Optical module

Abstract

The optical module provided by the invention comprises a circuit board, a tunable laser, a DSP chip, a coherent light modulator and an MCU. A wavelength compensation rule and a temperature compensation rule are stored in the MCU, a reference voltage corresponding to the current wavelength can be obtained according to the wavelength compensation rule, a temperature compensation coefficient corresponding to the current temperature can be obtained according to the temperature compensation rule, and then a gain voltage is obtained according to the reference voltage and the temperature compensation coefficient. The gain voltage is output to the DSP chip after wavelength compensation and temperature compensation. The gain voltage is a final gain voltage value input to the DSP chip. A gain voltage is provided for a DSP chip, so that the DSP chip outputs a target modulation current, and the output optical power of an optical signal is adjusted to a target value. Optical power compensation is performed on the wavelength and the temperature at the same time, so that the influence of the wavelength and the temperature on the optical power is reduced, and the stability of the output optical power of the optical signal is further maintained.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to an optical module. Background Art

[0002] With the development of new services and application models such as cloud computing, mobile Internet, and video, the advancement of optical communication technology has become increasingly important. In optical communication technology, optical modules, as one of the key components in optical communication equipment, can realize the conversion of optical and electrical signals. In the development of optical communication technology, the data transmission rate of optical modules is required to be continuously improved.

[0003] For the coherent optical module, the control principle of the coherent optical module transmitter is that the coherent optical module passes a beam of linearly polarized light through the modulator, and then loads the data signal output by the DSP chip (Digital Signal Processing) onto the linearly polarized light to form modulated light for transmission, so that the modulated optical signal is emitted with a certain optical output power. The emitted optical power will fluctuate greatly with different working wavelengths and temperatures. Compensating for wavelength or temperature alone cannot guarantee the stability of optical power. Summary of the invention

[0004] The present application provides an optical module, which simultaneously compensates for the wavelength and temperature of the optical power to maintain the stability of the optical signal output optical power.

[0005] The optical module provided in this application includes:

[0006] Circuit boards;

[0007] A tunable laser, electrically connected to the circuit board, for emitting light of different wavelengths;

[0008] A DSP chip is electrically connected to the circuit board and is used to output a modulation current;

[0009] A coherent optical modulator is electrically connected to the tunable laser and the DSP chip, respectively, and is used to receive a modulation current output by the DSP chip, and modulate the light emitted by the tunable laser according to the modulation current to generate an optical signal;

[0010] An MCU is electrically connected to the DSP chip and is used to output different gain voltages to the DSP chip to adjust the modulation current output by the DSP chip, thereby adjusting the output optical power of the optical signal; the MCU is also used to change the refractive index of the interference arm in the coherent optical modulator by adjusting the bias current provided to the coherent optical modulator, thereby changing the phase difference between the two interference arms of the coherent optical modulator, thereby adjusting the working point of the coherent optical modulator;

[0011] The MCU is configured to: obtain a reference voltage corresponding to the current wavelength according to a wavelength compensation rule, obtain a temperature compensation coefficient corresponding to the current temperature according to a temperature compensation rule, obtain a gain voltage according to the reference voltage and the temperature compensation coefficient, and then output the gain voltage to the DSP chip.

