Method for compensating dispersion asymmetry in optical fiber time-frequency transmission and related device

Abstract

The application provides a method for compensating dispersion asymmetry in optical fiber time-frequency transmission and related equipment; the method comprises the following steps: dividing a first clock pulse signal into a second electrical signal of a first electrical signal at a local end; converting the first electrical signal into a first optical signal and sending the first optical signal to a remote end; receiving a second optical signal and converting the second optical signal into an electrical signal, determining a first time interval by using the converted electrical signal and sending the first time interval to the remote end; generating a dispersion measurement optical signal and sending the dispersion measurement optical signal to the remote end. Dividing a second clock pulse signal into a third electrical signal and a fourth electrical signal at the remote end; converting the third electrical signal into a second optical signal and sending the second optical signal to the local end; receiving the dispersion measurement optical signal from the local end and measuring a dispersion parameter according to the dispersion measurement optical signal, receiving the first optical signal of the local end and converting the first optical signal into an electrical signal; determining a second time interval by using the converted electrical signal and the fourth electrical signal, determining a delay difference between the first time interval and the second time interval, and correcting the second clock pulse signal according to the delay difference and the dispersion parameter.

Description

Technical Field

[0001] The embodiments of this application relate to the technical field of optical fiber communication, and in particular to a method and related equipment for compensating for dispersion asymmetry in optical fiber time-frequency transmission. Background Technology

[0002] Due to the dispersion effect and other asymmetric factors in optical fibers, the one-way time of optical signals propagating from the local end to the remote end in the optical fiber link changes. This results in inconsistent delays in the transmission of optical signals from the local end to the remote end and from the remote end to the local end. The transmission delay cannot be completely eliminated, thus making it impossible to accurately achieve optical fiber time synchronization. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a method and related equipment for compensating for dispersion asymmetry in optical fiber time-frequency transmission.

[0004] Based on the above objectives, this application provides a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission, which is applied at the local end;

[0005] The method specifically includes:

[0006] A first clock pulse signal is generated, and the first clock pulse signal is divided into a second electrical signal of a first electrical signal;

[0007] The first electrical signal is converted into a first optical signal, and the first optical signal is sent to a remote end connected to the local end via optical fiber;

[0008] The system receives the second optical signal from the remote end, converts it into an electrical signal, uses the second electrical signal and the electrical signal converted from the second optical signal to determine a first time interval, and sends it to the remote end.

[0009] An optical signal is generated for measuring the dispersion parameter and sent to the remote end.

[0010] Furthermore, the local terminal includes a first time interval counter, a first pulse trigger, and a first photoelectric converter;

[0011] Further, receiving the second optical signal from the remote end and converting it into an electrical signal, and using the second electrical signal and the electrical signal converted from the second optical signal to determine the first time interval, includes:

[0012] The first photoelectric converter receives the second optical signal from the remote end, and obtains the fifth electrical signal through demodulation and photoelectric conversion, and sends it to the first pulse trigger.

[0013] The first pulse trigger sends the fifth electrical signal for pulse shaping to obtain a sixth electrical signal, and the sixth electrical signal is output to the first time interval counter;

[0014] The first time interval counter is used to measure the first time interval between the second electrical signal and the sixth electrical signal.

[0015] Furthermore, the local end also includes a source dispersion measurement system;

[0016] Further, generating an optical signal for measuring the dispersion parameter and sending it to the remote end includes:

[0017] The transmitting end dispersion measurement system generates a third optical signal and / or a fourth optical signal, and transmits the third optical signal and / or the fourth optical signal to the remote end through the optical fiber;

[0018] Based on the same inventive concept, this application also provides another method for compensating for dispersion asymmetry in optical fiber time-frequency transmission, applied to the remote end;

[0019] The method specifically includes:

[0020] A second clock pulse signal is generated, and the second clock pulse signal is divided into a third electrical signal and a fourth electrical signal;

[0021] The third electrical signal is converted into a second optical signal, and the second optical signal is sent to the local end connected to the remote end via optical fiber;

[0022] The optical signal used for measuring the dispersion parameter is received from the local terminal, and the dispersion parameter is measured based on the optical signal used for measuring the dispersion parameter;

[0023] The system receives a first optical signal from the local terminal, converts the first optical signal into an electrical signal, uses the converted electrical signal and the fourth electrical signal to determine a second time interval, and receives the first time interval from the local terminal. Based on the delay difference between the first time interval and the second time interval and the dispersion parameter, the system corrects the time and frequency of the second clock pulse signal.

