Control circuit and method and optical module

Abstract

The invention discloses a control circuit, a control method and an optical module. The circuit comprises a comparison module, an equalization module and a light source and modulation module, wherein the comparison module is used for sending a first signal to the equalization module, the first signal is obtained by comparing signal numerical values of a plurality of positions with signal numerical values in a preset standard range by the comparison module, and the signal numerical values of the plurality of positions are signal numerical values corresponding to different time nodes in a current signal; the equalization module is used for correcting and compensating the first signal to obtain a second signal; sending the second signal to the light source and modulation module, wherein the second signal is used for controlling the light source and modulation module to perform optical power modulation; and the light source and modulation module is used for carrying out optical power modulation based on the second signal.

Description

Technical Field

[0001] The present application relates to the field of optical communications, and in particular to a control circuit, method and optical module. Background Art

[0002] In optical communication technology, an optical modulator modulates an electrical signal into an optical signal, which is then transmitted to the receiving end through an optical fiber. Under the condition that the requirements of the receiving end are met, the higher the bandwidth of the optical modulator, the higher the utilization efficiency, and the better the output optical eye diagram. However, the solutions used in related technologies to increase the bandwidth of modulators still have certain limitations, including microwave loss, inter-symbol interference, low bandwidth utilization, and high system complexity. Summary of the invention

[0003] In order to solve the above technical problems, embodiments of the present invention provide a control circuit, method and optical module.

[0004] The control circuit provided in the embodiment of the present application comprises: a comparison module, a balancing module and a light source and modulation module; wherein,

[0005] The comparison module is used to send a first signal to the equalization module, wherein the first signal is obtained by comparing the signal values ​​of multiple positions with the signal values ​​within a preset standard range by the comparison module, and the signal values ​​of the multiple positions are signal values ​​corresponding to different time nodes in the current signal;

[0006] The equalization module is used to correct and compensate the first signal to obtain a second signal; send the second signal to the light source and modulation module, and the second signal is used to control the light source and modulation module to perform optical power modulation;

[0007] The light source and modulation module are used to perform optical power modulation based on the second signal.

[0008] The control method provided in the embodiment of the present application is applied to any one of the above control circuits, and the method includes:

[0009] Compare the signal values ​​at the multiple positions with the signal values ​​within a preset standard range to obtain a first signal;

[0010] Correcting and compensating the first signal to obtain a second signal;

[0011] Optical power modulation is performed based on the second signal.

[0012] The optical module provided in the embodiment of the present application includes any one of the above-mentioned adaptive circuits.

[0013] In the technical solution of the embodiment of the present application, the control circuit includes a comparison module, an equalization module and a light source and modulation module; wherein the comparison module is used to compare the signal values ​​of multiple positions with the signal values ​​within the preset standard range to obtain a first signal, and send the first signal to the equalization module; the equalization module is used to correct and compensate the first signal to obtain a second signal, and send the second signal to the light source and modulation module; the light source and modulation module is used to modulate the optical power based on the second signal. In this way, by giving a standard signal, using a comparator to compare the standard signal with the input signal, and using the comparator to control the equalizer to correct and compensate the input signal, the modulator bandwidth can be improved while ensuring that the optical power meets the standard, and the circuit adding the equalizer can be adjusted autonomously according to the changes in the channel characteristics, which can effectively reduce inter-symbol interference and improve bandwidth utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the control circuit provided in the embodiment of the present application. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the structure of the control circuit provided in the embodiment of the present application. Figure 2 ;

[0016] Figure 3 It is a schematic diagram of the result of sampling the current signal according to the set time node provided in the embodiment of the present application;

[0017] Figure 4 It is a schematic diagram of the results before and after signal equalization in the time domain provided by an embodiment of the present application;

[0018] Figure 5 It is a flow chart of the control method provided in the embodiment of the present application;

[0019] Figure 6 is a schematic diagram of the structure of a control circuit applied to a DML Driver provided in an embodiment of the present application;

[0020] Figure 7 is a flow chart of a control method for a control circuit applied to a DML Driver provided in an embodiment of the present application;

[0021] Figure 8 is a schematic diagram of the structure of a control circuit applied to an MZM Driver provided in an embodiment of the present application;

[0022] Fig. 9 is a flow chart of a control method for a control circuit applied to an MZM Driver provided in an embodiment of the present application;

[0023] Fig.10is a schematic diagram of the structure of a control circuit applied to an EML Driver provided in an embodiment of the present application;

[0024] Fig.11 It is a flowchart of a control method for a control circuit applied to an EML Driver provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] It should be noted that in the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the embodiments of the present application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0027] To facilitate understanding of the technical solutions of the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application.

[0028] In optical communication technology, an optical modulator modulates an electrical signal into an optical signal, which is then transmitted to the receiving end through an optical fiber. Under the condition that the requirements of the receiving end are met, the higher the bandwidth of the optical modulator, the higher the utilization efficiency, and the better the output optical eye diagram. In high-speed optical communication systems, the quality of the optical eye diagram can directly reflect the quality of the system. The solutions used to increase the bandwidth of the modulator in related technologies include designing a new electrode structure to optimize the electrode parameters, or improving the substrate material, designing a new optical equalization device, or using the characteristics of the orthogonal frequency division multiplexing (OFDM) signal to flexibly modulate power allocation.