[0012] The optical module provided in the present application includes a circuit board, a tunable laser, a DSP chip, a coherent optical modulator and an MCU. Among them, the tunable laser is used to emit light of different wavelengths. The DSP chip is used to output a modulation current. The coherent optical modulator is used to receive the modulation current output by the DSP chip, and modulate the light emitted by the tunable laser according to the modulation current, thereby generating an optical signal. The MCU is electrically connected to the DSP chip, and the MCU is used to provide different gain voltages to the DSP chip, thereby adjusting the modulation current output by the DSP chip, and then adjusting the output optical power of the optical signal; the MCU can also change the refractive index of the interference arm in the coherent optical modulator by adjusting the bias current, thereby changing the phase difference between the two interference arms of the coherent optical modulator to adjust the working point of the coherent optical modulator. Since the output optical power fluctuates with different wavelengths and temperatures, and the output optical power depends on the bias current and the modulation current, the output optical power can be adjusted by adjusting the bias current or the modulation current. In the present application, the coherent optical modulator can be maintained at the optimal operating point by adjusting the bias current. At this time, if the bias current is adjusted to adjust the output optical power, the optimal operating point of the coherent optical modulator may be offset. Based on this, the present application adjusts the gain voltage output to the DSP chip, thereby adjusting the modulation current output by the DSP chip, so as to achieve the purpose of adjusting the output optical power. At the same time, in order to perform wavelength and temperature compensation for the output optical power, the MCU stores wavelength compensation rules and temperature compensation rules respectively. According to the wavelength compensation rules, the reference voltage corresponding to the current wavelength can be obtained, and according to the temperature compensation rules, the temperature compensation coefficient corresponding to the current temperature can be obtained. Then, the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient, wherein the gain voltage is the gain voltage output to the DSP chip after wavelength compensation and temperature compensation, and the gain voltage is the final gain voltage value provided to the DSP chip. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value. In this application, by obtaining the current wavelength and the current temperature, the output optical power is wavelength compensated and temperature compensated to obtain the gain voltage, and then the gain voltage is provided to the DSP chip. At this time, the modulation current output by the DSP chip can maintain the output optical power of the optical module at the target value. This application compensates for the optical power of the wavelength and temperature at the same time, thereby reducing the influence of the wavelength and temperature on the optical power, and thus maintaining the stability of the optical signal output optical power. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the present application, the following is a brief introduction to the drawings used in some embodiments of the present application. Obviously, the drawings described below are only drawings of some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not intended to limit the actual size of the product involved in the embodiments of the present application, the actual process of the method, the actual timing of the signal, etc.

[0014] Figure 1 A partial architecture diagram of an optical communication system provided according to some embodiments of the present application;

[0015] Figure 2 A partial structural diagram of a host computer provided according to some embodiments of the present application;

[0016] Figure 3 A structural diagram of an optical module provided according to some embodiments of the present application;

[0017] Figure 4 An exploded view of an optical module provided according to some embodiments of the present application;

[0018] Figure 5 An internal structure diagram of an optical module provided according to some embodiments of the present application;

[0019] Figure 6 An internal structure diagram of a tunable laser provided according to some embodiments of the present application;

[0020] Figure 7 A structural block diagram of a circuit board in an optical module provided according to some embodiments of the present application;

[0021] Figure 8 A schematic diagram of the internal structure of an MCU provided according to some embodiments of the present application;

[0022] Fig. 9 A schematic diagram of a process in which an MCU provides a gain voltage to a DSP chip according to some embodiments of the present application;

[0023] Fig.10 The present invention is a flowchart of a method for adjusting the output optical power of an optical module provided according to some embodiments of the present application. DETAILED DESCRIPTION

[0024] In optical communication technology, in order to establish information transmission between information processing devices, it is necessary to load information onto light and use the propagation of light to achieve information transmission. Here, the light loaded with information is an optical signal. When optical signals are transmitted in information transmission equipment, the loss of optical power can be reduced, so high-speed, long-distance, and low-cost information transmission can be achieved. The signals that information processing equipment can recognize and process are electrical signals. Information processing equipment usually includes optical network terminals (Optical Network Unit, ONU), gateways, routers, switches, mobile phones, computers, servers, tablets, televisions, etc., and information transmission equipment usually includes optical fibers and optical waveguides.

[0025] The optical module can realize the mutual conversion between optical signals and electrical signals between information processing equipment and information transmission equipment. For example, at least one of the optical signal input end or the optical signal output end of the optical module is connected to an optical fiber, and at least one of the electrical signal input end or the electrical signal output end of the optical module is connected to an optical network terminal; the first optical signal from the optical fiber is transmitted to the optical module, and the optical module converts the first optical signal into a first electrical signal, and transmits the first electrical signal to the optical network terminal; the second electrical signal from the optical network terminal is transmitted to the optical module, and the optical module converts the second electrical signal into a second optical signal, and transmits the second optical signal to the optical fiber. Since multiple information processing devices can transmit information through electrical signals, at least one of the multiple information processing devices needs to be directly connected to the optical module, and all information processing devices do not need to be directly connected to the optical module. Here, the information processing device directly connected to the optical module is called the upper computer of the optical module. In addition, the optical signal input end or the optical signal output end of the optical module can be called an optical port, and the electrical signal input end or the electrical signal output end of the optical module can be called an electrical port.

[0026] Figure 1 FIG. 1 is a partial architecture diagram of an optical communication system provided according to some embodiments of the present application. Figure 1 As shown, the optical communication system mainly includes a remote information processing device 1000 , a local information processing device 2000 , a host computer 100 , an optical module 200 , an optical fiber 101 and a network cable 103 .