[0024] Furthermore, the remote end includes a second time interval counter, a second pulse trigger, a second photoelectric converter, a receiving end dispersion measurement system, and a delay unit;

[0025] Further, receiving an optical signal for measuring dispersion parameters from the local terminal, and measuring the dispersion parameters based on the optical signal for measuring dispersion parameters, includes:

[0026] The receiving end dispersion measurement system receives the third optical signal and / or the fourth optical signal from the local end, and receives the information of the third optical signal and / or the fourth optical signal. Based on the third optical signal and / or the information of the fourth optical signal, it generates dispersion parameters and sends the dispersion parameters to the delay unit.

[0027] Furthermore, the remote end also includes a second pulse source;

[0028] Further, the system receives a first optical signal from the local terminal, converts the first optical signal into an electrical signal, determines a second time interval using the converted electrical signal and the fourth electrical signal, and receives the first time interval from the local terminal. Based on the delay difference between the first time interval and the second time interval and the dispersion parameter, the system corrects the time and frequency of the second clock pulse signal, including:

[0029] The delay unit receives the first optical signal from the local terminal, performs dispersion asymmetry compensation on the first optical signal according to the dispersion parameter, obtains the fifth optical signal, and sends it to the second photoelectric converter.

[0030] The second photoelectric converter demodulates and performs photoelectric conversion to obtain a seventh electrical signal, which is then sent to the second pulse trigger.

[0031] The second pulse trigger is used to pulse-shape the seventh electrical signal to obtain the eighth electrical signal, which is then output to the second time interval counter.

[0032] The second time interval counter determines the delay correction amount based on the delay difference between the first time interval and the second time interval, and sends the delay correction amount to the second pulse source;

[0033] The second pulse source is instructed to perform time-frequency correction on the clock pulse signal according to the delay correction amount.

[0034] Based on the same inventive concept, this application also provides a compensation device for dispersion asymmetry in optical fiber time-frequency transmission, comprising:

[0035] The system comprises a first generation module, a first transmission module, a time interval module, and a first measurement module.

[0036] The first generation module is configured to generate a first clock pulse signal and divide the first clock pulse signal into a second electrical signal of the first electrical signal;

[0037] The first transmission module is configured to convert the first electrical signal into a first optical signal and send the first optical signal to a remote end connected to the local end via an optical fiber;

[0038] The time interval determination module is configured to receive a second optical signal from the remote end, convert it into an electrical signal, determine a first time interval using the second electrical signal and the electrical signal converted from the second optical signal, and send it to the remote end.

[0039] The first measurement module is configured to generate an optical signal for measuring dispersion parameters and send it to the remote end.

[0040] Based on the same inventive concept, this application also provides another compensation device for dispersion asymmetry in optical fiber time-frequency transmission, including: a second generation module, a second transmission module, a second measurement module and a correction module;

[0041] The second generation module is configured to generate a second clock pulse signal and divide the second clock pulse signal into a third electrical signal and a fourth electrical signal.

[0042] The second transmission module is configured to convert the third electrical signal into a second optical signal and send the second optical signal to a local end connected to the remote end via optical fiber;

[0043] The second measurement module is configured to receive a third optical signal from the local terminal, receive an optical signal for measuring dispersion parameters from the local terminal, and measure dispersion parameters based on the optical signal for measuring dispersion parameters.

[0044] The correction module is configured to receive a first optical signal from the local terminal, convert the first optical signal into an electrical signal, determine a second time interval using the converted electrical signal and the fourth electrical signal, receive the first time interval from the local terminal, and correct the time and frequency of the second clock pulse signal based on the delay difference between the first time interval and the second time interval and the dispersion parameter.

[0045] Based on the same inventive concept, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for compensating for dispersion asymmetry in optical fiber time-frequency transmission as described in any of the above claims.

[0046] Based on the same inventive concept, this application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission as described above.

