A dispersion compensation method, system, device and storage medium

Abstract

The present invention discloses a dispersion compensation method, system, device and storage medium. The method includes: obtaining multiple signals based on an input optical signal, wherein the spectrum of any one of the multiple signals is narrower than that of the input optical signal, and there is spectral aliasing between any two of the multiple signals; processing the multiple signals to cause at least one of the multiple signals to be delayed; and synthesizing the processed multiple signals to obtain an output signal. The present invention breaks through the problem that the existing optical devices have limited dispersion compensation due to limited resolution, and improves the performance of optical domain dispersion compensation in an optical communication system from the perspective of system design. It can not only increase the range of dispersion compensation in an optical link, but also flexibly adjust the dispersion compensation value. The present invention can be widely applied to the field of optical communication technology.

Description

Technical Field

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

[0002] In the field of optical communication, optical fibers are the main medium for transmitting signals. Dispersion in optical fibers is one of the main factors affecting the quality of optical communication. It causes different propagation speeds of lights with different frequencies in the optical signal, resulting in different arrival times at the receiving end, thus causing the received signal to have a broadening effect and affecting the transmission performance of the system. The methods of dispersion compensation are mainly divided into optical domain compensation and electrical domain compensation.

[0003] Traditional optical domain dispersion compensation uses dispersion compensation fibers, gratings, etc. However, these methods all require adding additional optical devices and have relatively large power losses, reducing the signal-to-noise ratio of transmission. In recent years, with the rapid development of digital signal processing, electrical domain compensation has become the mainstream and has been widely applied in 400G and 800G optical fiber transmission systems. However, with the increase in rate, the high power consumption problem of electrical domain compensation has gradually attracted attention.

[0004] A wavelength selective switch (WSS) is an essential device for optical switching and optical routing in an optical fiber link and has been widely used in optical fiber backbone networks. A programmable WSS first decomposes the input signal into a large number of optical path signals with extremely narrow spectral widths in the optical path. Each optical path corresponds to each pixel in the programmable liquid crystal on silicon technology (LCoS). By programming and controlling the refractive index of each pixel in the LCoS, the attenuation and delay of the optical path signal passing through this pixel can be controlled. This device can demultiplex and multiplex a wavelength division multiplexing system to achieve all-optical switching and routing. Since the WSS is an essential device in the optical fiber link, an idea for optical domain dispersion compensation is to use the existing WSS to achieve optical domain dispersion compensation and avoid adding additional special devices such as dispersion compensation fibers and gratings. However, due to the limitations of device technology, the resolution of each pixel is limited. Even for the current WSS, the optical signal bandwidth corresponding to each pixel is about several GHz, and the interval between the central frequencies of different pixels is about 1 GHz. At this resolution, the dispersion compensation ability of the WSS is very limited, especially for high baud rate signals, and this limitation is very obvious. One way to improve the dispersion compensation ability is to improve the device and increase the resolution, such as reducing the bandwidth of the narrow spectral signals corresponding to each pixel, but this is limited by the manufacturing process. Summary of the Invention

[0005] To solve at least one of the technical problems existing in the prior art to a certain extent, the purpose of the present invention is to provide a dispersion compensation method, system, device, and storage medium.

[0006] The technical solution adopted by the present invention is:

[0007] A dispersion compensation method includes the following steps:

[0008] Obtain multiple signals based on an input optical signal, where the spectrum of any one of the multiple signals is narrower than the spectrum of the input optical signal, and there is spectral overlap between any two of the multiple signals;

[0009] Process the multiple signals so that at least one of the multiple signals is delayed;

[0010] Synthesize the processed multiple signals to obtain an output signal;

[0011] Among them, the dispersion compensation method includes one or a combination of two of the following two features:

[0012] In the step of obtaining multiple signals based on the input optical signal, the acquisition of at least one of the multiple signals includes the following steps: obtain a plurality of first narrow-spectrum optical signals based on the input optical signal, adjust the amplitude and / or phase of the plurality of first narrow-spectrum optical signals, and obtain at least one of the multiple signals based on the adjusted first narrow-spectrum optical signals;

[0013] In the step of synthesizing the processed multiple signals to obtain an output signal, the operation on at least one of the processed multiple signals includes the following steps: obtain a plurality of second narrow-spectrum optical signals based on at least one of the processed multiple signals, adjust the amplitude and / or phase of the plurality of second narrow-spectrum optical signals, and obtain the output signal based on the adjusted second narrow-spectrum optical signals.

[0014] Current wavelength selective switches (WSSs), programmable optical filters (waveshapers), and optical devices based on similar principles are widely used in optical routing and wavelength division multiplexing systems for demultiplexing and multiplexing different wavelengths. The principle of these devices is to first decompose an optical signal into a large number of signals with narrow spectra (i.e., the optical signals with narrow spectra). For current advanced WSS devices, the 3dB spectral width of each decomposed narrow-spectrum optical signal is about several GHz, and the frequency interval between adjacent optical path signals is 1GHz. Each narrow-spectrum optical signal is incident on a pixel of a programmable LCoS. Devices such as WSSs control the refractive index of the LCoS pixels through software to control the amplitude and phase of each optical path, thereby achieving filtering, demultiplexing, and multiplexing. Similarly, by setting appropriate phases for each optical path, the inverse function of the response for compensating dispersion can also be fitted. Therefore, devices such as WSSs also have a certain dispersion compensation ability. However, limited by the device resolution (such as several GHz bandwidth for each narrow-spectrum optical path, etc.), the dispersion compensation ability that can be obtained directly using optical devices such as WSSs is very limited, especially for current high baud rate signals.