[0029] However, the scheme of improving the modulator bandwidth by improving material parameters is easily limited by the material itself. The microwave loss caused by different materials also needs to be taken into account. In addition, from the perspective of miniaturization and energy saving of communication systems, the types and sizes of available materials are limited. The scheme of improving the modulator bandwidth by modulating power allocation using the characteristics of OFDM signals has a relatively complex overall structure. Although it improves OFDM signal modulation, in actual application, due to the influence of factors such as clock offset and RF front-end nonlinearity, certain crosstalk will occur between subcarriers, reducing transmission performance. In addition, the system is relatively cumbersome and requires complex control and calculation, which increases the difficulty and cost of system implementation.

[0030] In order to solve the above technical problems, the present application proposes a circuit that uses an equalizer to improve the modulator bandwidth. By giving a standard signal, using a comparator to compare the standard signal with the input signal, and using the comparator to control the equalizer to correct and compensate the input signal, the modulator bandwidth can be improved while ensuring that the optical power meets the standard. Moreover, the circuit with the equalizer can be adjusted autonomously according to changes in channel characteristics, which can effectively reduce inter-symbol interference and improve bandwidth utilization.

[0031] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions of the present application are described in detail below through specific embodiments. The above related technologies can be combined arbitrarily with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0032] The present application embodiment provides a control circuit. Figure 1 This is a schematic diagram of the structure of the control circuit provided in the embodiment of the present application. Figure 1 ,like Figure 1 As shown, the control circuit includes: a comparison module 100, a balance module 200 and a light source and modulation module 300; wherein,

[0033] The comparison module 100 is used to send a first signal to the equalization module 200. The first signal is obtained by comparing the signal values ​​at multiple positions with the signal values ​​within a preset standard range by the comparison module 100. The signal values ​​at the multiple positions are the signal values ​​corresponding to different time nodes in the current signal.

[0034] The equalization module 200 is used to correct and compensate the first signal to obtain a second signal; send the second signal to the light source and modulation module 300, and the second signal is used to control the light source and modulation module 300 to perform optical power modulation;

[0035] The light source and modulation module 300 is used to perform optical power modulation based on the second signal.

[0036] Here, the signal values ​​at multiple positions are signal values ​​obtained by sampling the current signal at different time nodes, and the signal values ​​at multiple positions correspond to data of multiple points. The number of points of the collected data can be 5 points, 8 points, 10 points, or more, which is not limited here.

[0037] Here, the signal value within the preset standard range is the signal value corresponding to the standard signal template preset in the circuit. The standard signal template covers all code types and sets a standard range for the output result (second signal). The signal value within the standard range is the ideal signal value that needs to be achieved after modulation.

[0038] In an embodiment of the present application, the comparison signal 100 generates a first signal according to the comparison result by comparing the signal values ​​at multiple positions with the signal values ​​within a preset standard range, and sends the first signal to the balancing module 200 to control the balancing module 200 to correct and compensate the first signal to obtain a second signal. The second signal can ensure that the signal values ​​at multiple positions all fall within the preset standard range. Then the balancing module 200 sends the second signal to the light source and modulation module 300 to control the light source and modulation module 300 to perform optical power modulation based on the second signal, thereby changing the intensity of the output optical signal to ensure that the optical power meets the standard.

[0039] It should be noted that the above-mentioned first signal is a digital signal, and the equalizing module 200 can determine whether to perform correction and compensation according to the difference of the digital signal. Specifically, for the signal value of each position in the signal values ​​of multiple positions, if the signal value of the position is lower than the signal value within the preset standard range, the signal x is output, if the signal value of the position is higher than the signal value within the preset range, the signal y is output, and if the signal value of the position is within the preset standard range, the signal z is output. Correspondingly, when the equalizing module 200 receives the signal x, it will compensate the signal at the corresponding position to raise the signal value of the position; when the equalizing module 200 receives the signal y, it will weaken the signal at the corresponding position to reduce the signal value of the position; when the equalizing module 200 receives the signal z, it proves that the signal value of the corresponding position is within the preset standard range, and the equalizing module 200 will not perform any operation on the signal value of the position, and the signal value of the position remains unchanged. By analogy, when the signal values ​​of all positions receive feedback and are corrected and compensated accordingly by the equalizing module 200, it can ensure that the signal values ​​of all positions fall within the standard range.

[0040] Here, after the signal values ​​at multiple positions are compared with the signal values ​​within a preset standard range, after the signal value comparison at each position is completed, the signal output from this comparison is input into the equalization module 200, so that the equalization module 200 performs corresponding correction and compensation according to the signal output from this comparison. At this time, the first signal represents the output signal of each comparison; or after the signal values ​​at all positions are compared, the output signals are uniformly formed into a signal sequence, and the signal sequence is then input into the equalization module 200, so that the equalization module 200 performs corresponding correction and compensation according to the signals in the signal sequence in turn. At this time, the first signal represents the signal sequence.