[0027] One end of the optical fiber 101 extends toward the remote information processing device 1000, and the other end of the optical fiber 101 is connected to the optical module 200 through the optical port of the optical module 200. The optical signal can be totally reflected in the optical fiber 101, and the propagation of the optical signal in the total reflection direction can almost maintain the original optical power. The optical signal undergoes multiple total reflections in the optical fiber 101 to transmit the optical signal from the remote information processing device 1000 to the optical module 200, or to transmit the optical signal from the optical module 200 to the remote information processing device 1000, thereby realizing long-distance, low-power loss information transmission.

[0028] The optical communication system may include one or more optical fibers 101, and the optical fibers 101 are detachably connected or fixedly connected to the optical module 200. The host computer 100 is configured to provide data signals to the optical module 200, receive data signals from the optical module 200, or monitor or control the working state of the optical module 200.

[0029] The host computer 100 includes a substantially rectangular housing and an optical module interface 102 disposed on the housing. The optical module interface 102 is configured to connect to the optical module 200 so that the host computer 100 and the optical module 200 establish a unidirectional or bidirectional electrical signal connection.

[0030] The host computer 100 also includes an external electrical interface, which can be connected to an electrical signal network. For example, the external electrical interface includes a Universal Serial Bus (USB) interface or a network cable interface 104, and the network cable interface 104 is configured to access the network cable 103 so that the host computer 100 establishes a unidirectional or bidirectional electrical signal connection with the network cable 103. One end of the network cable 103 is connected to the local information processing device 2000, and the other end of the network cable 103 is connected to the host computer 100, so as to establish an electrical signal connection between the local information processing device 2000 and the host computer 100 through the network cable 103. For example, the third electrical signal sent by the local information processing device 2000 is transmitted to the host computer 100 through the network cable 103, and the host computer 100 generates a second electrical signal according to the third electrical signal. The second electrical signal from the host computer 100 is transmitted to the optical module 200, and the optical module 200 converts the second electrical signal into a second optical signal, and transmits the second optical signal to the optical fiber 101, and the second optical signal is transmitted to the remote information processing device 1000 in the optical fiber 101. For example, the first optical signal from the remote information processing device 1000 is transmitted through the optical fiber 101, and the first optical signal from the optical fiber 101 is transmitted to the optical module 200, and the optical module 200 converts the first optical signal into a first electrical signal, and the optical module 200 transmits the first electrical signal to the host computer 100, and the host computer 100 generates a fourth electrical signal according to the first electrical signal, and transmits the fourth electrical signal to the local information processing device 2000. It should be noted that the optical module is a tool for realizing the mutual conversion between optical signals and electrical signals. During the conversion process between the optical signals and electrical signals, the information does not change, but the encoding and decoding methods of the information can change.

[0031] In addition to the optical network terminal, the host computer 100 also includes an optical line terminal (OLT), an optical network device (ONT), or a data center server.

[0032] Figure 2 1 is a partial structural diagram of a host computer according to some embodiments of the present application. In order to clearly show the connection relationship between the optical module 200 and the host computer 100, Figure 2 Only the structure of the host computer 100 related to the optical module 200 is shown. Figure 2 As shown, the host computer 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on the surface of the PCB circuit board 105, a heat sink 107 disposed on the cage 106, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access the electrical port of the optical module 200; the heat sink 107 has a protruding structure such as fins to increase the heat dissipation area.

[0033] The optical module 200 is inserted into the cage 106 of the host computer 100, and the cage 106 fixes the optical module 200. The heat generated by the optical module 200 is transferred to the cage 106 and then diffused through the heat sink 107. After the optical module 200 is inserted into the cage 106, the electrical port of the optical module 200 is connected to the electrical connector inside the cage 106, so that the optical module 200 establishes a bidirectional electrical signal connection with the host computer 100. In addition, the optical port of the optical module 200 is connected to the optical fiber 101, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101.

[0034] Figure 3 is a structural diagram of an optical module provided according to some embodiments of the present application, Figure 4 FIG. 1 is an exploded view of an optical module provided according to some embodiments of the present application. Figure 3 and Figure 4 As shown, the optical module 200 includes a shell, a circuit board 300 disposed in the shell, a tunable laser 900 , a coherent optical component 1100 and a DSP chip 1200 .

[0035] The housing comprises an upper housing 201 and a lower housing 202 . The upper housing 201 covers the lower housing 202 to form the housing having two openings 204 and 205 . The outer contour of the housing is generally a square body.