[0015] The main idea of the present invention is to first decompose an optical signal into multiple signals with medium bandwidths (i.e., the multiple signals). For example, a 150 GBaud signal is decomposed into 15 signals of about 10 GHz. After processing the multiple signals, the processed multiple signals are synthesized to recover the compensated input optical signal, i.e., the output signal. The present invention places no restrictions on the input optical signal, which can be a single-carrier signal, a multi-carrier signal, a polarization multiplexed signal, etc. The spectrum of each signal in the multiple signals after decomposition is a part of the spectrum of the input optical signal. In particular, different from the demultiplexing in a wavelength division multiplexing system, there is spectral aliasing between any two of the multiple signals decomposed in the present invention. In addition, each signal in the multiple signals only contains a part of the input optical signal, so a synthesis step is also required to obtain the compensated input optical signal. Without considering dispersion compensation, the entire process of decomposing the input optical signal into multiple signals and re-synthesizing the multiple signals into the output signal needs to ensure signal losslessness, i.e., the output signal is equal to the input optical signal.

[0016] It should be noted that the present invention does not limit the input optical signal to only obtaining the multiple signals with pairwise spectral aliasing described above, and may also include other signals. For example, a signal identical to the input optical signal is extracted from the input optical signal for link monitoring. Optionally, for a wavelength division multiplexed signal, the signal of each wavelength can be decomposed into multiple signals. In this case, the multiple signals should be understood as the multiple signals with pairwise spectral aliasing after decomposing the signal of any one wavelength.

[0017] In the case of dispersion, through the decomposition - processing - synthesis architecture of the present invention, the compensation for the dispersion effect of the input optical signal can be decomposed into the compensation for the dispersion effect within each signal among multiple signals and the compensation for the dispersion effect between multiple signals. Among them, the dispersion effect between each signal is compensated in the step of processing the multiple signals. It has been theoretically proven that the compensation for such a dispersion effect can be achieved by means of optical path delay; the dispersion effect within each signal among multiple signals can be compensated when the input optical signal is decomposed into multiple signals, or can be compensated when the processed multiple signals are synthesized into an output signal, or can be compensated partially during decomposition, partially during the processing of multiple signals, and partially during synthesis, etc. in different ways. The present invention defines the acquisition of at least one signal among multiple signals in the process of obtaining multiple signals according to the input optical signal, and / or the operation on at least one signal among the processed multiple signals in the process of synthesizing the processed multiple signals into an output signal, adopting the working principle similar to that of a WSS device. Because the influence of dispersion is related to the bandwidth of the signal, the dispersion compensation ability of the same WSS device for signals with a relatively narrow bandwidth (such as 10 GHz) is greatly improved compared to that for broadband (such as 150 GHz) input optical signals. Therefore, through the decomposition - processing - synthesis architecture of the present invention, in the case of using the same device, the dispersion compensation ability within each signal among multiple signals is greatly improved, while the dispersion effect between multiple signals can be compensated by means of delay, thereby improving the overall dispersion compensation ability for the input optical signal.

[0018] Further, in the step of obtaining multiple signals according to the input optical signal, the acquisition of any one signal among multiple signals includes the following steps: obtaining a plurality of first narrow - spectrum optical signals according to the input optical signal, adjusting the amplitude and / or phase of the plurality of first narrow - spectrum optical signals, and then obtaining any one signal among the multiple signals according to the adjusted first narrow - spectrum optical signals;

[0019] In the step of synthesizing the processed multiple signals to obtain an output signal, the operation on any one signal among the processed multiple signals includes the following steps: obtaining a plurality of second narrow - spectrum optical signals according to any one signal among the processed multiple signals, adjusting the amplitude and / or phase of the plurality of second narrow - spectrum optical signals, and then obtaining an output signal according to the adjusted second narrow - spectrum optical signals.

[0020] Further defines the acquisition of any one of the multiple signals during the process of decomposing the input optical signal into multiple signals, and / or the operation on any one of the multiple signals during the process of synthesizing the processed multiple signals into an output signal, adopting the working principle similar to that of a WSS device. It should be noted that the compensation for the dispersion effect within any one of the multiple signals can be achieved during the process of decomposing the input optical signal into multiple signals, or during the process of processing the multiple signals, or during the process of synthesizing the processed multiple signals into an output signal, or a part of it can be achieved respectively in any two or three of the above processes.

[0021] Taking the example of obtaining N signals according to the input optical signal, the acquisition of any one of the N signals can be achieved through the following embodiment: First, use a power splitter to divide the input optical signal into N parts, decompose the first part of the optical signal into several optical signals with narrow spectra, each narrow-spectrum signal is incident on a pixel in the LCoS optical processor, and by controlling the refractive index of each pixel, the amplitude and / or phase of the narrow-spectrum optical signal passing through this pixel is regulated, and then the regulated narrow-spectrum signals are combined to obtain the first signal among the N signals. Similarly, the second part of the optical signal is also decomposed into several optical signals with narrow spectra, each narrow-spectrum signal is incident on a pixel in the optical processor, and by controlling the refractive index of each pixel, the amplitude and / or phase of the narrow-spectrum optical signal passing through this pixel is regulated, and then the regulated narrow-spectrum signals are combined to obtain the second signal among the N signals. It should be noted that the regulation values of the amplitude and / or phase for each pixel point during the extraction of the second signal are different from those during the extraction of the first signal. By analogy, the third to the Nth signals can be obtained.

[0022] In the above example, there are several different considerations for the design of the regulation values of the amplitude and / or phase for each pixel point: 1) The step of obtaining N signals according to the input optical signal only performs decomposing the input optical signal into multiple signals with medium bandwidths, without compensating for the dispersion effect within each of the multiple signals; or 2) The step of obtaining N signals according to the input optical signal not only performs decomposing the input optical signal into multiple signals with medium bandwidths, but also partially compensates for the dispersion effect within each of the multiple signals; or 3) The step of obtaining N signals according to the input optical signal not only performs decomposing the input optical signal into multiple signals with medium bandwidths, but also completely compensates for the dispersion effect within each of the multiple signals. In the first two cases, the (remaining) dispersion compensation for each of the multiple signals can be compensated during the step of processing the multiple signals, or during the step of obtaining the output signal according to the processed multiple signals, or both.

