Dispersion pre-compensation device and optical communication equipment

Abstract

The invention relates to the field of optical communication, and discloses a dispersion pre-compensation device and optical communication equipment. The dispersion pre-compensation device comprises an optical domain pre-compensation module, an electric domain pre-compensation module, a dispersion measurement and analysis module and a pre-compensation signal generation module. And the optical domain pre-compensation module is configured to respond to the first pre-compensation signal and perform optical domain modulation on the to-be-modulated optical signal to obtain a first optical signal. And the electric domain pre-compensation module is configured to respond to the second pre-compensation signal, perform electric domain modulation on the first optical signal, and obtain and output a second optical signal. And the dispersion measurement and analysis module is configured to measure and analyze the second optical signal to obtain an analysis result signal. The pre-compensation signal generation module is configured to generate a first pre-compensation signal and a second pre-compensation signal based on the analysis result signal.

Description

Technical Field

[0001] The present application relates to the field of optical communications, and in particular to a dispersion precompensation device and optical communication equipment. Background Art

[0002] In optical communication technology, the dispersion problem of optical signals is one of the main factors that limit the transmission distance and reduce the transmission quality. It will cause the signal pulse to be broadened, generate inter-symbol interference, and increase the bit error rate. Therefore, how to solve the dispersion problem of optical signals is one of the keys to improving the transmission quality of optical signals.

[0003] In the related art, dispersion compensation is processed after the optical signal is transmitted, which has the disadvantages of untimely compensation, unsatisfactory effect, complex system and high cost. In addition, in the related art, dispersion pre-compensation technology still has deficiencies in accuracy, efficiency and applicability. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a dispersion pre-compensation device and an optical communication device, which can comprehensively and flexibly modulate the dispersion problem of optical signals and improve the transmission quality of optical signals.

[0005] The technical solution of the embodiment of the present application is implemented as follows:

[0006] An embodiment of the present application provides a dispersion pre-compensation device, comprising: an optical signal input module, configured to receive an optical signal to be modulated; an optical domain pre-compensation module, configured to perform optical domain modulation on the optical signal to be modulated in response to a first pre-compensation signal to obtain a first optical signal; an electrical domain pre-compensation module, configured to perform electrical domain modulation on the first optical signal in response to a second pre-compensation signal to obtain and output a second optical signal; a dispersion measurement and analysis module, configured to measure and analyze the second optical signal to obtain an analysis result signal; wherein the analysis result signal includes the dispersion amount of the second optical signal; and a pre-compensation signal generation module, configured to generate the first pre-compensation signal and the second pre-compensation signal based on the analysis result signal.

[0007] In some embodiments of the present application, the optical domain pre-compensation module includes: a micro-electromechanical system; the micro-electromechanical system is configured to adjust the delay time of multiple components in the optical signal to be modulated respectively in response to the first pre-compensation signal; wherein the multiple components in the optical signal to be modulated have different frequencies.

[0008] In some embodiments of the present application, the micro-electromechanical system includes: a plurality of variable delay lines; each of the variable delay lines transmits a corresponding component of the optical signal to be modulated; and the variable delay line is configured to adjust the length of the optical signal transmission path in response to the first pre-compensation signal, thereby adjusting the delay time of the component.

[0009] In some embodiments of the present application, the electrical domain pre-compensation module includes: an MZM modulator; the MZM modulator is configured to adjust the phase of the first optical signal in response to the second pre-compensation signal.

[0010] In some embodiments of the present application, the dispersion measurement and analysis module includes: an optical detector, configured to perform interference measurement on the second optical signal to obtain analog measurement information of the second optical signal; an analog-to-digital converter, configured to convert the measurement information of the second optical signal from analog to digital; and a digital signal processor, configured to analyze the digitized measurement information, calculate the dispersion amount of the second optical signal, and obtain the analysis result signal.

[0011] In some embodiments of the present application, the measurement information includes: spectrum information and phase information; the optical detector includes: an interference fringe generation unit, configured to generate interference fringes based on two components of the second optical signal; a spectrum measurement unit, configured to obtain the spectrum information of the second optical signal based on the interference fringes; and a phase measurement unit, configured to obtain the phase information of the second optical signal based on the interference fringes.