[0047] As can be seen from the above, the fiber optic time-frequency transmission dispersion asymmetry compensation method and related equipment provided in this application, based on the first clock pulse signal generated at the local end, divides it into a first electrical signal and a second electrical signal. Simultaneously, while sending the first electrical signal to the remote end, the second electrical signal and the second optical signal received from the remote end are used to determine the first time interval between the two at the local end. Furthermore, at the remote end, based on the generated second clock pulse signal, it is divided into a third electrical signal and a fourth electrical signal. Simultaneously, while converting the third electrical signal into a second optical signal and sending it to the local end, the fourth electrical signal and the first optical signal received from the local end are used to determine the second time interval between the two at the remote end. This comprehensively considers the deviation between the first and second time intervals caused by fiber length asymmetry and dispersion asymmetry, thus determining the delay correction amount. This ensures that the determined delay correction amount accurately reflects the delay caused by dispersion asymmetry between the local end and the remote end. Therefore, when the delay correction amount is fed back to the second pulse source, accurate time-frequency correction of the second clock pulse signal is achieved, improving the synchronization accuracy between the local end and the remote end. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a structural block diagram of a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission according to an embodiment of this application;

[0050] Figure 2 This is a first flowchart of a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission according to an embodiment of this application;

[0051] Figure 3 This is a second flowchart of a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission according to an embodiment of this application;

[0052] Figure 4 This is a schematic diagram of the first structure of a device for compensating for dispersion asymmetry in optical fiber time-frequency transmission according to an embodiment of this application.

[0053] Figure 5 This is a schematic diagram of the second structure of the optical fiber time-frequency transmission dispersion asymmetry compensation device according to an embodiment of this application;

[0054] Figure 6 This is a schematic diagram of the electronic device structure according to an embodiment of this application. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0056] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] As described in the background section, existing methods for compensating for dispersion asymmetry in optical fiber time-frequency transmission are still insufficient to meet the needs of time-frequency synchronization in actual production.

[0058] In the process of implementing this application, the applicant discovered that the main problem with the relevant methods for compensating for dispersion asymmetry in optical fiber time-frequency transmission is that, due to the dispersion effect of optical fiber and other asymmetric factors, the one-way time of the optical signal propagating from the local end to the remote end in the optical fiber link changes, which in turn causes the delay of the optical signal from the local end to the remote end and from the remote end to the local end to be inconsistent. The transmission delay cannot be completely eliminated, thus making it impossible to accurately complete optical fiber time synchronization.

[0059] In long-distance wavelength division multiplexing (WDM) transmission, significant fiber dispersion asymmetry is often introduced. Dispersion compensation fibers are typically used to compensate for fiber dispersion. Therefore, the dispersion coefficient of the compensated fiber link is jointly determined by the single-mode fiber and the dispersion compensation fiber in the link. However, in actual transmission systems, standard single-mode fiber is usually buried underground in the form of optical cables, and its temperature stability is generally guaranteed. But dispersion compensation fiber is usually located in the node equipment room, and its temperature stability is relatively poor. Therefore, the dispersion coefficient of the entire fiber link is actually easily affected by temperature and exhibits dynamic changes, which in turn leads to dynamic changes in fiber dispersion asymmetry.

[0060] Based on this, one or more embodiments of this application provide a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission.

[0061] In the embodiments of this application, using Figure 1 As a concrete example, Figure 1 This demonstrates the interaction of optical signals between the local and remote ends, as well as the compensation of the optical signals.

[0062] Specifically, Figure 1 The local terminal is equipped with a first pulse source, a first pulse distributor, a first electro-optic converter, a first time interval counter, a first pulse trigger, a first photoelectric converter, and a transmitter dispersion measurement system.

[0063] Furthermore, Figure 1 The remote end of the device is equipped with a second pulse source, a second pulse distributor, a second electro-optic converter, a second time interval counter, a second pulse trigger, a second photoelectric converter, a receiving end dispersion measurement system, and a delay unit.

[0064] Furthermore, the first optical combiner at the local end and the second optical combiner at the remote end are connected via an optical fiber link.

[0065] Furthermore, a wireless long-distance communication can be established between the local transmitting dispersion measurement system and the remote receiving dispersion measurement system to transmit relevant information and data.

[0066] Furthermore, the first time interval counter at the local end and the second time interval counter at the remote end can transmit relevant information and data via optical link or other means.

[0067] The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0068] refer to Figure 2 This application discloses a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission, applied at the local end, and specifically includes the following steps:

[0069] Step S201: Generate a first clock pulse signal and divide the first clock pulse signal into a second electrical signal of the first electrical signal.

