filter.

5. The method according to claim 3, characterized in that: The obtaining of the dispersion spectrum of each filter in the at least one filter comprises: The dispersion spectrum of the first filter is determined according to a correspondence between a parameter of the first filter and the dispersion spectrum of the first filter, where the first filter is any one of the at least one filter.

6. The method according to claim 5, characterized in that The parameters of the first filter include: at least one of a type of the first filter and a channel bandwidth of the first filter.

7. The method according to any one of claims 1 to 6, characterized in that: The at least one filter is a part of the filter in the optical fiber link.

8. The method according to claim 7, characterized in that The partial filters are selected from all filters in the optical fiber link according to the modulation code type of the optical signal and / or the dispersion spectrum of each filter in the optical fiber link.

9. The method according to claim 8, characterized in that The optical fiber link includes a second filter and a third filter, the average value of each dispersion value in the dispersion spectrum of the second filter is greater than the average value of each dispersion value in the dispersion spectrum of the third filter, and the partial filter includes the second filter and does not include the third filter.

10. The method according to any one of claims 1 to 9, characterized in that: The method further comprises: Acquire a second dispersion spectrum, where the second dispersion spectrum is an accumulated dispersion spectrum of the multiple optical fiber segments; A second dispersion compensation is performed on the optical signal according to the second dispersion spectrum.

11. The method according to claim 10, characterized in that Performing second dispersion compensation on the optical signal according to the second dispersion spectrum includes: Before performing first dispersion compensation on the optical signal according to the first dispersion spectrum, performing second dispersion compensation on the optical signal according to the second dispersion spectrum.

12. The method according to claim 10 or 11, characterized in that: The receiving node is connected to the control node, and the obtaining of the second dispersion spectrum includes: The second dispersion spectrum sent by the control node is received.

13. The method according to any one of claims 1 to 12, characterized in that: The number of filters in the optical fiber link is greater than a number threshold, and the number threshold is greater than 1.

14. A dispersion acquisition method, characterized in that: The method is performed by a control node, the control node is connected to a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each filter in the at least one filter is connected between two adjacent optical fiber segments, the method comprises: Acquire a first dispersion spectrum, where the first dispersion spectrum is an accumulated dispersion spectrum of the at least one filter; The first dispersion spectrum is sent to the receiving node.

15. The method according to claim 14, characterized in that The obtaining of a first dispersion spectrum comprises: obtaining a dispersion spectrum of each filter of the at least one filter; The first dispersion spectrum is determined based on the dispersion spectrum of each filter in the at least one filter.

16. The method according to claim 15, characterized in that The obtaining of the dispersion spectrum of each filter in the at least one filter comprises: The dispersion spectrum of the first filter is read from a first filter, where the first filter is any one of the at least one filter.

17. The method according to claim 15, characterized in that The obtaining of the dispersion spectrum of each filter in the at least one filter comprises: The dispersion spectrum of the first filter is determined according to a correspondence between a parameter of the first filter and the dispersion spectrum of the first filter, where the first filter is any one of the at least one filter.

18. The method according to any one of claims 14 to 17, characterized in that: The at least one filter is a part of the filter in the optical fiber link.

19. The method according to any one of claims 14 to 18, characterized in that: The method further comprises: Acquire a second dispersion spectrum, where the second dispersion spectrum is an accumulated dispersion spectrum of the multiple optical fiber segments; The second dispersion spectrum is sent to the receiving node.

20. The method according to any one of claims 14 to 18, characterized in that: The receiving node is connected to the optical fiber link via a dispersion compensation unit, and the method further includes: Acquire a second dispersion spectrum, where the second dispersion spectrum is an accumulated dispersion spectrum of the multiple optical fiber segments; The second dispersion spectrum is sent to the dispersion compensation unit, and the dispersion compensation unit is used to perform second dispersion compensation on the passing optical signal according to the second dispersion spectrum.

21. The method according to claim 19 or 20, characterized in that The obtaining of the second dispersion spectrum comprises: Acquire a dispersion spectrum of each of the plurality of optical fiber segments; The second dispersion spectrum is determined according to the dispersion spectrum of each fiber segment in the plurality of fiber segments.

22. The method according to claim 21, characterized in that The control node is connected to a plurality of optical fiber detection units, the plurality of optical fiber detection units correspond to the plurality of optical fiber segments one by one, and the optical fiber detection units are used to detect the length and type of the corresponding optical fiber segments; The obtaining of the dispersion spectrum of each optical fiber segment in the plurality of optical fiber segments comprises: Acquire the length and type of the first optical fiber segment detected by the optical fiber detection unit corresponding to the first optical fiber segment, where the first optical fiber segment is any optical fiber segment among the multiple optical fiber segments; A dispersion spectrum of the first optical fiber segment is determined based on the length and type of the first optical fiber segment.

23. A dispersion compensation device, characterized in that: The dispersion compensation device belongs to a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each filter in the at least one filter is connected between two adjacent optical fiber segments, and the dispersion compensation device comprises: A processor and a memory, wherein the memory stores a program, and the processor is used to execute the program stored in the memory to implement the dispersion compensation method according to any one of claims 1 to 13.

24. A dispersion spectrum acquisition device, characterized in that: The dispersion spectrum acquisition device belongs to a control node, the control node is connected to a receiving node, the receiving node is connected to a sending node via an optical fiber link, the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, each of the at least one filter is connected between two adjacent optical fiber segments, the dispersion spectrum acquisition device comprises: A processor and a memory, wherein the memory stores a program, and the processor is used to execute the program stored in the memory to implement the dispersion acquisition method described in any one of claims 14 to 22.

25. A chip, characterized in that: The chip includes a programmable logic circuit and / or program instructions; When the chip is running, it is used to implement the dispersion compensation method as described in any one of claims 1 to 13, or, when the chip is running, it is used to implement the dispersion acquisition method as described in any one of claims 14 to 22.

26. A computer-readable storage medium, characterized in that: The storage medium stores a computer program; When the computer program is executed by a processor, the dispersion compensation method according to any one of claims 1 to 13 is implemented; or, when the computer program is executed by a processor, the dispersion acquisition method according to any one of claims 14 to 22 is implemented.

27. An optical communication system, characterized in that: include: A sending node, a receiving node and an optical fiber link, wherein the receiving node is connected to the sending node via the optical fiber link, and the optical fiber link comprises: a plurality of optical fiber segments and at least one filter, wherein each filter in the at least one filter is connected between two adjacent optical fiber segments; The receiving node is used to obtain a first dispersion spectrum, where the first dispersion spectrum is an accumulated dispersion spectrum of the at least one filter; The receiving node is also used to receive optical signals on the optical fiber link; The receiving node is further configured to perform first dispersion compensation on the optical signal according to the first dispersion spectrum.

28. The optical communication system according to claim 27, characterized in that: The optical communication system further comprises a control node; The control node is connected to the receiving node, and the control node is used to obtain the first dispersion spectrum and send the first dispersion spectrum to the receiving node.

29. The optical communication system according to claim 27 or 28, characterized in that: The receiving node is further configured to: Acquire a second dispersion spectrum, where the second dispersion spectrum is an accumulated dispersion spectrum of the multiple optical fiber segments; A second dispersion compensation is performed on the optical signal according to the second dispersion spectrum.

30. The optical communication system according to claim 29, characterized in that: The optical communication system further comprises a control node; The control node is connected to the receiving node, and the control node is used to obtain the second dispersion spectrum and send the second dispersion spectrum to the receiving node.

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