[0041] In the technical solution of the embodiment of the present application, the control circuit includes a comparison module, an equalization module and a light source and modulation module; wherein the comparison module is used to compare the signal values ​​of multiple positions with the signal values ​​within the preset standard range to obtain a first signal, and send the first signal to the equalization module; the equalization module is used to correct and compensate the first signal to obtain a second signal, and send the second signal to the light source and modulation module; the light source and modulation module is used to modulate the optical power based on the second signal. In this way, by giving a standard signal, using a comparator to compare the standard signal with the input signal, and using the comparator to control the equalizer to correct and compensate the input signal, the modulator bandwidth can be improved while ensuring that the optical power meets the standard, and the circuit adding the equalizer can be adjusted autonomously according to the changes in the channel characteristics, which can effectively reduce inter-symbol interference and improve bandwidth utilization.

[0042] The present application also provides a control circuit. Figure 2 This is a schematic diagram of the structure of the control circuit provided in the embodiment of the present application. Figure 2 ,like Figure 2 As shown, the circuit includes: a comparison module 100, a balancing module 200, a light source and modulation module 300, a beam splitting module 400, a photoelectric conversion module 500 and an analog-to-digital conversion module 600; wherein,

[0043] The beam splitting module 400 is used to send a first optical signal to the photoelectric conversion module 500, and to send a second optical signal to the output path, wherein the first optical signal and the second optical signal are obtained by the beam splitting module 400 performing a beam splitting process on the optical signal at a preset ratio; wherein the intensity of the first optical signal is less than the intensity of the second optical signal;

[0044] The photoelectric conversion module 500 is used to send a current signal to the analog-to-digital conversion module 600, where the current signal is obtained by converting the first optical signal by the photoelectric conversion module 500;

[0045] The analog-to-digital conversion module 600 is used to send the signal values ​​of multiple positions to the comparison module 100, and the signal values ​​of the multiple positions are obtained by the analog-to-digital conversion module 600 collecting data on the current signal at different time nodes;

[0046] The comparison module 100 is used to send a first signal to the equalization module 200. The first signal is obtained by comparing the signal values ​​at multiple positions with the signal values ​​within a preset standard range by the comparison module 100. The signal values ​​at the multiple positions are the signal values ​​corresponding to different time nodes in the current signal.

[0047] The equalization module 200 is used to correct and compensate the first signal to obtain a second signal; send the second signal to the light source and modulation module 300, and the second signal is used to control the light source and modulation module 300 to perform optical power modulation;

[0048] The light source and modulation module 300 is used to perform optical power modulation based on the second signal.

[0049] In the embodiment of the present application, the beam splitting module 400 obtains a first optical signal and a second optical signal by performing beam splitting processing on the input optical signal in a preset ratio, and sends most of the second optical signal to the output path, and sends a small part of the first optical signal to the photoelectric conversion module 500; after receiving the first optical signal, the photoelectric conversion module 500 converts the first optical signal into a current signal based on the photoelectric effect, and sends the current signal to the analog-to-digital conversion module 600; after receiving the current signal, the analog-to-digital conversion module 600 samples data at multiple positions of the current signal according to the set time nodes to obtain signal values ​​at multiple positions, and sends the signal values ​​at multiple positions to the comparison module 100; after receiving the signal values ​​at multiple positions, the comparison module 100 compares the signal value of each position with the signal value within a preset standard range in turn, generates a first signal according to the comparison result, and sends the first signal to the balancing module 200; after receiving the first signal, the balancing module 200 corrects and compensates the first signal to obtain a second signal, and sends the second signal to the light source and modulation module 300; after receiving the second signal, the light source and modulation module 300 performs optical power modulation according to the second signal.

[0050] Here, when the beam splitting module 400 performs beam splitting processing on the input optical signal, its preset ratio can be adjusted accordingly according to the specific application, such as a ratio of 1:99. It should be noted that the first optical signal input to the optoelectronic conversion module 500 must be a small part of the optical signal.

[0051] Here, when the photoelectric conversion module 500 converts the first optical signal, the photoelectric conversion module 500 works based on the photoelectric effect. When the first optical signal is irradiated onto the photoelectric conversion module 500, a current is generated. Since the current is proportional to the power of the first optical signal, the power of the first optical signal can be obtained by measuring the generated current value, that is, the first optical signal can be converted into a corresponding current signal.

[0052] Here, when the analog-to-digital conversion module 600 samples the current signal, it samples the current signal at different positions according to the set time nodes, and converts the signals at multiple positions obtained by sampling into digital form to obtain signal values ​​at multiple positions, and the signal values ​​at multiple positions correspond to data at multiple points. Among them, the number of points of the collected data can be 5 points, 8 points, 10 points, etc., which are not limited here. For the sampling method, it can be uniform sampling, non-uniform sampling, multi-rate sampling, etc., which are not limited here.