[0023] It should be noted that the present invention does not limit the decomposition of the input optical signal into multiple signals only. For example, in the above example, the (N + 1)-th signal can also be obtained. This signal is a part of the power shunt of the input optical signal and has the same spectral characteristics as the input optical signal, and is used for monitoring the link information. This (N + 1)-th signal does not belong to the multiple signals defined in the present invention.

[0024] Further, in the step of obtaining at least one signal among the multiple signals, the number of the first narrow-spectrum optical signals obtained according to the input optical signal is more than two;

[0025] and / or;

[0026] In the step of operating on at least one signal among the processed multiple signals, the number of the second narrow-spectrum optical signals obtained according to at least one signal among the processed multiple signals is more than two.

[0027] The present invention defines that when obtaining at least one signal among the multiple signals according to the input optical signal by adopting the WSS principle, and / or when operating on at least one signal among the processed multiple signals by adopting the WSS principle to obtain the output signal, the representation of two or more pixels of the LCoS optical processor is required. In other words, when decomposing the optical signal into multiple signals with medium bandwidths (i.e., the multiple signals), the spectral width of the signals with medium bandwidths is greater than the spectral width of the narrow-spectrum optical signal corresponding to one pixel in the LCoS optical processor.

[0028] Further, the regulation of the amplitude and / or phase of the several first narrow-spectrum optical signals includes:

[0029] Regulating the amplitude and / or phase of the several first narrow-spectrum optical signals in a software-controlled manner;

[0030] and / or;

[0031] The regulation of the amplitude and / or phase of the several second narrow-spectrum optical signals includes:

[0032] Regulating the amplitude and / or phase of the several second narrow-spectrum optical signals in a software-controlled manner.

[0033] The present invention defines that the operation of regulating the amplitude and / or phase of a narrow-spectrum signal is carried out in a programmed / software-controlled manner, which is a common control method for devices such as WSS and waveshaper. It should be noted that the present invention does not limit the implementation of the proposed method by cascading existing devices (such as WSS and waveshaper), and also includes new devices integrating programmable liquid crystal on silicon (LCoS) optical elements and software control functions for pixel regulation. In addition, more generally, other technologies of spatial light modulators and corresponding software control functions can also be used for pixel regulation. LCoS technology is the most commonly used technology of spatial light modulators and is also the technology used by devices such as WSS and waveshaper. However, the present invention does not limit that only LCoS technology can be used to regulate the amplitude and / or phase of each narrow-spectrum optical signal.

[0034] Further, the regulation of the amplitude and / or phase of the plurality of first narrow-spectrum optical signals includes:

[0035] Regulating the amplitude and / or phase of the plurality of first narrow-spectrum optical signals by using an LCoS optical processor;

[0036] And / or;

[0037] The regulation of the amplitude and / or phase of the plurality of second narrow-spectrum optical signals includes:

[0038] Regulating the amplitude and / or phase of the plurality of second narrow-spectrum optical signals by using an LCoS optical processor.

[0039] It is further defined that the liquid crystal on silicon (LCoS) optical processor method commonly used in devices such as programmable optical filters and wavelength selective switches is used in the dispersion compensation method. However, it should be understood that the present invention can also adopt other methods of spatial light modulators (SLM), such as digital light processing (DLP) and ferroelectric liquid crystal (FLCoS). The present invention should also include other various classification methods of spatial light modulators, such as electrically addressed spatial light modulators (EASLM) and optically addressed spatial light modulators (OASLM).

[0040] Further, in the step of processing the multiplexed signals to cause at least one of the multiplexed signals to be delayed, it includes:

[0041] Using any one or a combination of optical waveguide delay, fiber delay, spatial light delay, grating, lens, mirror, and prism to perform delay processing on at least one of the multiplexed signals.

[0042] The present invention provides a specific method or device for implementing delay for at least one of multiple signals. Separate optical elements can be used, or these elements can be integrated with the elements in the step of obtaining multiple signals from the input optical signal and / or in the step of obtaining the output signal from the processed multiple signals to form a new device for implementing the method of the present invention.

[0043] Further, the all-optical dispersion compensation method further includes:

[0044] Compensating for other device and / or transmission physical damages except for dispersion.

[0045] In addition to dispersion damage, the input optical signal may also have other damages, such as high-frequency attenuation caused by bandwidth limitation. In the step of obtaining multiple signals from the input optical signal, in addition to implementing decomposition and / or in-signal dispersion compensation, compensation for such damages can also be included. For example, for high-frequency attenuation, the amplitude of the signal corresponding to the high frequency in the multiple signals can be set higher, while the amplitude of the signal corresponding to the low frequency can be set lower. Similarly, equalization for other damages can also be added in the step of processing the multiple signals, or in the step of obtaining the output signal from the processed multiple signals, or in any two or three steps.

[0046] Further, the step of processing the multiple signals includes causing each signal to be delayed.

[0047] Further, in the step of processing the multiple signals, the delay of at least one of the multiple signals has an adaptive adjustment ability.

[0048] The delay operation of the multiple signals has an adaptive adjustment ability, and the delay of the signal can be adjusted by software control, so as to flexibly change the dispersion value to be compensated.

[0049] Another technical solution adopted by the present invention is:

[0050] A dispersion compensation system includes:

[0051] A signal decomposition module, configured to obtain multiple signals from an input optical signal, where the spectrum of any one of the multiple signals is narrower than the spectrum of the input optical signal, and there is spectral overlap between any two of the multiple signals;

[0052] A signal processing module, configured to process the multiple signals so that at least one of the multiple signals is delayed;

[0053] A signal synthesis module, configured to synthesize the processed multiple signals to obtain an output signal;

[0054] Among them, the dispersion compensation system includes one or a combination of the following two features:

[0055] In the step of decomposing the input optical signal to obtain multiple signals, the acquisition of at least one signal among the multiple signals includes the following steps: obtaining a plurality of first narrow-spectrum optical signals according to the input optical signal, adjusting the amplitude and / or phase of the plurality of first narrow-spectrum optical signals, and obtaining at least one signal among the multiple signals according to the adjusted first narrow-spectrum optical signals;

[0056] In the step of synthesizing the processed multiple signals to obtain an output signal, the operation on at least one signal among the processed multiple signals includes the following steps: obtaining a plurality of second narrow-spectrum optical signals according to at least one signal among the processed multiple signals, adjusting the amplitude and / or phase of the plurality of second narrow-spectrum optical signals, and obtaining the output signal according to the adjusted second narrow-spectrum optical signals.