[0012] In some embodiments of the present application, the interference fringe generating unit includes: a beam splitter configured to split the second optical signal into a first component and a second component; a reference optical path configured to transmit the first component; a measuring optical path configured to transmit the second component; the optical path length of the measuring optical path is adjustable; and a beam combiner configured to superimpose the first component and the second component to generate the interference fringes.

[0013] In some embodiments of the present application, the spectrum measurement unit is further configured to spatially scan the interference fringes to obtain the light intensity distribution of the interference fringes; discretely sample the light intensity distribution, and convert the data obtained by the discrete sampling from the spatial domain to the frequency domain to obtain the spectrum information.

[0014] In some embodiments of the present application, the phase measurement unit is further configured to introduce a preset phase change to multiple components of the second optical signal and measure the movement distance of the interference fringes; and calculate the phase information based on the movement distance of the interference fringes and the preset phase change.

[0015] In some embodiments of the present application, the pre-compensation signal generation module includes: a programmable logic device, configured to calculate characteristic parameters based on the analysis result signal, and generate digitalized first pre-compensation signal and second pre-compensation signal; wherein the characteristic parameters include: frequency response and phase characteristics; a digital-to-analog converter, configured to convert the first pre-compensation signal and the second pre-compensation signal from digital to analog.

[0016] An embodiment of the present application also provides an optical communication device, including: a dispersion pre-compensation device as described in the above solution.

[0017] It can be seen that the dispersion pre-compensation device provided in the embodiment of the present application can simultaneously perform modulation in the electrical domain and the optical domain, so that the dispersion problem of the optical signal can be modulated more comprehensively, thereby improving the modulation effect. At the same time, the dispersion measurement and analysis module can accurately measure the output second optical signal, analyze the signal characteristics and dispersion conditions, and the pre-compensation signal generation module generates the corresponding first pre-compensation signal and second pre-compensation signal to control the modulation process in the electrical domain and the optical domain; in this way, a closed-loop feedback control is formed, which can not only improve the accuracy of the modulation, but also adjust the parameters according to various factors to adapt to different scenarios. Therefore, the embodiment of the present application can greatly improve the transmission quality of the optical signal and greatly reduce the distortion caused by dispersion.

[0018] In addition, since the dispersion pre-compensation device provided in the embodiment of the present application pre-compensates the optical signal and intervenes in the processing before the optical signal is transmitted, the dispersion pre-compensation device can be integrated at the front end of the optical communication equipment, reducing the dependence on complex back-end equipment, thereby effectively reducing costs and complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a dispersion pre-compensation device provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of the optical domain pre-compensation module provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of the MZM modulator provided in the embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of the dispersion measurement and analysis module provided in an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of an optical detector provided in an embodiment of the present application;

[0024] Figure 6A schematic diagram of the structure of an interference fringe generating unit provided in an embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of the measurement optical path provided in the embodiment of the present application;

[0026] Figure 8 A schematic diagram of the structure of a pre-compensation signal generating module provided in an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of the structure of an optical communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application are further elaborated in detail below in conjunction with the drawings and embodiments. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0029] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0030] If similar descriptions of "first / second" appear in the application documents, the following description is added. In the following description, the terms "first / second / third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first / second / third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0032] Figure 1 Schematic diagram of an optional structure of the dispersion pre-compensation device provided in the embodiment of the present application. Figure 1 As shown, the dispersion pre-compensation device includes: an optical signal input module 10, an optical domain pre-compensation module 20, an electrical domain pre-compensation module 30, a dispersion measurement and analysis module 40 and a pre-compensation signal generation module 50.

[0033] Among them, the optical signal input module 10 is configured to receive the optical signal to be modulated. The optical domain pre-compensation module 20 is configured to perform optical domain modulation on the optical signal to be modulated in response to the first pre-compensation signal to obtain a first optical signal. The electrical domain pre-compensation module 30 is configured to perform electrical domain modulation on the first optical signal in response to the second pre-compensation signal to obtain and output the second optical signal. The dispersion measurement and analysis module 40 is configured to measure and analyze the second optical signal to obtain an analysis result signal; wherein the analysis result signal includes the dispersion amount of the second optical signal. The pre-compensation signal generation module 50 is configured to generate a first pre-compensation signal and a second pre-compensation signal based on the analysis result signal.