[0036] In some embodiments, the lower shell 202 includes a bottom plate 2021 and two lower side plates 2022 located on both sides of the bottom plate 2021 and arranged perpendicular to the bottom plate 2021; the upper shell 201 includes a cover plate 2011, and the cover plate 2011 covers the two lower side plates 2022 of the lower shell 202 to form the above-mentioned shell.

[0037] In some embodiments, the lower shell 202 includes a bottom plate 2021 and two lower side plates 2022 located on both sides of the bottom plate 2021 and vertically arranged with the bottom plate 2021; the upper shell 201 includes a cover plate 2011 and two upper side plates located on both sides of the cover plate 2011 and vertically arranged with the cover plate 2011, and the two upper side plates are combined with the two lower side plates 2022 to realize that the upper shell 201 covers the lower shell 202.

[0038] The direction of the line connecting the two openings 204 and 205 may be consistent with the length direction of the optical module 200, or may be inconsistent with the length direction of the optical module 200. For example, the opening 204 is located at the end of the optical module 200 ( Figure 3 The opening 205 is also located at the end of the optical module 200 ( Figure 3 Alternatively, the opening 204 is located at the end of the optical module 200, and the opening 205 is located at the side of the optical module 200. The opening 204 is an electrical port, and the gold finger 301 of the circuit board 300 extends from the opening 204 and is inserted into the electrical connector of the host computer 100; the opening 205 is an optical port, which is configured to access the external optical fiber 101, so that the optical fiber 101 is connected to the tunable laser 900 and the coherent optical component 1100 in the optical module 200.

[0039] The upper housing 201 and the lower housing 202 are combined to facilitate the installation of the circuit board 300, the tunable laser 900, the coherent optical component 1100, etc. into the above housing, and the upper housing 201 and the lower housing 202 can encapsulate and protect the above components. In addition, when assembling the circuit board 300, the tunable laser 900, the coherent optical component 1100, etc., it is convenient to deploy the positioning components, heat dissipation components, and electromagnetic shielding components of these components, which is conducive to the automated production.

[0040] In some embodiments, the upper shell 201 and the lower shell 202 are made of metal materials to facilitate electromagnetic shielding and heat dissipation.

[0041] In some embodiments, the optical module 200 further includes an unlocking component 600 located outside its housing. The unlocking component 600 is configured to achieve a fixed connection between the optical module 200 and the host computer, or to release the fixed connection between the optical module 200 and the host computer.

[0042] For example, the unlocking component 600 is located on the outside of the two lower side plates 2022 of the lower housing 202, and includes a snap-fit ​​component that matches the cage 106 of the host computer 100. When the optical module 200 is inserted into the cage 106, the snap-fit ​​component of the unlocking component 600 fixes the optical module 200 in the cage 106; when the unlocking component 600 is pulled, the snap-fit ​​component of the unlocking component 600 moves accordingly, thereby changing the connection relationship between the snap-fit ​​component and the host computer, so as to release the fixation of the optical module 200 and the host computer, so that the optical module 200 can be pulled out of the cage 106.

[0043] The circuit board 300 includes circuit traces, electronic components and chips, etc. The electronic components and chips are connected according to the circuit design through the circuit traces to realize the functions of power supply, electrical signal transmission and grounding. The electronic components may include capacitors, resistors, transistors, metal-oxide-semiconductor field-effect transistors (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), etc. The chips may include microcontroller units (Microcontroller Unit, MCU), laser driver chips, transimpedance amplifiers (Transimpedance Amplifier, TIA), limiting amplifiers (Limiting amplifier), clock and data recovery chips (Clock and Data Recovery, CDR), power management chips, digital signal processing (Digital Signal Processing, DSP) chips.

[0044] The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize the load-bearing function. For example, the rigid circuit board can stably carry the above-mentioned electronic components and chips; the rigid circuit board can also be inserted into the electrical connector in the cage 106 of the host computer 100.

[0045] The circuit board 300 also includes a gold finger 301 formed on the end surface thereof. The gold finger 301 is composed of a plurality of independent pins. The circuit board 300 is inserted into the cage 106, and the gold finger 301 is connected to the electrical connector in the cage 106. The gold finger 301 can be provided on only one side of the circuit board 300 (e.g. Figure 4The upper surface shown in the figure) can also be set on the upper and lower surfaces of the circuit board 300 to provide more pins, so as to adapt to occasions where the number of pins is large. The gold finger 301 is configured to establish an electrical connection with the host computer to achieve power supply, grounding, two-wire synchronous serial (Inter-Integrated Circuit, I2C) signal transmission, data signal transmission, etc. Of course, flexible circuit boards are also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards to supplement rigid circuit boards.