[0057] Another technical solution adopted by the present invention is:

[0058] A dispersion compensation device, comprising:

[0059] At least one processor;

[0060] At least one memory for storing at least one program;

[0061] When the at least one program is executed by the at least one processor, the at least one processor implements the above method.

[0062] Another technical solution adopted by the present invention is:

[0063] A computer-readable storage medium, in which a program executable by a processor is stored, and the executable program in the readable storage medium is used to execute the above method when executed by the processor.

[0064] The beneficial effects of the present invention are as follows: The present invention breaks through the problem that the dispersion compensation of existing optical devices is limited due to limited resolution, and improves the performance of optical-domain dispersion compensation in optical communication systems from the perspective of system design. It can not only increase the range of dispersion compensation in the optical link, but also flexibly adjust the dispersion compensation value. Description of the Drawings

[0065] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following provides an introduction to the relevant technical solution drawings in the embodiments of the present invention or the prior art. It should be understood that the drawings in the following introduction are only for conveniently and clearly presenting some embodiments of the technical solutions in the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0066] Figure 1 is a schematic structural diagram of a WSS;

[0067] Figure 2 is a schematic diagram of the dispersion compensation principle of a traditional WSS;

[0068] Figure 3 is a schematic diagram of the dispersion compensation principle in the embodiment of the present invention;

[0069] Figure 4 is a schematic structural diagram of a dispersion compensation method in the embodiment of the present invention;

[0070] Figure 5 is a schematic diagram of the first embodiment of a dispersion compensation method in the embodiment of the present invention;

[0071] Figure 6 is a schematic diagram of the second embodiment of a dispersion compensation method in the embodiment of the present invention;

[0072] Figure 7 is a schematic diagram of the third embodiment of a dispersion compensation method in the embodiment of the present invention;

[0073] Figure 8 is a schematic diagram of the fourth embodiment of a dispersion compensation method in the embodiment of the present invention;

[0074] Figure 9 is a schematic diagram of the difference between wavelength division multiplexing demultiplexing and signal decomposition of the present invention in the embodiment of the present invention;

[0075] Figure 10 is a schematic structural diagram of another dispersion compensation method in the embodiment of the present invention;

[0076] Figure 11 is the constellation diagram recovered by using the traditional WSS-based dispersion compensation method; where, Figure 11 (a) has an accumulated dispersion of 85 ps / nm, Figure 11 (b) has an accumulated dispersion of 170 ps / nm;

[0077] Figure 12 is the constellation diagram recovered by a dispersion compensation method in the embodiment of the present invention; the input optical signal is divided into 20 path signals, Figure 12(a) The cumulative dispersion is 85 ps / nm, Figure 12 (b) The cumulative dispersion is 1955 ps / nm. Detailed implementation manners

[0078] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation of the present invention. For the step numbers in the following embodiments, they are only set for the convenience of explanation and illustration, and no limitation is imposed on the order between the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0079] In the description of the present invention, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0080] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is two or more, and the understanding of greater than, less than, exceeding, etc. does not include the present number, and the understanding of above, below, within, etc. includes the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0081] In the description of the present invention, unless otherwise clearly defined, words such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0082] A dispersion compensation method based on WSS provided by the present invention will be specifically introduced. The implementation manners are only for illustration and should not be construed as a limitation of the present invention.

[0083] To clearly explain the principle of this method, first analyze the reasons for the limitations of the traditional WSS for dispersion compensation, and then give the principle of the present invention. Through the decomposition - processing - synthesis architecture, the compensation of the dispersion effect is decomposed into the compensation of the dispersion effect between multiple signals and the compensation of the dispersion effect within each signal, thereby improving the compensation ability.

[0084] The structure of the programmable WSS is as Figure 1As shown. Its basic principle is that first, the input signal (input) is decomposed into several optical signals with narrow spectra through a series of optical elements (such as mirrors and gratings). Each optical signal corresponds to a pixel on the LCoS optical processor (LCoS Optical Processor). By adjusting the refractive index of each pixel, the amplitude and phase of the optical path corresponding to this pixel can be changed. After the adjusted optical paths are combined through a series of optical elements, the output (output) is obtained. Mathematically, the narrow-spectrum optical signal corresponding to each pixel can be equivalently regarded as filtering the input optical signal with an extremely narrow optical filter Q k (ω), and each pixel can independently adjust the phase and amplitude of the optical path corresponding to it. The spectrum of the k-th optical path after adjustment can be expressed as:

[0085]

[0086] where Δω is the frequency interval between adjacent pixels, K is the total number of pixels, and α is the power attenuation coefficient used to adjust the attenuation of the optical path, is the phase, which can be adjusted by adjusting the refractive index of the pixel.

[0087] Figure 2 shows the schematic diagram of the traditional WSS dispersion compensation and the reasons for the limited compensation ability. The optical path Q k (ω) corresponding to each pixel of the WSS has a certain bandwidth. The minimum bandwidth of the current WSS device is about several GHz, and the frequency interval Δω between pixels is about 1 GHz. Theoretically, the dispersion compensation function of the input optical signal is shown in the following formula (as shown by the red dotted line in Figure 2 the above figure):

[0088]

[0089] where ω is the frequency axis representing the frequency range of dispersion compensation, and β 2 is the group velocity dispersion parameter, and L represents the distance of dispersion compensation. In order to use the WSS to achieve the dispersion compensation function, we only need to adjust the phase term of each pixel point, making:

[0090]

[0091] As shown by the blue circle in Figure 2 the above figure. Substituting Equation (3) into Equation (1) can obtain the traditional WSS-based dispersion compensation formula. In addition, the power attenuation coefficient α can also be adjusted to compensate for other impairments such as bandwidth limitation in the optical link.