[0053] For example, Figure 3 The figure shows a schematic diagram of the result of sampling the current signal according to the set time node. In this figure, the numerical values ​​corresponding to the signals at different positions are represented by the shape of an eye diagram, and 5 points of sampling are performed on it. Through data sampling, 5 data such as the low potential, high potential, cross point and intermediate value of the eye diagram can be obtained.

[0054] Here, the comparison module 100 compares the signal value of each position with the signal value within the preset standard range in turn, and when generating the first signal according to the comparison result, the first signal with different values ​​will be generated according to the different comparison results. For the signal value of each position, if the signal value of the position is lower than the signal value within the preset standard range, the signal x is output, if the signal value of the position is higher than the signal value within the preset range, the signal y is output, and if the signal value of the position is within the preset standard range, the signal z is output. Correspondingly, when the equalization module 200 receives the signal x, it will compensate the signal of the corresponding position to raise the signal value of the position; when the equalization module 200 receives the signal y, it will weaken the signal of the corresponding position to reduce the signal value of the position; when the equalization module 200 receives the signal z, it proves that the signal value of the corresponding position is within the preset standard range, and the equalization module 200 will not perform any operation on the signal value of the position, and the signal value of the position remains unchanged. By analogy, when the signal values ​​of all positions receive feedback and are corrected and compensated by the equalization module 200, it can ensure that the signal values ​​of all positions fall within the standard range.

[0055] For example, Figure 4The figure shows the result of signal equalization in the time domain before and after. It can be seen that before the signal is equalized, the waveform on the right side is distorted due to inter-symbol interference. After the signal is equalized, it is adjusted to an ideal state.

[0056] In some embodiments, the control circuit further includes: a driving module 700; the light source and modulation module 300 includes: a laser 301 and / or a modulator 302; wherein,

[0057] The driving module 700 is used to provide injection current to the laser 301;

[0058] The laser 301 is used to output an optical signal; wherein the optical signal is generated by the laser 301 after the driving module 700 performs optical power modulation on the laser 301; or the optical signal is obtained after the modulator 302 performs optical power modulation on the initial optical signal generated by the laser 301;

[0059] The modulator 302 is used to perform optical power modulation on the laser 301 based on the second signal; wherein the optical power modulation is used to change the intensity of the optical signal generated by the laser 301.

[0060] Here, the light source and modulation module 300 includes different contents according to different modulation modes. When directly modulated laser (DML) is selected as the modulation mode, the light source and modulation module 300 only includes a laser 301. When Mach-Zehnder modulator (MZM) or electro-absorption modulated laser (EML) is selected as the modulation mode, the light source and modulation module 300 includes a laser 301 and a modulator 302.

[0061] In the case where the modulation mode is DML, the light source used is usually a laser 301 under a modulation current bias. The output optical power of the DML is directly modulated by changing the injection current of the laser 301. The injection current of the laser 301 is provided by the driving module 700. In other words, the driving module 700 directly modulates the laser 301 by changing the injection current of the laser 301, so that the laser 301 outputs an optical signal under the modulation current bias. Among them, the core structure of the DML includes an active area, a waveguide, and an electrode. When the injection current changes, the carrier concentration in the active area changes, resulting in a change in the output intensity of the light.

[0062] In the case where the modulation mode is MZM, the driver 700 generates a fixed current, and the laser 301 under the fixed current bias generates an initial optical signal of constant power, which further enters the modulator 302 through the optical fiber or optical waveguide. The modulator 302 modulates the initial optical signal and outputs the modulated optical signal. Among them, the modulator 302 is an MZM, which is composed of an input / output waveguide, a Y-shaped branch including a beam splitter, two modulation arms and a Y-shaped branch including a beam combiner. Specifically, the input initial optical signal is divided into two optical signals with the same power at the Y-shaped branch including the beam splitter, and enters the upper and lower modulation arms for transmission respectively. The two modulation arms are made of electro-optical materials, and their refractive index will change with the size of the externally applied electrical signal. By applying different voltages to the upper and lower optical waveguides, the refractive index of the electro-optical crystal can be changed, thereby changing the amplitude and phase of the optical signal. Finally, the two optical signals are combined into a modulated optical signal at the Y-shaped branch including the beam combiner.

[0063] In the case where the modulation mode is EML, the modulator 302 is usually integrated in the laser 301, the driver 700 generates a fixed current, and the laser 301 under the fixed current bias generates an initial optical signal of constant power, and the initial optical signal is further modulated by the modulator 302 in the laser 301 and the modulated optical signal is output. Among them, the modulator 302 is called an electroabsorption modulator (EAM), which changes the refractive index of the material by utilizing the electroabsorption effect, thereby adjusting the intensity of the optical signal.

[0064] It should be noted that the comparison module 100 may also be a comparator 100, the balancing module 200 may also be an equalizer 200, the beam splitter module 400 may also be a beam splitter 400, the photoelectric conversion module 500 may also be a photoelectric converter 500, the analog-to-digital conversion module 600 may also be an analog-to-digital converter 600, and the driving module 700 may also be a driver 700.