[0070] In an embodiment of this application, at the local end, the first pulse source can generate a first clock pulse signal.

[0071] Furthermore, the first pulse source is electrically connected to the first pulse distributor.

[0072] Based on this, the first pulse source can send the generated first clock pulse signal to the first pulse distributor that is electrically connected to it.

[0073] Furthermore, the first pulse distributor can divide the first clock pulse signal into two electrical signals, namely the first electrical signal and the second electrical signal.

[0074] Furthermore, the first pulse distributor is electrically connected to the first electro-optic converter and also electrically connected to the first time interval counter.

[0075] Based on this, the first pulse distributor can send the generated first electrical signal to the first electro-optic converter and send the second electrical signal to the first time interval counter.

[0076] Step S202: Convert the first electrical signal into a first optical signal and send the first optical signal to the remote end connected to the local end via optical fiber.

[0077] In the embodiments of this application, based on the electrical connection between the first pulse distributor and the first electro-optic converter, the first pulse distributor can send the generated first electrical signal to the first electro-optic converter.

[0078] Furthermore, after receiving the first electrical signal, the first electro-optic converter can convert the first electrical signal into a first optical signal.

[0079] Furthermore, the first electro-optical converter is electrically connected to the first optical combiner.

[0080] Based on this, the first electro-optic converter can send the generated first optical signal to the first optical combiner.

[0081] Furthermore, the first optical combiner can inject the first optical signal into the optical fiber link and transmit it to the second optical combiner at the remote end.

[0082] Step S203: Receive the second optical signal sent from the remote end, convert it into an electrical signal, determine the first time interval using the second electrical signal and the electrical signal converted from the second optical signal, and send it to the remote end.

[0083] In embodiments of this application, the first optical combiner can also receive a second optical signal from the second optical combiner at a remote location via an optical fiber link.

[0084] Furthermore, the first optical combiner is also electrically connected to the first photoelectric converter.

[0085] Based on this, the first optical combiner can send the second optical signal to the first photoelectric converter.

[0086] Furthermore, the first photoelectric converter can demodulate and photoelectrically convert the second optical signal to a fifth electrical signal.

[0087] Furthermore, the first photoelectric converter is also electrically connected to the first pulse trigger.

[0088] Based on this, the first photoelectric converter can send the generated fifth electrical signal to the first pulse trigger.

[0089] Furthermore, the first pulse trigger can perform pulse shaping on the received fifth electrical signal to obtain the sixth electrical signal.

[0090] Furthermore, the first pulse trigger is also electrically connected to the first time interval counter.

[0091] Based on this, the first pulse trigger can send the generated sixth electrical signal to the first time interval counter.

[0092] Furthermore, the first time interval counter can simultaneously receive a second electrical signal from the first pulse source at the local end, and a sixth electrical signal from the remote end.

[0093] Based on this, the first time interval counter can determine the first time interval between the second and sixth electrical signals according to the phase difference between the second and sixth electrical signals.

[0094] Furthermore, the first time interval counter can send the first time interval to the second time interval counter at the remote end.

[0095] Step S204: Generate an optical signal for measuring the dispersion parameter and send it to the remote end.

[0096] In embodiments of this application, the originating dispersion measurement system can generate an optical signal.

[0097] In order to measure the dispersion parameter, the transmitting dispersion measurement system can generate one optical signal or two optical signals. That is, the optical signal can be a third optical signal or a fourth optical signal, or it can include both a third optical signal and a fourth optical signal, and all of them are used to measure the dispersion parameter.

[0098] Furthermore, the originating dispersion measurement system is electrically connected to the first optical combiner.

[0099] Based on this, the originating dispersion measurement system can send the generated third and / or fourth optical signals to the first optical combiner, and instruct the first optical combiner to send the third and / or fourth optical signals to the second optical combiner at the remote end.

[0100] Meanwhile, the transmitting dispersion measurement system can also transmit the relevant information of the third optical signal and / or the relevant information of the fourth optical signal, such as their respective wavelengths, to the receiving dispersion measurement system at a remote location via wireless remote communication.

[0101] refer to Figure 3 Another embodiment of this application describes a method for compensating for dispersion asymmetry in optical fiber time-frequency transmission, applied to a remote end, and specifically includes the following steps:

[0102] Step S301: Generate a second clock pulse signal and divide the second clock pulse signal into a third electrical signal and a fourth electrical signal.