[0092] From formula (3) and Figure 2It can be seen that due to the resolution limitation, the WSS can only set the phase at discrete frequency points of kΔω. In the high-frequency part of the input signal, the phase change caused by dispersion with frequency is very fast, exceeding the limit that can be characterized by the minimum frequency interval of the WSS. In addition, there is a certain bandwidth for the optical path signal corresponding to each pixel. The WSS can only set all the frequencies on this optical path to the fixed phase in formula (3), but the ideal dispersion compensation should have different phases at different frequencies of this optical path signal, that is, formula (2). This problem is more obvious in the high-frequency range of the input signal because the phase changes rapidly with frequency here, and setting all the frequencies of the optical path signal corresponding to each pixel to the same phase deviates greatly from the ideal dispersion compensation curve. To sum up, as Figure 2 shown by the blue solid line in the above figure, even if the phase of the pixel is set according to formula (3), the WSS cannot fit the dispersion compensation curve well at high frequencies. The larger the dispersion value and the baud rate, the faster the phase changes with frequency at high frequencies, and the worse the fitting ability of the WSS. Therefore, it limits the dispersion compensation ability, and the limitation becomes more serious with the increase of the baud rate.

[0093] Aiming at the limitations of traditional dispersion compensation methods, the present invention proposes a new dispersion compensation method based on multi-channel signal decomposition, which does not need to improve the resolution from the device process (such as reducing the bandwidth of the optical path signal corresponding to each pixel or Δω), and improves the dispersion compensation range of the WSS by improving at the system level.

[0094] The principle of the dispersion compensation method proposed by the present invention is described below. As Figure 3 shown, first, the input signal is decomposed into N multi-channel signals with appropriate spectral widths. For example, a 150 GHz input optical signal is divided into 15 multi-channel signals of 12 GHz each, and 20% of the spectral aliasing between multi-channel signals is considered here. In Figure 3 , N = 3. Assuming that p(t) is the time-domain expression of the prototype filter for decomposing the multi-channel signals, and its frequency-domain expression is P(ω), then the time-domain expressions of the N filters for decomposing the input optical signal into N channels can be expressed by the following formula:

[0095]

[0096] where ω 0 is the frequency interval between adjacent signals in the multi-channel signals. The frequency-domain expression corresponding to p n (t) is P n (ω), and the spectrum of the filter bank (or multi-channel signals) is as Figure 3As shown in the figure. Correspondingly, the dispersion compensation of the input optical signal can be decomposed into two parts. One part is the compensation for the dispersion effect within each decomposed signal, and the other part is the compensation for the dispersion effect between multiple signals. To obtain the expressions for compensating these two parts of the dispersion effect, we decompose the dispersion compensation function. For the nth signal in multiple signals, its dispersion compensation formula is:

[0097]

[0098] Among them, the first term in the formula is the dispersion within the nth signal in multiple signals, the second term is the delay of the nth signal relative to the 0th signal, and the third term is the phase rotation within the nth signal. We collectively refer to the first term and the third term as the dispersion effect within the nth signal, and the second term as the dispersion effect between multiple signals.

[0099] From Equation (5), we can obtain that in the process of obtaining multiple signals from the input optical signal, the acquisition of any signal can theoretically be expressed by Equation (6):

[0100]

[0101] where, P n (ω) is used to decompose the nth signal from the input optical signal, and the latter two terms are used to compensate the dispersion effect within the nth signal simultaneously. It should be noted that the compensation for the dispersion effect within the nth signal does not necessarily have to be compensated during the process of obtaining multiple signals from the input optical signal, and it can also be compensated in the subsequent synthesis step. For the sake of convenient expression, we assume in this example that the compensation for the dispersion effect within the nth signal is achieved during the decomposition process. On the other hand, the dispersion effect between multiple signals can be characterized as the delay between multiple signals:

[0102]

[0103] In practice, Equation (7) can be compensated by a delay line or a delay compensation function, where the delay time is:

[0104] t n =β 2 Lnω 0 (8)

[0105] Next, the above method for decomposing multiple signals is combined with a WSS device to further elaborate on the principle of improving the dispersion compensation ability.

[0106] Such as Figure 3As shown, the input optical signal is a signal with a relatively large frequency bandwidth, and its dispersion has rapid phase fluctuations, exceeding the limit that can be characterized by the minimum frequency interval of the WSS. In the present invention, the input optical signal is decomposed into N multiplexed signals with appropriate spectral widths. Compared with the signal before decomposition, the phase fluctuations caused by the dispersion effect in the medium-bandwidth signals are smaller and within the range that can be characterized by the WSS. Therefore, under the condition of using the same WSS device, the internal dispersion effect of the medium-bandwidth signals can be achieved by adjusting the power and phase of the narrow-spectrum optical paths corresponding to the pixels, that is, the dispersion effect compensation within each medium-bandwidth sub-band signal is similar to the traditional WSS-based dispersion compensation method. Combining Equation (1) and Equation (6), the attenuation and phase of the k-th pixel in the n-th signal can be set as:

[0107]

[0108] Through Equation (9), we can decompose the n-th signal with the internal dispersion of the signal compensated. In theory, the higher the resolution of the WSS and the narrower the physical bandwidth corresponding to each pixel, the closer the fitted decomposition filter and the internal dispersion compensation function of the signal are to the theoretical values.