[0065] In some embodiments, the first end of the beam splitter module 400 is connected to the first end of the light source and modulation module 300, the second end of the beam splitter module 400 is connected to the first end of the photoelectric conversion module 500, and the third end of the beam splitter module 400 is connected to the output path.

[0066] In some embodiments, the first end of the analog-to-digital conversion module 600 is connected to the second end of the photoelectric conversion module 500, the second end of the analog-to-digital conversion module 600 is connected to the first end of the comparison module 100, and the second end of the comparison module 100 is used to receive a first input signal, wherein the first input signal represents a signal value within a preset standard range.

[0067] In some implementations, a first terminal of the equalizing module 200 is connected to a third terminal of the comparing module 100 , and a second terminal of the equalizing module 200 is connected to a second terminal of the light source and modulation module 300 .

[0068] In some embodiments, the light source and modulation module include a laser 301 and / or a modulator 302. Specifically, the driving module 700 is connected to the first end of the laser 301, the second end of the driving module 700 is connected to the second end of the laser 301, the third end of the driving module 700 is used to receive a second input signal, and the fourth end of the driving module 700 is used to receive a third input signal.

[0069] It should be noted that the driving module 700 adopts a differential input and differential output mode, that is, the difference between the two input terminals is used as the input signal, and the difference between the two output terminals is used as the output signal to avoid signal errors. For example, the signals (the second input signal and the third input signal) received by the two input terminals (the third terminal and the fourth terminal) are V in1 and V in2 , then the actual input signal of the driving module 700 is |V in1 -V in2 |, accordingly, the signals output by the two output terminals (the first terminal and the second terminal) are V out1 and V out2 , then the actual output signal of the driving module 700 is |V out1 -V out2 The actual input signal and the actual output signal are both electrical signals. The actual output signal of the driving module 700 flows to the laser 301 and provides an injection current for the laser 301.

[0070] In the technical solution of the embodiment of the present application, the control circuit includes a comparison module, an equalization module and a light source and modulation module; wherein the comparison module is used to compare the signal values ​​of multiple positions with the signal values ​​within the preset standard range to obtain a first signal, and send the first signal to the equalization module; the equalization module is used to correct and compensate the first signal to obtain a second signal, and send the second signal to the light source and modulation module; the light source and modulation module is used to modulate the optical power based on the second signal. In this way, by giving a standard signal, using a comparator to compare the standard signal with the input signal, and using the comparator to control the equalizer to correct and compensate the input signal, the modulator bandwidth can be improved while ensuring that the optical power meets the standard, and the circuit adding the equalizer can be adjusted autonomously according to the changes in the channel characteristics, which can effectively reduce inter-symbol interference and improve bandwidth utilization.

[0071] The present application also provides a control method, which is applied to any control circuit provided in the above embodiments. Figure 5is a flow chart of the control method provided in the embodiment of the present application, such as Figure 5 As shown, the method comprises the following steps:

[0072] Step 501: Compare the signal values ​​at multiple positions with the signal values ​​within a preset standard range to obtain a first signal.

[0073] In an embodiment of the present application, the control circuit includes a comparison module 100, an equalization module 200, and a light source and modulation module 300. The comparison module 100 is used to compare each signal value of the signal values ​​of multiple positions with the signal value within the preset standard range in turn, and generate a first signal according to the comparison result. Among them, the first signal is a digital signal. Specifically, for the signal value of each position in the signal values ​​of multiple positions, if the signal value of the position is lower than the signal value within the preset standard range, then the signal x is output, if the signal value of the position is higher than the signal value within the preset range, then the signal y is output, and if the signal value of the position is within the preset standard range, then the signal z is output.

[0074] Here, the signal value within the preset standard range is the signal value corresponding to the standard signal template preset in the circuit. The standard signal template covers all code types and sets a standard range for the output result (second signal). The signal value within the standard range is the ideal signal value that needs to be achieved after modulation.

[0075] Step 502: Correct and compensate the first signal to obtain a second signal.

[0076] In an embodiment of the present application, after generating the first signal, the comparison module 100 sends the first signal to the equalization module 200 to control the equalization module 200 to correct and compensate the first signal to obtain the second signal. Among them, the second signal can ensure that the signal values ​​of multiple positions are within the preset standard range. Specifically, when the equalization module 200 receives the signal x, it will compensate the signal at the corresponding position to raise the signal value of the position; when the equalization module 200 receives the signal y, it will weaken the signal at the corresponding position to reduce the signal value of the position; when the equalization module 200 receives the signal z, it proves that the signal value of the corresponding position is within the preset standard range, and the equalization module 200 will not perform any operation on the signal value of the position, and the signal value of the position remains unchanged. By analogy, when the signal values ​​of all positions receive feedback and are corrected and compensated accordingly by the equalization module 200, it can ensure that the signal values ​​of all positions fall within the standard range.

[0077] Step 503: Perform optical power modulation based on the second signal.