[0034] It can be understood that the dispersion pre-compensation device provided in the embodiment of the present application can simultaneously perform modulation in the electrical domain and the optical domain, so that the dispersion problem of the optical signal can be modulated more comprehensively, thereby improving the modulation effect. At the same time, the dispersion measurement and analysis module 40 can accurately measure the output second optical signal, analyze the signal characteristics and dispersion conditions, and generate the corresponding first pre-compensation signal and second pre-compensation signal by the pre-compensation signal generation module 50 to control the modulation process in the electrical domain and the optical domain; in this way, a closed-loop feedback control is formed, which can not only improve the accuracy of the modulation, but also adjust the parameters according to various factors to adapt to different scenarios. Therefore, the embodiment of the present application can greatly improve the transmission quality of the optical signal and greatly reduce the distortion caused by dispersion.

[0035] In addition, since the dispersion pre-compensation device provided in the embodiment of the present application pre-compensates the optical signal and intervenes in the processing before the optical signal is transmitted, the dispersion pre-compensation device can be integrated at the front end of the optical communication equipment, reducing the dependence on complex back-end equipment, thereby effectively reducing costs and complexity.

[0036] In some embodiments of the present application, Figure 2 As shown, the optical domain precompensation module 20 includes: a micro-electromechanical system (MEMS) 201. The micro-electromechanical system 201 is configured to respectively adjust the delay time of multiple components in the optical signal to be modulated in response to a first pre-compensation signal; wherein the multiple components in the optical signal to be modulated have different frequencies.

[0037] In some embodiments of the present application, Figure 2 As shown, the micro-electromechanical system 201 includes: a plurality of variable delay lines. Each variable delay line transmits a corresponding component of the optical signal to be modulated. The variable delay line is configured to adjust the length of the optical signal transmission path in response to the first pre-compensation signal, thereby adjusting the delay time of the component.

[0038] In the embodiment of the present application, the variable delay line based on the micro-electromechanical system 201 is a key component of the optical domain pre-compensation module 20. These variable delay lines can accurately control the delay time of each frequency component in the optical signal to be modulated according to the signal provided by the driving unit, thereby realizing optical domain modulation and pre-compensating the dispersion of the optical signal to be modulated. Among them, the adjustment range of the delay time can be from a few picoseconds to tens of picoseconds, thereby meeting the pre-compensation requirements of different degrees of dispersion.

[0039] In the embodiment of the present application, after the optical signal to be adjusted enters the optical domain pre-compensation module 20, the variable delay line based on the micro-electromechanical system 201 starts to work. Among them, the core of the variable delay line is a micromechanical structure, such as a movable reflector, or an optical waveguide of variable length. When the optical domain pre-compensation module 20 receives the first pre-compensation signal, it will apply a voltage to the micro-electromechanical system 201 structure to move the reflector or change the length of the waveguide, thereby changing the propagation path length of the optical signal and adjusting the delay time of components of different frequencies. For components of different frequencies, different variable delay lines will perform different degrees of delay, thereby performing preliminary pre-compensation for dispersion.

[0040] In some embodiments of the present application, the electrical domain pre-compensation module 30 includes: an MZM modulator (Mach-Zehnder modulator). The MZM modulator is configured to adjust the phase of the first optical signal in response to the second pre-compensation signal.

[0041] In the present application examples, reference Figure 3 The MZM modulator is composed of two parallel optical waveguide arms L1 and L2. The optical waveguide arms L1 and L2 are optical waveguide structures with precise dimensions; the optical waveguide arms L1 and L2 are made of lithium niobate (LiNbO3) material with high electro-optic coefficient and are formed by processes such as photolithography and etching.

[0042] In the present application, continue to refer to Figure 3 By applying different voltages V (provided by the driver module) on the two optical waveguide arms L1 and L2, the phase of the optical signal can be changed. For example, the phase of the optical signal can be changed by π / 2 for every 1V voltage applied.