[0109] Since the refractive index adjustment range of the pixels in the LCoS optical processor is limited, and the delay caused by the dispersion effect between the multiplexed signals is very large, the LCoS optical processor can only compensate the internal dispersion effect of each signal among the multiplexed signals, and the dispersion effect between the multiplexed signals requires an additional delay module for compensation. After decomposition and compensation of the internal dispersion effect of each signal, the multiplexed signals are respectively connected to the corresponding delay compensation modules, and the delay time can be calculated by Equation (8). The delay compensation module includes, but is not limited to, any one or a combination of multiple ones of optical waveguide delay, fiber delay, spatial optical delay, grating, lens, mirror, and prism.

[0110] After completing the compensation of the dispersion effect between the multiplexed signals, it is also necessary to synthesize the processed multiplexed signals together through an optical synthesis module to obtain a complete signal with the dispersion compensated.

[0111] In the above description, the internal dispersion effect of each signal among the multiplexed signals is compensated during the decomposition process. In practice, it can also be compensated during the processing process, or during the synthesis process, or a part can be compensated in any two or three steps.

[0112] Based on the above principle explanation, the present invention will be described in detail below in conjunction with the schematic diagrams of the embodiments.

[0113] Figure 4 It is a schematic diagram of a dispersion compensation structure provided by an embodiment of the present application.

[0114] The input optical signal is decomposed into multiple optical signals with medium bandwidths by an optical signal decomposition module. The optical signal decomposition module can be a 1-input N-output WSS or a programmable optical filter (waveshaper), such as Figure 5 shown. In this case, the WSS principle is adopted for obtaining any one of the multiple signals. More generally, the present invention only limits that the WSS principle is adopted for obtaining at least one signal in the step of obtaining multiple signals according to the input optical signal, or for operating at least one processed signal in the step of obtaining the output signal according to the processed optical signal. Figure 6 An embodiment is given. In this example, N = 2. First, a single-input two-output optical filter is used to decompose the signal. Here, the shape of the optical filter needs to be designed to meet the principle of no loss in the decomposition-synthesis process of the input optical signal. Traditional optical filters can be devices such as gratings and interferometers, and the adoption of the WSS principle is not limited. However, traditional optical filters (i.e., optical filters that do not adopt the WSS / waveshaper principle) cannot compensate for the dispersion effect within each signal of the multiple signals. Therefore, a single-input single-output WSS or a phase modulation unit is added to at least one path later to compensate for the dispersion effect within the signal. Optionally, as Figure 7 shown, another embodiment is to first divide the input optical signal into N signals identical to the input optical signal (only the power is different) by a 1-input N-output power splitter, and then use multiple single-input single-output WSSs or programmable optical filters to obtain the filtered signals for each path. The dispersion effect within each signal can also be compensated during this process. Figure 8 Another embodiment is given. First, a single-input multi-output optical filter is used to decompose the signal, and then phase modulation is performed on each signal to compensate for the phase shift caused by the dispersion effect within each signal.

[0115] The N decomposed optical signals are respectively connected to the corresponding N delay modules. The delay of each delay module relative to the 0th sub-band is set according to Equation (8), and the N processed optical signals are obtained after compensation for the delay.

[0116] Finally, the N processed optical signals are input into a N-input 1-output optical signal synthesis module to be synthesized into a complete optical signal. The optical signal synthesis module can be an N×1 WSS and a programmable optical filter, such as Figure 5 shown. Optionally, the synthesis module can also be a multi-input single-output traditional optical filter, such as Figure 6 shown. In this case, the synthesis module does not include functions similar to WSS. Optionally, the synthesis module can also be an N×1 coupler, such as Figure 7 shown. Optionally, as Figure 8As shown, the synthesis module may also include a function similar to that of a WSS. However, the present invention only requires that at least one of the decomposition step and the synthesis step includes a function similar to that of a WSS. The dispersion effect within each signal among the multiple signals may be included in the decomposition step, or in the synthesis step, or both. It should be noted that the WSS or the programmable optical filter in the above description is only for convenience of description. In practice, it is not limited to using a separate WSS or programmable optical filter to implement the above embodiments. The method proposed in the present invention may be implemented by an integrated optical device, which includes optical devices for implementing functions similar to those of a WSS, such as LCoS pixels.

[0117] It should be understood that the main function of the optical signal decomposition module is to divide a complete optical signal into N optical signals with medium bandwidths, and at the same time, it may also include compensation for the dispersion effect within at least one of the multiple signals; the main function of the delay module is to perform group delay on each of the optical signals with medium bandwidths respectively to compensate for the dispersion effect between the multiple signals; the main function of the optical signal synthesis module is to synthesize the decomposed N sub-band optical signals with medium bandwidths into a complete optical signal, and at the same time, it may also have compensation for the dispersion effect within at least one of the multiple signals.

[0118] It is worth noting that the optical signals with medium bandwidths described above are only for convenience of expression. The spectrum of the multiple signals in the present invention can be as fine as the optical path spectral width corresponding to each pixel, that is, only one pixel is required to represent one signal among the multiple signals. For example Figure 8 in, only one phase modulation unit is required to modulate each signal of the multiple signals. However, in practice, we need to correctly select the spectral width of the multiple signals to avoid too many signal paths, which increases the complexity.

[0119] In addition, in addition to dispersion damage, the actually input optical signal may also have other damages, such as high-frequency attenuation caused by bandwidth limitation. In the step of obtaining multiple narrow-band signals from the input optical signal, in addition to decomposing into several signals with medium bandwidths and compensating for the dispersion within the signal, compensation for such linear damages may be included. For example, for high-frequency attenuation, the amplitude of the narrow-band signal corresponding to the high frequency is set higher, while the amplitude of the narrow-band signal corresponding to the low frequency is set lower.