[0103] In an embodiment of this application, at the remote end, the second pulse source can generate a second clock pulse signal.

[0104] Furthermore, the second pulse source is electrically connected to the second pulse distributor.

[0105] Based on this, the second pulse source can send the generated second clock pulse signal to the second pulse distributor that is electrically connected to it.

[0106] Furthermore, the second pulse distributor can split the second clock pulse signal into two electrical signals, namely the third electrical signal and the fourth electrical signal.

[0107] Furthermore, the second pulse distributor is electrically connected to the second electro-optic converter and also electrically connected to the second time interval counter.

[0108] Based on this, the second pulse distributor can send the generated third electrical signal to the third electro-optic converter and the fourth electrical signal to the second time interval counter.

[0109] Step S302: Convert the third electrical signal into a second optical signal and send the second optical signal to the local end connected to the remote end via optical fiber.

[0110] In the embodiments of this application, based on the electrical connection between the second pulse distributor and the second electro-optic converter, the second pulse distributor can send the generated third electrical signal to the second electro-optic converter.

[0111] Furthermore, after receiving the third electrical signal, the second electro-optic converter can convert the third electrical signal into a second optical signal.

[0112] Furthermore, the second electro-optical converter is electrically connected to the second optical combiner.

[0113] Based on this, the second electro-optic converter can send the generated second optical signal to the second optical combiner.

[0114] Furthermore, the second optical combiner can inject the second optical signal into the optical fiber link and transmit it to the first optical combiner at the local end.

[0115] Step S303: Receive the optical signal for measuring the dispersion parameter from the local terminal, and measure the dispersion parameter according to the optical signal for measuring the dispersion parameter.

[0116] In embodiments of this application, the second optical combiner can receive a first optical signal, a third optical signal, and / or a fourth optical signal from the first optical combiner at the remote end via an optical fiber link.

[0117] Furthermore, the second optical combiner is electrically connected to the receiving end dispersion measurement system and simultaneously electrically connected to the delay unit.

[0118] Based on this, the second optical combiner can send the first optical signal to the delay unit and send the third and / or fourth optical signals to the receiving end dispersion measurement system.

[0119] Furthermore, after receiving the third and / or fourth optical signals from the second optical combiner, the receiving-end dispersion measurement system can also receive relevant information about the third and / or fourth optical signals, such as their respective wavelengths, from the local transmitting-end dispersion measurement system via wireless remote communication.

[0120] Based on this, the receiving-end dispersion measurement system can measure dispersion parameters in real time based on the third and / or fourth optical signals received in real time, as well as the relevant information of the third and / or fourth optical signals.

[0121] In another embodiment of this application, the receiving-end dispersion measurement system can also measure the dispersion parameters in real time based on any one of the third and fourth optical signals received in real time, as well as the relevant information of the optical signal.

[0122] Furthermore, the receiving end dispersion measurement system is also electrically connected to the delay unit.

[0123] Based on this, the receiving dispersion measurement system can send the measured dispersion parameters to the delay unit.

[0124] Step S304: Receive the first optical signal sent from the local terminal, convert the first optical signal into an electrical signal, determine the second time interval using the converted electrical signal and the fourth electrical signal, and receive the first time interval sent from the local terminal. Based on the delay difference between the first time interval and the second time interval and the dispersion parameter, correct the time and frequency of the second clock pulse signal.

[0125] In the embodiments of this application, after receiving the first optical signal and dispersion parameter from the local end, the delay unit can use the dispersion parameter to compensate for the dispersion asymmetry of the first optical signal and obtain the compensated fifth optical signal.

[0126] Among them, the dispersion asymmetry compensation is optical delay compensation.

[0127] Furthermore, the delay unit is also electrically connected to the second photoelectric converter.

[0128] Based on this, the delay unit can send the compensated fifth optical signal to the second photoelectric converter.

[0129] Furthermore, the second photoelectric converter can perform photoelectric conversion on the fifth optical signal and generate the eighth electrical signal.

[0130] Furthermore, the second photoelectric converter is also electrically connected to the second time interval counter.

[0131] Based on this, the second photoelectric converter can send the converted eighth electrical signal to the second time interval counter.

[0132] In this embodiment, the second time interval counter can simultaneously obtain a fourth electrical signal from the second pulse source at the remote end and an eighth electrical signal from the local end.