[0078] In an embodiment of the present application, after generating the second signal, the equalization module 200 sends the second signal to the light source and modulation module 300 to control the light source and modulation module 300 to perform optical power modulation based on the second signal, thereby changing the intensity of the output optical signal to ensure that the optical power meets the standard.

[0079] In some embodiments, the above method further comprises:

[0080] Performing a beam splitting process of a preset ratio on the optical signal to obtain a first optical signal and a second optical signal; wherein the intensity of the first optical signal is less than the intensity of the second optical signal, and the second optical signal flows to the output path;

[0081] Converting the first optical signal to obtain a current signal;

[0082] Data of the current signal is collected at different time nodes to obtain signal values ​​at multiple locations.

[0083] Here, the control circuit further includes a beam splitter module 400, a photoelectric conversion module 500, an analog-to-digital conversion module 600, and a driving module 700. The seven modules of the comparison module 100, the equalization module 200, the light source and modulation module 300, the beam splitter module 400, the photoelectric conversion module 500, the analog-to-digital conversion module 600, and the driving module 700 form a feedback circuit structure.

[0084] Specifically, the driving module 700 provides an injection current for the light source and modulation module 300, and the light source and modulation module 300 outputs an optical signal and sends the optical signal to the beam splitting module 400; after receiving the input optical signal, the optical beam module 400 performs a preset ratio of beam splitting processing on the optical signal to obtain a first optical signal and a second optical signal, and sends most of the second optical signal to the output path, and sends a small part of the first optical signal to the photoelectric conversion module 500; after receiving the first optical signal, the photoelectric conversion module 500 converts the first optical signal into a current signal based on the photoelectric effect, and sends the current signal to the analog-to-digital conversion module 600; after receiving the current signal, the analog-to-digital conversion module 600 converts the first optical signal into a current signal according to the set time. The node samples the data of the current signal at multiple positions, obtains the signal values ​​at multiple positions, and sends the signal values ​​at multiple positions to the comparison module 100; after receiving the signal values ​​at multiple positions, the comparison module 100 compares the signal value of each position with the signal value within the preset standard range in turn, generates a first signal according to the comparison result, and sends the first signal to the equalization module 200; after receiving the first signal, the equalization module 200 corrects and compensates the first signal to obtain the second signal, and sends the second signal to the light source and modulation module 300; after receiving the second signal, the light source and modulation module 300 modulates the optical power according to the second signal, thereby changing the intensity of the output optical signal. In this way, by continuously performing feedback adjustment on the output optical signal, the optical power can meet the standard.

[0085] In some implementations, after performing optical power modulation based on the second signal, the method further includes:

[0086] Output optical signal; wherein the optical signal is generated by the laser after the driving module modulates the optical power of the laser.

[0087] Here, when the light source and modulation module 300 selects DML as the modulation mode, the light source and modulation module 300 only includes the laser 301, and the driving module 700 directly modulates the laser 301 by changing the injection current of the laser 301, so that the laser 301 outputs an optical signal under the modulation current bias.

[0088] In some implementations, performing optical power modulation based on the second signal may include:

[0089] Output an initial optical signal; wherein the initial optical signal is generated by a laser.

[0090] The initial optical signal is optically power modulated based on the second signal to obtain an optical signal.

[0091] Here, when the modulation mode of the light source and modulation module 300 is EML or MZM, the light source and modulation module 300 includes a laser 301 and a modulator 302. For the case where the modulation mode is MZM, the driver 700 generates a fixed current, and the laser 301 under the fixed current bias generates an initial optical signal of constant power, which further enters the modulator 302 through an optical fiber or an optical waveguide, and the modulator 302 modulates the initial optical signal and outputs the modulated optical signal; for the case where the modulation mode is EML, the modulator 302 is usually integrated in the laser 301, and the driver 700 generates a fixed current, and the laser 301 under the fixed current bias generates an initial optical signal of constant power, which is further modulated by the modulator 302 in the laser 301 and outputs the modulated optical signal.

[0092] Specifically, different modulation modes correspond to different application embodiments, and a specific application scenario description is given below.

[0093] Application Example 1

[0094] like Figure 6 The following is a schematic diagram of the control circuit used in DML Driver. Figure 7 The figure shows a flow chart of a control method for a control circuit applied to a DML Driver. In the application scenario of the DML Driver, the flow chart includes the following steps:

[0095] Step 701: LD emits light normally and outputs an optical signal, which is sent to a beam splitter.

[0096] Step 702: After receiving the optical signal, the beam splitter performs a 1:99 beam splitting process on the optical signal to obtain two optical signals (1% optical signal and 99% optical signal) with the original optical beam characteristics, and sends the 1% optical signal to a monitor photodiode (MPD).

[0097] Step 703: After receiving the 1% light signal, the MPD works based on the photoelectric effect. When photons with sufficient energy hit the MPD, electron holes are generated, converting the 1% light signal into a current signal, which is then sent to an analog-to-digital converter (ADC) through the MPD.