[0120] If the optical signal decomposition module (or optical signal synthesis module) uses prototype filters with complementary power, such as a raised cosine filter (RC), then the optical signal synthesis module (or optical signal decomposition module) may not have the function of optical filtering or use a rectangular filter with an appropriate bandwidth. That is, at this time, an optical coupler can be used to achieve the synthesis function. If the optical signal decomposition module uses prototype filters with complementary square power, such as a square root raised cosine filter (SRRC), then a corresponding matching filter should also be used in the optical signal synthesis module.

[0121] In the WSS, waveshaper, or phase modulation unit described in the embodiment, as well as the delay between multiple signals, can all be controlled by software. Thus, the dispersion to be compensated can be flexibly controlled according to the actual application scenario, improving the adaptability of the system.

[0122] The embodiment is described by taking commercial waveshaper and WSS as examples. These devices use liquid crystal on silicon (LCoS) technology. In addition to the commonly used LCoS technology, other spatial light modulator (SLM) technologies can also be used to control the amplitude and / or phase of narrow-spectrum optical signals, such as digital light processing (DLP), ferroelectric liquid crystal (FLCoS), etc.

[0123] The above embodiments assume that the input optical signal is not a wavelength division multiplexing (WDM) signal. For a WDM signal, there is no spectral aliasing between signals of different wavelengths, as Figure 9 shown. If the optical signal decomposition module is only used to separate non-aliased signals of different wavelengths, it is not included in the present invention. The feature of the present invention is that in addition to demultiplexing signals of different wavelengths, the optical signal decomposition module further decomposes any one or more channels into multiple signals with spectral aliasing between each pair, and then synthesizes them after dispersion compensation within the multiple signals and dispersion compensation between the multiple signals. In Figure 9 this case, the multiple signals described in the present invention should be understood as the multiple signals decomposed from any one channel (i.e., satisfying spectral aliasing between each pair), and corresponding embodiments are shown in Figure 10 as follows.

[0124] More generally, in addition to obtaining the multiple signals as described above, or as Figure 9 - 10 shown, obtaining the corresponding multiple signals for each wavelength signal, other signals can also be obtained. For example, a signal identical to the input optical signal can be extracted from the input optical signal for link monitoring.

[0125] To more clearly illustrate the effect of the all-optical dispersion compensation method proposed in the present invention, the performance superiority of the present invention is described below through simulation results.

[0126] Figures 11 to 12 The simulation parameters are as follows: 100 GBaud, 0.1 roll-off, 16QAM, the frequency interval of WSS is 1 GHz, the minimum bandwidth is 5 GHz, and there are two cases for the dispersion compensation method, namely the traditional WSS dispersion compensation method and the proposed method (20 channels).

[0127] By comparing Figure 11 and Figure 12 the constellation diagrams after dispersion compensation, it can be found that when the cumulative dispersion is 85 ps / nm, the constellation diagram compensated by the traditional method has significant impairment, while the noise caused by the residual dispersion of the constellation diagram compensated by the proposed method of the present invention is very small, indicating a better compensation effect. Continuing to increase the cumulative dispersion in the optical link, when the cumulative dispersion is 170 ps / nm, the noise of the constellation diagram compensated by the traditional method is very large, and the 16 constellation points can no longer be distinguished, indicating that the traditional method cannot work under this cumulative dispersion value. When the proposed method uses 20 channels, when the constellation diagram impairment is similar to Figure 11 (a), the cumulative dispersion is 1955 ps / nm, and the cumulative dispersion tolerance ability is improved by more than 10 times. Therefore, the superiority of the dispersion compensation performance of the proposed method compared with the traditional method is proved.

[0128] This embodiment also provides a dispersion compensation system, including:

[0129] A signal decomposition module, configured to obtain multiple signals according to an input optical signal, where the spectrum of any one of the multiple signals is narrower than the spectrum of the input optical signal, and there is spectral aliasing between any two of the multiple signals;

[0130] A signal processing module, configured to process the multiple signals to cause at least one of the multiple signals to be delayed;

[0131] A signal synthesis module, configured to synthesize the processed multiple signals to obtain an output signal;

[0132] Among them, the dispersion compensation system includes one or a combination of the following two features:

[0133] In the step of decomposing the input optical signal to obtain multiple signals, the acquisition of at least one of the multiple signals includes the following steps: obtaining a plurality of first narrow-spectrum optical signals according to the input optical signal, adjusting the amplitude and / or phase of the plurality of first narrow-spectrum optical signals, and obtaining at least one of the multiple signals according to the adjusted first narrow-spectrum optical signals;

[0134] In the step of synthesizing the processed multi-channel signals to obtain an output signal, the operations on at least one of the processed multi-channel signals include the following steps: obtaining a plurality of second narrow-spectrum optical signals according to at least one of the processed multi-channel signals, adjusting the amplitude and / or phase of the plurality of second narrow-spectrum optical signals, and obtaining an output signal according to the adjusted second narrow-spectrum optical signals.

[0135] A dispersion compensation system according to this embodiment can execute a dispersion compensation method provided by an embodiment of the present invention, can execute any combination of implementation steps of the method embodiment, and has the corresponding functions and beneficial effects of the method.

[0136] This embodiment also provides a dispersion compensation device, including:

[0137] At least one processor;

[0138] At least one memory for storing at least one program;

[0139] When the at least one program is executed by the at least one processor, the at least one processor implements Figure 5 The method shown.

[0140] A dispersion compensation system according to this embodiment can execute a dispersion compensation method provided by an embodiment of the present invention, can execute any combination of implementation steps of the method embodiment, and has the corresponding functions and beneficial effects of the method.

[0141] An embodiment of the present application also discloses a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device can read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes Figure 5 The method shown.

[0142] This embodiment also provides a storage medium, storing instructions or programs that can execute a dispersion compensation method shown in an embodiment of the present invention. When the instructions or programs are run, any combination of implementation steps of the method embodiment can be executed, and the corresponding functions and beneficial effects of the method are achieved. Figure 5 The method shown.