[0133] Based on this, the second time interval counter can determine the second time interval between the fourth and eighth electrical signals according to the phase difference between the fourth and eighth electrical signals.

[0134] Furthermore, the second time interval counter can also receive the first time interval from the first time interval counter at the local end.

[0135] Based on this, the second time interval counter can simultaneously possess the first time interval and the second time interval. Accordingly, the second time interval counter can determine the time-frequency delay difference caused by dispersion based on the first time interval and the second time interval, and generate a delay correction amount.

[0136] Furthermore, the second time interval counter is also electrically connected to the second pulse source.

[0137] Based on this, the second time interval counter can send the delay correction amount to the second pulse source to correct the time and frequency of the second clock pulse signal generated by the second pulse source, so that the second clock pulse signal is synchronized with the first clock pulse signal.

[0138] In this embodiment, the remote end uses the optical signal sent from the local end as a reference to correct the optical signal it generates.

[0139] In another embodiment of this application, the delay unit may also be disposed between the second photoelectric converter and the second pulse trigger, and the second photoelectric converter may be electrically connected to the second optical combiner and the receiving end dispersion measurement system.

[0140] Based on this, the compensation of the delay unit for the first optical signal can be changed to the compensation of the electrical signal output by the second photoelectric converter, that is, the optical delay compensation can be changed to the electrical delay compensation.

[0141] In another embodiment of this application, the delay unit may also be configured to be electrically connected to the second time interval counter.

[0142] Based on this, delay compensation for optical and electrical signals can be omitted initially. After calculating the delay difference, the dispersion parameter can be used to compensate for the delay difference, and the delay correction amount can be determined using the compensated delay difference to correct the second clock pulse signal of the second pulse source.

[0143] As can be seen, the fiber optic time-frequency transmission dispersion asymmetry compensation method of this application, based on the first clock pulse signal generated at the local end, divides it into a first electrical signal and a second electrical signal. Simultaneously, while sending the first electrical signal to the remote end, the method uses the second electrical signal and the second optical signal received from the remote end to determine the first time interval between the two at the local end. Furthermore, at the remote end, based on the generated second clock pulse signal, the method divides it into a third electrical signal and a fourth electrical signal. Simultaneously, while converting the third electrical signal into a second optical signal and sending it to the local end, the method uses the fourth electrical signal and the first optical signal received from the local end to determine the second time interval between the two at the remote end. This comprehensively considers the deviation between the first and second time intervals caused by fiber length asymmetry and dispersion asymmetry, thus determining the delay correction amount. This ensures that the determined delay correction amount accurately reflects the delay caused by dispersion asymmetry between the local end and the remote end. Therefore, when the delay correction amount is fed back to the second pulse source, accurate time-frequency correction of the second clock pulse signal is achieved, improving the synchronization accuracy between the local end and the remote end.

[0144] It should be noted that the method of the embodiments of this application can be executed by a single device, such as a computer or server. The method of this embodiment can also be applied in a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the method of the embodiments of this application, and the multiple devices will interact with each other to complete the method described.

[0145] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0146] Based on the same inventive concept, corresponding to any of the above embodiments, the embodiments of this application also provide a compensation device for dispersion asymmetry in optical fiber time-frequency transmission.

[0147] refer to Figure 4 The device for compensating for dispersion asymmetry in optical fiber time-frequency transmission includes: a first generation module 401, a first transmission module 402, a time interval module 403, and a first measurement module 404.

[0148] The first generation module 401 is configured to generate a first clock pulse signal and divide the first clock pulse signal into a second electrical signal of the first electrical signal.

[0149] The first transmission module 402 is configured to convert the first electrical signal into a first optical signal and send the first optical signal to a remote end connected to the local end via an optical fiber;

[0150] The time interval determination module 403 is configured to receive the second optical signal sent from the remote end, convert it into an electrical signal, determine a first time interval using the second electrical signal and the electrical signal converted from the second optical signal, and send it to the remote end.

[0151] The first measurement module 404 is configured to generate an optical signal for measuring dispersion parameters and send it to the remote end.

[0152] Based on the same inventive concept, corresponding to any of the above embodiments, the embodiments of this application also provide another compensation device for dispersion asymmetry in optical fiber time-frequency transmission.

[0153] refer to Figure 5 The device for compensating for dispersion asymmetry in optical fiber time-frequency transmission includes: a second generation module 501, a second transmission module 502, a second measurement module 503, and a correction module 504.