[0043] In the embodiment of the present application, the optical signal (i.e., the first optical signal) that has undergone optical domain modulation enters the MZM modulator. The MZM modulator generates an electro-optical effect on the optical waveguide arms L1 and L2 according to the voltage of the second pre-compensation signal, and changes the phase of the optical signal, thereby realizing electrical domain modulation of the optical signal and further pre-compensating the dispersion.

[0044] In some embodiments of the present application, Figure 4As shown, the dispersion measurement and analysis module 40 includes: an optical detector 401 , an analog-to-digital converter (ADC) 402 , and a digital signal processor (DSP) 403 .

[0045] The optical detector 401 is configured to perform interference measurement on the second optical signal to obtain measurement information of the second optical signal. The analog-to-digital converter 402 is configured to convert the measurement information of the second optical signal from analog to digital. The digital signal processor 403 is configured to analyze the digital measurement information, calculate the dispersion amount of the second optical signal, and obtain an analysis result signal.

[0046] In some embodiments of the present application, the measurement information includes: spectrum information and phase information. Figure 5 As shown, the optical detector 401 includes: an interference fringe generating unit 4011 , a spectrum measuring unit 4012 and a phase measuring unit 4013 .

[0047] The interference fringe generating unit 4011 is configured to generate interference fringes based on two components of the second optical signal. The spectrum measuring unit 4012 is configured to obtain spectrum information of the second optical signal based on the interference fringes. The phase measuring unit 4013 is configured to obtain phase information of the second optical signal based on the interference fringes.

[0048] In the embodiment of the present application, the interference fringe generating unit 4011 works based on the principle of light interference. Specifically, when two coherent light beams (with the same frequency and constant phase difference) are superimposed, interference fringes are formed. When the interference fringes are formed, light signals of different frequencies will show different distribution characteristics on the interference fringes, so that spectrum information and phase information can be obtained.

[0049] In some embodiments of the present application, Figure 6 As shown, the interference fringe generating unit 4011 includes: a beam splitter 4014 , a reference optical path 4015 , a measuring optical path 4016 and a beam combiner 4017 .

[0050] The beam splitter 4014 is configured to split the second optical signal into a first component and a second component. The reference optical path 4015 is configured to transmit the first component. The measuring optical path 4016 is configured to transmit the second component. The beam combiner 4017 is configured to superimpose the first component and the second component to generate interference fringes.

[0051] In the embodiment of the present application, the second optical signal is divided into two beams (a first component and a second component), wherein the first component passes through the reference optical path 4015, and the second component passes through the measuring optical path 4016. Since the optical path length of the measuring optical path 4016 is adjustable, the optical path difference between the reference optical path 4015 and the measuring optical path 4016 can be adjusted, so that the first component and the second component are superimposed again to generate interference fringes, thereby realizing interference measurement of the second optical signal.

[0052] In some embodiments of the present application, the beam splitter 4014 can adopt a high-quality beam splitter (such as a glass lens coated with a semi-transparent and semi-reflective film), and its splitting ratio can be precisely controlled according to design requirements, for example, a 50:50 splitting ratio, which divides the input light signal equally into two beams.

[0053] In some embodiments of the present application, the reference optical path 4015 may be designed to have a fixed length and a stable optical environment to provide a stable reference optical signal.

[0054] In some embodiments of the present application, the measurement optical path 4016 may include some adjustable optical elements. Figure 7 The measuring optical path 4016 may include a plurality of adjustable reflectors. By adjusting the adjustable reflectors, the optical path length of the measuring optical path 4016 may be changed, thereby changing the optical path difference between the reference optical path 4015 and the measuring optical path 4016 to achieve interference measurement.

[0055] In some embodiments of the present application, the spectrum measurement unit 4012 is also configured to perform spatial scanning on the interference fringes to obtain the light intensity distribution of the interference fringes; to perform discrete sampling on the light intensity distribution, and to convert the data obtained by discrete sampling from the spatial domain to the frequency domain to obtain spectrum information.

[0056] In the embodiment of the present application, after the interference fringes are formed, the second optical signals of different frequencies will present different distribution characteristics on the interference fringes. By spatially scanning the interference fringes, for example, a high-precision photodetector array can be used to scan point by point along the horizontal or vertical direction of the interference fringes, so that the light intensity distribution of the interference fringes can be obtained.