[0143] In some alternative embodiments, the functions / operations recited in the block diagrams may not occur in the order noted in the operational illustrations. For example, depending on the functionality / operation involved, two blocks shown in succession may actually be executed substantially concurrently or the blocks may sometimes be executed in reverse order. Additionally, the embodiments presented and described in the flowcharts of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is altered and in which sub-operations described as part of a larger operation are performed independently.

[0144] Furthermore, although the present invention has been described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the described functions and / or features may be integrated in a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It should also be understood that a detailed discussion of the actual implementation of each module is not necessary for an understanding of the present invention. Rather, given the attributes, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the modules will be understood within the ordinary skill of an engineer. Thus, those skilled in the art will be able to implement the present invention as set forth in the claims without undue experimentation. It should also be understood that the specific concepts disclosed are illustrative only and are not intended to limit the scope of the present invention, the scope of which is determined by the full scope of the appended claims and their equivalents.

[0145] If the described functions are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs.

[0146] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a definitional sequence of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. As used in this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

[0147] More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection part (electronic device) having one or more wirings, a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or otherwise processing as appropriate, and then storing it in a computer memory.

[0148] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0149] In the foregoing description of this specification, the descriptions with reference to the terms "one embodiment / example", "another embodiment / example", or "certain embodiments / examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0150] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

[0151] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without violating the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A dispersion compensation method, characterized in that, it includes the following steps: obtain multiple signals according to the input optical signal, wherein the spectrum of any one of the multiple signals is narrower than that of the input optical signal, and there is spectral aliasing between any two of the multiple signals; process the multiple signals so that at least one of the multiple signals is delayed; synthesize the processed multiple signals to obtain an output signal; wherein, the dispersion compensation method includes one or a combination of two of the following two features: in the step of obtaining multiple signals according to the input optical signal, the obtaining of at least one of the multiple signals includes the following steps: obtain a plurality of first narrow-spectrum optical signals according to the input optical signal, adjust the amplitude and / or phase of the plurality of first narrow-spectrum optical signals, and obtain at least one of the multiple signals according to the adjusted first narrow-spectrum optical signals; in the step of synthesizing the processed multiple signals to obtain an output signal, the operation on at least one of the processed multiple signals includes the following steps: obtain a plurality of second narrow-spectrum optical signals according to at least one of the processed multiple signals, adjust the amplitude and / or phase of the plurality of second narrow-spectrum optical signals, and obtain the output signal according to the adjusted second narrow-spectrum optical signals.

2. The dispersion compensation method according to claim 1, characterized in that, in the step of obtaining at least one of the multiple signals, the number of the first narrow-spectrum optical signals obtained according to the input optical signal is more than two; and / or; in the step of operating on at least one of the processed multiple signals, the number of the second narrow-spectrum optical signals obtained according to at least one of the processed multiple signals is more than two.

3. The dispersion compensation method according to claim 1, characterized in that, the adjustment of the amplitude and / or phase of the plurality of first narrow-spectrum optical signals includes: adjust the amplitude and / or phase of the plurality of first narrow-spectrum optical signals in a software-controlled manner; and / or; the adjustment of the amplitude and / or phase of the plurality of second narrow-spectrum optical signals includes: adjust the amplitude and / or phase of the plurality of second narrow-spectrum optical signals in a software-controlled manner.

4. The dispersion compensation method according to claim 1, characterized in that, the adjustment of the amplitude and / or phase of the plurality of first narrow-spectrum optical signals includes: adjust the amplitude and / or phase of the plurality of first narrow-spectrum optical signals in a manner of an LCoS optical processor; and / or; the adjustment of the amplitude and / or phase of the plurality of second narrow-spectrum optical signals includes: adjust the amplitude and / or phase of the plurality of second narrow-spectrum optical signals in a manner of an LCoS optical processor.

5. The dispersion compensation method according to claim 1, characterized in that, in the step of processing the multiple signals so that at least one of the multiple signals is delayed, it includes: Using any one or a combination of multiple of optical waveguide delay, fiber optic delay, spatial optical delay, grating, lens, mirror, and prism to perform delay processing on at least one of the multiplexed signals.

6. A dispersion compensation method according to claim 1, wherein, the dispersion compensation method further includes: compensating for other devices and / or transmission physical damages other than dispersion.

7. A dispersion compensation method according to claim 1, wherein, in the step of processing the multiplexed signals, the delay of at least one of the multiplexed signals has an adaptive adjustment ability.

8. A dispersion compensation system, wherein, comprising: a signal decomposition module, configured to obtain multiplexed signals according to an input optical signal, wherein the spectrum of any one of the multiplexed signals is narrower than the spectrum of the input optical signal, and there is spectral aliasing between any two of the multiplexed signals; a signal processing module, configured to process the multiplexed signals to cause at least one of the multiplexed signals to be delayed; a signal synthesis module, configured to synthesize the processed multiplexed signals to obtain an output signal; wherein, the dispersion compensation system includes one or a combination of the following two features: in the step of obtaining multiplexed signals according to the input optical signal, the obtaining of at least one of the multiplexed signals includes the following steps: obtaining a plurality of first narrow-spectrum optical signals according to the input optical signal, adjusting the amplitude and / or phase of the plurality of first narrow-spectrum optical signals, and obtaining at least one of the multiplexed signals according to the adjusted first narrow-spectrum optical signals; in the step of synthesizing the processed multiplexed signals to obtain an output signal, the operation on at least one of the processed multiplexed signals includes the following steps: obtaining a plurality of second narrow-spectrum optical signals according to at least one of the processed multiplexed signals, adjusting the amplitude and / or phase of the plurality of second narrow-spectrum optical signals, and obtaining the output signal according to the adjusted second narrow-spectrum optical signals.

9. A dispersion compensation device, wherein, comprising: at least one processor; at least one memory, configured to store at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the method according to any one of claims 1-7.

10. A computer-readable storage medium, in which a program executable by a processor is stored, wherein, the executable program in the readable storage medium is used to execute the method according to any one of claims 1-7 when executed by the processor.

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