[0098] Step 704: After receiving the current signal, the ADC samples the current signal at 5 points to obtain data at multiple positions, and sends the data at multiple positions to the comparator.

[0099] Step 705: After receiving data from multiple locations, the comparator compares the data from each location with a standard value within a standard range in turn, generates an output signal according to the comparison result, and sends the output signal to an equalizer (EQ).

[0100] Step 706: After receiving the output signal, the EQ calibrates and compensates the data at the corresponding position according to the output signal, generates a standard signal, and sends the standard signal to the driver. The calibration and compensation process of the EQ can only be completed if the data at all positions are fed back and calibrated and compensated accordingly by the EQ.

[0101] Step 707: After receiving the standard signal, the driver performs optical power modulation on the LD based on the standard signal, and directly modulates the LD by changing the injection current of the LD, so that the LD outputs an optical signal under the modulation current bias.

[0102] Application Example 2

[0103] like Figure 8 The following is a schematic diagram of the control circuit used in the MZM Driver. Fig. 9 FIG. 1 is a flow chart of a control method for a control circuit of an MZM Driver. In the application scenario of the MZM Driver, the flow chart includes the following steps:

[0104] Step 901: the LD emits light normally and outputs an initial optical signal. The initial optical signal enters the MZM through an optical fiber or an optical waveguide. The MZM modulates the initial optical signal and outputs an optical signal.

[0105] Step 902: After receiving the optical signal, the beam splitter performs a 1:99 beam splitting process on the optical signal to obtain two optical signals (1% optical signal and 99% optical signal) with the original optical beam characteristics, and sends the 1% optical signal to the MPD.

[0106] Step 903: After receiving the 1% light signal, the MPD works based on the photoelectric effect. When photons with sufficient energy hit the MPD, electron holes are generated, converting the 1% light signal into a current signal, which is then sent to the ADC through the MPD.

[0107] Step 904: After receiving the current signal, the ADC samples the current signal at 5 points to obtain data at multiple positions, and sends the data at multiple positions to the comparator.

[0108] Step 905: After receiving data from multiple positions, the comparator compares the data from each position with a standard value within a standard range in turn, generates an output signal according to the comparison result, and sends the output signal to the EQ.

[0109] Step 906: After receiving the output signal, the EQ corrects and compensates the data at the corresponding position according to the output signal, generates a standard signal, and sends the standard signal to the MZM. The correction and compensation process of the EQ can only be completed if the data at all positions receive feedback and are corrected and compensated accordingly by the EQ.

[0110] Step 907: After receiving the standard signal, the MZM performs optical power modulation on the initial optical signal output by the LD based on the standard signal, and outputs the modulated optical signal.

[0111] Application Example 3

[0112] like Fig.10 The following is a schematic diagram of the control circuit used in the EML Driver. Fig.11 The figure shows a flow chart of a control method for a control circuit applied to an EML Driver. In the application scenario of the EML Driver, the flow chart includes the following steps:

[0113] Step 1101: the LD emits light normally and outputs an initial optical signal, the initial optical signal is modulated by the EAM integrated inside the LD, and the optical signal is output.

[0114] Step 1102: After receiving the optical signal, the beam splitter performs a 1:99 beam splitting process on the optical signal to obtain two optical signals (1% optical signal and 99% optical signal) with the original optical beam characteristics, and sends the 1% optical signal to the MPD.

[0115] Step 1103: After receiving the 1% light signal, the MPD works based on the photoelectric effect. When photons with sufficient energy hit the MPD, electron holes are generated, converting the 1% light signal into a current signal, which is sent to the ADC through the MPD.

[0116] Step 1104: After receiving the current signal, the ADC samples the current signal at 5 points to obtain data at multiple positions, and sends the data at multiple positions to the comparator.

[0117] Step 1105: After receiving data from multiple positions, the comparator compares the data from each position with a standard value within a standard range in turn, generates an output signal according to the comparison result, and sends the output signal to the EQ.

[0118] Step 1106: After receiving the output signal, the EQ calibrates and compensates the data at the corresponding position according to the output signal, generates a standard signal, and sends the standard signal to the EAM. The calibration and compensation process of the EQ can only be completed if the data at all positions are fed back and calibrated and compensated accordingly by the EQ.

[0119] Step 1107: After receiving the standard signal, the EAM performs optical power modulation on the initial optical signal output by the LD based on the standard signal, and outputs the modulated optical signal.

[0120] In the technical solution of the embodiment of the present application, the control circuit includes a comparison module, an equalization module and a light source and modulation module; wherein the comparison module is used to compare the signal values ​​of multiple positions with the signal values ​​within the preset standard range to obtain a first signal, and send the first signal to the equalization module; the equalization module is used to correct and compensate the first signal to obtain a second signal, and send the second signal to the light source and modulation module; the light source and modulation module is used to modulate the optical power based on the second signal. In this way, by giving a standard signal, using a comparator to compare the standard signal with the input signal, and using the comparator to control the equalizer to correct and compensate the input signal, the modulator bandwidth can be improved while ensuring that the optical power meets the standard, and the circuit adding the equalizer can be adjusted autonomously according to the changes in the channel characteristics, which can effectively reduce inter-symbol interference and improve bandwidth utilization.