[0154] The second generation module 501 is configured to generate a second clock pulse signal and divide the second clock pulse signal into a third electrical signal and a fourth electrical signal.

[0155] The second transmission module 502 is configured to convert the third electrical signal into a second optical signal and send the second optical signal to a local end connected to the remote end via optical fiber;

[0156] The second measurement module 503 is configured to receive a third optical signal from the local terminal, receive an optical signal for measuring dispersion parameters from the local terminal, and measure dispersion parameters based on the optical signal for measuring dispersion parameters.

[0157] The correction module 504 is configured to receive a first optical signal from the local terminal, convert the first optical signal into an electrical signal, determine a second time interval using the converted electrical signal and the fourth electrical signal, and receive the first time interval from the local terminal, and correct the time and frequency of the second clock pulse signal based on the delay difference between the first time interval and the second time interval and the dispersion parameter.

[0158] For ease of description, the above apparatus is described in terms of its functions, divided into various modules. Of course, in implementing the embodiments of this application, the functions of each module can be implemented in one or more software and / or hardware.

[0159] The apparatus of the above embodiments is used to implement the corresponding optical fiber time-frequency transmission dispersion asymmetry compensation method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0160] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, embodiments of this application also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the method for compensating for dispersion asymmetry in optical fiber time-frequency transmission as described in any of the above embodiments.

[0161] Figure 6This embodiment illustrates a more specific hardware structure of an electronic device, which may include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected internally via the bus 1050.

[0162] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application.

[0163] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store the operating system and other applications. When the technical solutions provided in the embodiments of this application are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0164] The input / output interface 1030 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components within the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touchscreens, microphones, various sensors, etc., while output devices may include displays, speakers, vibrators, indicator lights, etc.

[0165] The communication interface 1040 is used to connect a communication module (not shown in the figure) to enable communication between this device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0166] Bus 1050 includes a pathway for transmitting information between various components of the device, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0167] It should be noted that although the above-described device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the embodiments of this application, and not necessarily all the components shown in the figures.

[0168] The apparatus of the above embodiments is used to implement the corresponding optical fiber time-frequency transmission dispersion asymmetry compensation method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0169] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the method for compensating for dispersion asymmetry in optical fiber time-frequency transmission as described in any of the above embodiments.

[0170] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0171] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the method for compensating for dispersion asymmetry in optical fiber time-frequency transmission as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0172] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0173] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this application, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this application, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this application will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that the embodiments of this application can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0174] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0175] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A method for compensating for dispersion asymmetry in optical fiber time-frequency transmission, characterized in that, Applied to the local end; The local end includes a transmission dispersion measurement system; The method includes: A first clock pulse signal is generated, and the first clock pulse signal is divided into a second electrical signal of a first electrical signal; The first electrical signal is converted into a first optical signal, and the first optical signal is sent to a remote end connected to the local end via optical fiber; The system receives the second optical signal from the remote end, converts it into an electrical signal, uses the second electrical signal and the electrical signal converted from the second optical signal to determine a first time interval, and sends it to the remote end. The transmitting end dispersion measurement system generates a third optical signal and / or a fourth optical signal, and transmits the third optical signal and / or the fourth optical signal to the remote end through the optical fiber; and transmits the information of the third optical signal and / or the information of the fourth optical signal to the remote end.

2. The method according to claim 1, characterized in that, The local terminal includes a first time interval counter, a first pulse trigger, and a first photoelectric converter; The step of receiving the second optical signal from the remote end, converting it into an electrical signal, and using the second electrical signal and the electrical signal converted from the second optical signal to determine the first time interval includes: The first photoelectric converter receives the second optical signal from the remote end, and obtains the fifth electrical signal through demodulation and photoelectric conversion, and sends it to the first pulse trigger. The first pulse trigger sends the fifth electrical signal for pulse shaping to obtain a sixth electrical signal, and the sixth electrical signal is output to the first time interval counter; The first time interval counter is used to measure the first time interval between the second electrical signal and the sixth electrical signal.