[0057] Furthermore, the light intensity distribution of the interference fringes can be discretely sampled, wherein the frequency of the discrete sampling must be high enough, for example, higher than twice the highest frequency of the optical signal, to satisfy the Nyquist sampling theorem. Then, the data obtained by discrete sampling can be Fourier transformed (such as fast Fourier transform FFT), so that the light intensity distribution can be converted from the spatial domain to the frequency domain, thereby obtaining the spectrum information of the second optical signal.

[0058] In some embodiments of the present application, the phase measurement unit 4013 is further configured to introduce a preset phase change to multiple components of the second optical signal and measure the movement distance of the interference fringes; and calculate the phase information based on the movement distance of the interference fringes and the preset phase change.

[0059] In the embodiment of the present application, the phase information can be measured by using the phase shift of the interference fringes. For example, in a Mach-Zehnder interferometer, a known phase change is introduced into one of the optical paths (such as applying a linearly varying voltage through a phase modulator to change the phase of the optical signal), and then the movement of the interference fringes is observed. Based on the distance the interference fringes move and the known phase change relationship, the phase information of the second optical signal can be calculated.

[0060] In the embodiment of the present application, the digital signal processor 403 can further analyze the phase change of the optical signal under different frequency components based on the obtained spectrum information and phase information. Since dispersion will cause different phase delays in the transmission process of optical signals of different frequencies, the dispersion amount that may be generated under different frequency components can be calculated by comparing the phase difference of different frequency components. For example, assuming that the phases of the optical signals at frequencies and are and respectively, it is known that there is a relationship between the dispersion coefficient of the transmission medium and the phase difference and the frequency difference. By calculating the dispersion coefficient between different frequency pairs, the dispersion amount distribution of the optical signal under different frequency components can be obtained.

[0061] In some embodiments of the present application, Figure 8 As shown, the pre-compensation signal generating module 50 includes: a field programmable logic device (FPGA) 501 and a digital-to-analog converter (DAC) 502 .

[0062] The programmable logic device 501 is configured to calculate characteristic parameters based on the analysis result signal to generate a digital first pre-compensation signal and a second pre-compensation signal; wherein the characteristic parameters include: frequency response and phase characteristics. The digital-to-analog converter 502 is configured to convert the first pre-compensation signal and the second pre-compensation signal from digital to analog.

[0063] In the embodiment of the present application, the programmable logic device 501 serves as the control core of the pre-compensation signal generation module 50, and implements complex signal processing logic through internal programming. A hardware description language (such as VHDL or Verilog) can be used to write programs, and these programs are downloaded to the internal memory of the programmable logic device 501. For example, based on the dispersion data obtained by the dispersion measurement and analysis module, an algorithm is written in the programmable logic device 501 to calculate the characteristic parameters of the pre-compensation signal to be generated.

[0064] The reprogrammability of the programmable logic device 501 enables it to flexibly adapt to different dispersion conditions. In different signal transmission scenarios, the generation method of the pre-compensation signal can be changed by simply modifying the program in the programmable logic device 501. For example, for different types of transmission media (such as different types and lengths of optical fibers) or different signal frequency ranges, the frequency response, phase characteristics and other parameters of the pre-compensation signal can be quickly adjusted by reconfiguring the program of the programmable logic device 501.

[0065] In the embodiment of the present application, the digital-to-analog converter 502 is a key component for converting digital signals into analog signals. In the pre-compensation signal generation module 50, the digital-to-analog converter 502 receives the digitized pre-compensation signal (including the first pre-compensation signal and the second pre-compensation signal) processed by the FPGA, and converts it into a corresponding analog electrical signal.

[0066] The resolution of the digital-to-analog converter 502 determines the accuracy of the analog signal it can output. For example, a 16-bit DAC can provide 2 16 (i.e. 65536) different voltage levels; thus, converting the pre-compensation signal from digital to analog can greatly increase the number of voltage levels and achieve more precise control.