[0121] An embodiment of the present application further provides an optical module, which includes any one of the control circuits provided in the above embodiments. Specifically, the control circuit is a control circuit for increasing the bandwidth of a modulator.

[0122] Any control circuit provided in the embodiments of the present application can be applied to various optical communication scenarios. Preferably, any control circuit provided in the embodiments of the present application is suitable for high-speed optical communication systems with high signal quality requirements.

[0123] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0124] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0125] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0126] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0127] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0128] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory,) ROM, random access memory (RandomAccess Memory, RAM), disk or optical disk and other media that can store program codes.

[0129] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control circuit, characterized in that: The circuit includes: a comparison module, a balance module and a light source and modulation module; wherein, The comparison module is used to send a first signal to the equalization module, wherein the first signal is obtained by the comparison module by comparing the signal values ​​of multiple positions with the signal values ​​within a preset standard range, and the signal values ​​of the multiple positions are the signal values ​​corresponding to different time nodes in the current signal; The equalization module is used to correct and compensate the first signal to obtain a second signal; send the second signal to the light source and modulation module, and the second signal is used to control the light source and modulation module to perform optical power modulation; The light source and modulation module are used to perform optical power modulation based on the second signal.

2. The circuit according to claim 1, characterized in that The circuit further includes: a beam splitting module, a photoelectric conversion module and an analog-to-digital conversion module; wherein, The beam splitting module is used to send a first optical signal to the photoelectric conversion module and send a second optical signal to the output path, wherein the first optical signal and the second optical signal are obtained by the beam splitting module performing a preset ratio of beam splitting on the optical signal; wherein the intensity of the first optical signal is less than the intensity of the second optical signal; The photoelectric conversion module is used to send a current signal to the analog-to-digital conversion module, where the current signal is obtained by the photoelectric conversion module converting the first optical signal; The analog-to-digital conversion module is used to send the signal values ​​of the multiple positions to the comparison module, and the signal values ​​of the multiple positions are obtained by the analog-to-digital conversion module performing data acquisition on the current signal at different time nodes.

3. The circuit according to claim 2, characterized in that The circuit further includes: a driving module; the light source and modulation module includes: a laser and / or a modulator; wherein, The driving module is used to provide injection current for the laser; The laser is used to output the optical signal; wherein the optical signal is generated by the laser after the driving module performs optical power modulation on the laser; or the optical signal is obtained after the modulator performs optical power modulation on the initial optical signal generated by the laser; The modulator is used to perform optical power modulation on the laser based on the second signal; wherein the optical power modulation is used to change the intensity of the optical signal generated by the laser.

4. The circuit according to claim 2, characterized in that The first end of the beam splitter module is connected to the first end of the light source and modulation module, the second end of the beam splitter module is connected to the first end of the photoelectric conversion module, and the third end of the beam splitter module is connected to the output path.

5. The circuit according to claim 2, characterized in that The first end of the analog-to-digital conversion module is connected to the second end of the photoelectric conversion module, the second end of the analog-to-digital conversion module is connected to the first end of the comparison module, and the second end of the comparison module is used to receive a first input signal, and the first input signal represents a signal value within the preset standard range.

6. The circuit according to claim 2, characterized in that The first end of the equalizing module is connected to the third end of the comparing module, and the second end of the equalizing module is connected to the second end of the light source and modulation module.

7. The circuit according to any one of claims 3 to 6, characterized in that The first end of the driving module is connected to the first end of the laser, the second end of the driving module is connected to the second end of the laser, the third end of the driving module is used to receive a second input signal, and the fourth end of the driving module is used to receive a third input signal.

8. A control method, characterized in that: Applied to the control circuit of any one of claims 1 to 7, the method comprising: Compare the signal values ​​at the multiple positions with the signal values ​​within a preset standard range to obtain a first signal; Correcting and compensating the first signal to obtain a second signal; Optical power modulation is performed based on the second signal.

9. The method according to claim 8, characterized in that The method further comprises: Performing a beam splitting process of a preset ratio on the optical signal to obtain a first optical signal and a second optical signal; wherein the intensity of the first optical signal is less than the intensity of the second optical signal, and the second optical signal flows to an output path; Converting the first optical signal to obtain a current signal; Data collection is performed on the current signal at different time points to obtain signal values ​​at multiple locations.

10. The method according to claim 8 or 9, characterized in that: After performing optical power modulation based on the second signal, the method further includes: Output the optical signal; wherein the optical signal is generated by the laser after the driving module modulates the optical power of the laser.

11. The method according to claim 8 or 9, characterized in that: The performing optical power modulation based on the second signal includes: Outputting an initial optical signal; wherein the initial optical signal is generated by a laser; The initial optical signal is optically power modulated based on the second signal to obtain the optical signal.

12. An optical module, characterized in that: The optical module comprises the control circuit according to any one of claims 1 to 7.

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