3. A method for compensating for dispersion asymmetry in optical fiber time-frequency transmission, characterized in that, Applications in remote locations; The method includes: A second clock pulse signal is generated, and the second clock pulse signal is divided into a third electrical signal and a fourth electrical signal; The third electrical signal is converted into a second optical signal, and the second optical signal is sent to the local end connected to the remote end via optical fiber; The optical signal used for measuring the dispersion parameter is received from the local terminal, and the dispersion parameter is measured based on the optical signal used for measuring the dispersion parameter; The system receives a first optical signal from the local terminal, converts the first optical signal into an electrical signal, uses the converted electrical signal and the fourth electrical signal to determine a second time interval, and receives the first time interval from the local terminal. Based on the delay difference between the first time interval and the second time interval and the dispersion parameter, the system corrects the time and frequency of the second clock pulse signal.

4. The method according to claim 3, characterized in that, The remote end includes a second time interval counter, a second pulse trigger, a second photoelectric converter, a receiving end dispersion measurement system, and a delay unit; The step of receiving an optical signal for measuring dispersion parameters from the local end and measuring the dispersion parameters based on the optical signal for measuring dispersion parameters includes: The receiving end dispersion measurement system receives the third optical signal and / or the fourth optical signal from the local end, and receives the information of the third optical signal and / or the fourth optical signal. Based on the third optical signal and / or the information of the fourth optical signal, it generates dispersion parameters and sends the dispersion parameters to the delay unit.

5. The method according to claim 4, characterized in that, The remote terminal also includes a second pulse source; The process of receiving a first optical signal from the local terminal, converting the first optical signal into an electrical signal, determining a second time interval using the converted electrical signal and the fourth electrical signal, and receiving the first time interval from the local terminal, and correcting the time and frequency of the second clock pulse signal based on the delay difference between the first time interval and the second time interval and the dispersion parameter, includes: The delay unit receives the first optical signal from the local terminal, performs dispersion asymmetry compensation on the first optical signal according to the dispersion parameter, obtains the fifth optical signal, and sends it to the second photoelectric converter. The second photoelectric converter demodulates and performs photoelectric conversion to obtain a seventh electrical signal, which is then sent to the second pulse trigger. The second pulse trigger is used to perform pulse shaping on the seventh electrical signal to obtain the eighth electrical signal, which is then output to the second time interval counter. The second time interval counter determines the delay correction amount based on the delay difference between the first time interval and the second time interval, and sends the delay correction amount to the second pulse source; The second pulse source is instructed to perform time-frequency correction on the clock pulse signal according to the delay correction amount.

6. A device for compensating for dispersion asymmetry in optical fiber time-frequency transmission, characterized in that, include: The module comprises a first generation module, a first transmission module, a time interval module, and a first measurement module. The first generation module is configured to generate a first clock pulse signal and divide the first clock pulse signal into a second electrical signal of the first electrical signal; The first transmission module is configured to convert the first electrical signal into a first optical signal and send the first optical signal to a remote end connected to the local end via optical fiber; The time interval determination module is configured to receive a second optical signal from the remote end, convert it into an electrical signal, determine a first time interval using the second electrical signal and the electrical signal converted from the second optical signal, and send it to the remote end. The first measurement module is configured such that the local end includes a transmitting dispersion measurement system; the transmitting dispersion measurement system generates a third optical signal and / or a fourth optical signal, and transmits the third optical signal and / or the fourth optical signal to the remote end through the optical fiber; and transmits the information of the third optical signal and / or the information of the fourth optical signal to the remote end.

7. A device for compensating for dispersion asymmetry in optical fiber time-frequency transmission, characterized in that, include: The system comprises a second generation module, a second transmission module, a second measurement module, and a correction module. The second generation module is configured to generate a second clock pulse signal and divide the second clock pulse signal into a third electrical signal and a fourth electrical signal. The second transmission module is configured to convert the third electrical signal into a second optical signal and send the second optical signal to a local end connected to the remote end via optical fiber; The second measurement module is configured to receive a third optical signal from the local end, receive an optical signal for measuring dispersion parameters from the local end, and measure dispersion parameters based on the optical signal for measuring dispersion parameters. The correction module is configured to receive a first optical signal from the local terminal, convert the first optical signal into an electrical signal, determine a second time interval using the converted electrical signal and the fourth electrical signal, receive the first time interval from the local terminal, and correct the time and frequency of the second clock pulse signal based on the delay difference between the first time interval and the second time interval and the dispersion parameter.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1 to 5.

9. A non-transitory computer-readable storage medium, characterized in that, The non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the method according to any one of claims 1 to 5.

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