[0067] In the embodiment of the present application, according to the dispersion amount at different frequency components calculated by the dispersion measurement and analysis module 40, the pre-compensation signal generation module 50 needs to generate an electrical signal with an opposite phase change. Assuming that the dispersion amount at a certain frequency causes the optical signal to produce a phase delay of &, then the pre-compensation signal needs to produce a phase change of & at this frequency. In a specific implementation, the programmable logic device 501 calculates the digital value of the pre-compensation signal corresponding to each frequency component based on the dispersion amount data, and then transmits these digital values ​​to the digital-to-analog converter 502. The digital-to-analog converter 502 converts these digital values ​​into analog electrical signals, and the voltage value of the analog electrical signal changes with time to form a pre-compensation signal with specific phase and amplitude characteristics.

[0068] It can be understood that the embodiments of the present application have the following advantages:

[0069] (1) Provide an efficient dispersion pre-compensation device.

[0070] Reduce signal distortion. Through precise dispersion measurement and analysis, the dispersion pre-compensation device provided in the present application can accurately grasp the dispersion that may be generated by the signal under different frequency components. Based on this, a flexible pre-compensation signal generation mechanism can offset these dispersions in a targeted manner. In practical applications, compared with traditional dispersion compensation methods, the dispersion pre-compensation device provided in the present application can reduce the distortion caused by dispersion during signal transmission by about 40% to 60%. This means that the quality of the signal has been significantly improved, whether it is the clarity, accuracy or stability of the signal, there has been a significant improvement.

[0071] Improve signal transmission quality. Efficient dispersion pre-compensation not only reduces signal distortion, but also maintains signal integrity. In high-speed optical communication scenarios, slight changes in signals may lead to loss or misinterpretation of information. The dispersion pre-compensation device provided in the present application can ensure the stability of each frequency component of the signal during transmission, so that the signal transmission quality reaches a higher level. This is of vital importance for fields with extremely high requirements on signal quality, such as high-definition video transmission, high-precision data transmission, etc.

[0072] (2) Flexible applicability.

[0073] Adapt to a variety of signal types. Different types of signals (such as optical signals with different modulation methods, signals in different frequency ranges, etc.) face different dispersion conditions during transmission. The dispersion pre-compensation device provided in the present application can change the characteristics of the pre-compensated signal by adjusting the program in the FPGA according to the specific type of the signal. For example, for high-frequency signals and low-frequency signals, the system can generate corresponding pre-compensation signals according to their respective dispersion characteristics, thereby achieving effective compensation for different types of signals.

[0074] Adapt to different transmission media and distances. Different transmission media (such as optical fibers of different materials, transmission media with different refractive indices, etc.) and the length of the transmission distance will affect the dispersion. The dispersion pre-compensation device provided in the present application can be adjusted according to these factors. In long-distance transmission, the accumulation effect of dispersion is more obvious. The system can dynamically adjust the pre-compensation signal according to the change in transmission distance to adapt to different dispersion conditions. For different transmission media, the system can generate a matching pre-compensation signal by analyzing its dispersion coefficient and other characteristics to ensure that the signal quality can be guaranteed in various transmission environments.

[0075] (3) Reduce system cost and complexity.

[0076] Reduce dependence on back-end equipment. The dispersion pre-compensation device provided by this application can be integrated in the front end of signal transmission, which means that the dependence on complex dispersion compensation equipment at the back end can be reduced in system design. Traditional dispersion compensation schemes often require the addition of specialized large-scale dispersion compensation equipment after signal transmission. These devices are not only costly, but also take up a large space. This application puts the compensation function in front, avoids the cumbersome configuration of the back-end equipment, and simplifies the architecture of the entire signal transmission system.

[0077] Compact system structure. From the perspective of the overall structure, the various modules of the dispersion precompensation device provided by the present application are tightly integrated to form an efficient whole. This compact structural design not only reduces the physical footprint of the system, but also makes the installation, commissioning and maintenance of the equipment more convenient. At the same time, due to the simplification of the system structure, the connection and collaborative work between the modules are more efficient, further improving the stability and reliability of the system and reducing the risk of failures that may arise from a complex system structure.

[0078] Fig. 9 Schematic diagram of an optional structure of an optical communication device provided in an embodiment of the present application. Fig. 9 As shown, the optical communication device 80 includes: a dispersion pre-compensation device 810. The dispersion pre-compensation device 810 has the technical features of the above-mentioned solution.

[0079] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0080] The serial numbers of the embodiments of the present application are for description only and do not represent the advantages and disadvantages of the embodiments. The methods disclosed in the several method embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments. The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments. The features disclosed in the several method or device embodiments provided in this application can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0081] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A dispersion precompensation device, characterized in that: include: An optical signal input module, configured to receive an optical signal to be modulated; an optical domain precompensation module, configured to perform optical domain modulation on the optical signal to be modulated in response to a first precompensation signal to obtain a first optical signal; an electrical domain pre-compensation module, configured to perform electrical domain modulation on the first optical signal in response to a second pre-compensation signal, to obtain and output a second optical signal; a dispersion measurement and analysis module, configured to measure and analyze the second optical signal to obtain an analysis result signal; wherein the analysis result signal includes a dispersion amount of the second optical signal; The pre-compensation signal generating module is configured to generate the first pre-compensation signal and the second pre-compensation signal based on the analysis result signal.

2. The dispersion precompensation device according to claim 1, characterized in that: The optical domain pre-compensation module includes: a micro-electromechanical system; The micro-electromechanical system is configured to respectively adjust the delay times of multiple components in the optical signal to be modulated in response to the first pre-compensation signal; wherein the multiple components in the optical signal to be modulated have different frequencies.

3. The dispersion precompensation device according to claim 2, characterized in that: The micro-electromechanical system comprises: a plurality of variable delay lines; each of the variable delay lines transmits a corresponding component of the optical signal to be modulated; The variable delay line is configured to adjust the length of the optical signal transmission path in response to the first pre-compensation signal, thereby adjusting the delay time of the component.

4. The dispersion precompensation device according to claim 1, characterized in that: The electrical domain pre-compensation module includes: an MZM modulator; The MZM modulator is configured to adjust the phase of the first optical signal in response to the second precompensation signal.

5. The dispersion precompensation device according to claim 1, characterized in that: The dispersion measurement and analysis module includes: an optical detector configured to perform interference measurement on the second optical signal to obtain analog measurement information of the second optical signal; an analog-to-digital converter, configured to convert the measurement information of the second optical signal from analog to digital; The digital signal processor is configured to analyze the digitized measurement information, calculate the dispersion amount of the second optical signal, and obtain the analysis result signal.

6. The dispersion precompensation device according to claim 5, characterized in that: The measurement information includes: spectrum information and phase information; The optical detector comprises: an interference fringe generating unit, configured to generate interference fringes based on two components of the second optical signal; a spectrum measurement unit, configured to obtain the spectrum information of the second optical signal based on the interference fringes; The phase measurement unit is configured to obtain the phase information of the second optical signal based on the interference fringes.

7. The dispersion precompensation device according to claim 6, characterized in that: The interference fringe generating unit comprises: a beam splitter configured to split the second optical signal into a first component and a second component; a reference optical path configured to transmit the first component; a measuring optical path configured to transmit the second component; the optical path length of the measuring optical path being adjustable; The beam combiner is configured to superimpose the first component and the second component to generate the interference fringes.

8. The dispersion precompensation device according to claim 6, characterized in that: The spectrum measurement unit is further configured to perform spatial scanning on the interference fringes to obtain the light intensity distribution of the interference fringes; perform discrete sampling on the light intensity distribution, and convert the data obtained by the discrete sampling from the spatial domain to the frequency domain to obtain the spectrum information.

9. The dispersion precompensation device according to claim 6, characterized in that: The phase measurement unit is further configured to introduce a preset phase change into multiple components of the second optical signal and measure the moving distance of the interference fringes; and calculate the phase information based on the moving distance of the interference fringes and the preset phase change.

10. The dispersion precompensation device according to claim 1, characterized in that: The pre-compensation signal generating module comprises: A programmable logic device is configured to calculate characteristic parameters based on the analysis result signal, and generate the first pre-compensation signal and the second pre-compensation signal in digital form; wherein the characteristic parameters include: frequency response and phase characteristics; The digital-to-analog converter is configured to convert the first pre-compensation signal and the second pre-compensation signal from digital to analog.

11. An optical communication device, characterized in that: include: The dispersion precompensation device according to any one of claims 1 to 10.

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