[0046] Figure 5 FIG. 1 is an internal structure diagram of an optical module provided according to some embodiments of the present application. Figure 5 As shown, in some embodiments, a tunable laser 900, a coherent optical component 1100 and a DSP chip 1200 are respectively provided on the surface of the circuit board 300. The coherent optical component 1100 includes a coherent optical modulator inside, and the coherent optical modulator is used to modulate the optical signal. Exemplarily, the coherent optical modulator is a silicon-based coherent optical modulator or a thin-film lithium niobate-based coherent optical modulator.

[0047] The tunable laser 900 is used as an external light source of the coherent light modulator. The tunable laser 900 emits light from the side, and the light it emits enters the coherent light modulator. Exemplarily, the tunable laser 900 can output light of different wavelengths.

[0048] The host computer transmits the electrical signal to the DSP chip 1200 through the gold finger 301. In some embodiments, the optical signal may be distorted during the transmission process of the optical fiber link. In the above embodiments of the present application, the DSP chip 1200 is used to combat and compensate for the distortion, thereby reducing the impact of the distortion on the system bit error rate. The DSP chip 1200 can perform various signal compensation processes, such as chromatic dispersion compensation and polarization mode dispersion compensation. Exemplarily, the DSP chip 1200 converts the 16-channel PAM-4 electrical signal emitted by the host computer into four-channel transmitting end PAM-4 electrical signals, and the coherent optical modulator modulates the received four-channel PAM-4 electrical signal onto the light emitted by the tunable laser 900, thereby generating a transmitting optical signal.

[0049] Figure 6 FIG. 1 is an internal structure diagram of a tunable laser provided according to some embodiments of the present application. Figure 6As shown, in some embodiments, the tunable laser 900 includes a package cavity, and the interior of the package cavity includes a gain chip 910, a lens 920, a wavelength selection component, a phase shifter 940, and a reflector 960. Exemplarily, the wavelength selection component includes a first filter and a second filter, such as a first etalon 930 and a second etalon 950. In some embodiments, when the first etalon 930 and the second etalon 950 are heated to different temperatures, the tunable laser 900 can output light of different wavelengths.

[0050] In some embodiments, carriers are injected into the gain chip 910, and the gain chip 910 emits light of a wide wavelength range according to the carriers, and then specific currents are respectively input into the first etalon 930 and the second etalon 950 to heat the first etalon 930 and the second etalon 950 to a specific temperature, so that light of a specific wavelength can be screened out from the wide spectrum light to achieve wavelength selection. By providing currents of different magnitudes to the wavelength selection component to perform temperature tuning on the wavelength selection component, wavelength tuning is achieved.

[0051] The light emitted by the gain chip 910 is divergent light, so the divergent light beam emitted by the gain chip 910 is collimated into a parallel light beam through the lens 920, and then enters the first etalon 930 in the form of parallel light. Through the combination of the first etalon 930 and the second etalon 950, the wavelength that can pass through both of them is screened out. Specifically, by heating the first etalon 930 and the second etalon 950 respectively, the required wavelength (target wavelength) can be selected through the vernier effect of the two.

[0052] The first etalon 930 and the second etalon 950 are arranged at an interval to form a vernier etalon. The FSR (Freespectral range) of the two etalons is different. Based on the vernier principle, the light waves in the common passable wavelength band of the first etalon 930 and the second etalon 950 can be screened out, that is, when a wavelength in the transmission spectra of the two etalons coincides (i.e., is aligned), the light of the specific wavelength can be selected.

[0053] In some embodiments, by heating the first standard tool 930 and the second standard tool 950 to different temperatures, the refractive indices of the two standards change accordingly, and then the optical paths of the two standards change, and the cavity length of the resonant cavity changes accordingly, and the wavelengths selected by the two standards change, thereby outputting light of different wavelengths to achieve wavelength tuning.

[0054] In some embodiments, the resonant cavity of the tunable laser 900 is relatively long, and there are many cavity modes that may oscillate. The filter transmission spectrum allows only one of the cavity modes to have a lower loss and form a laser oscillation output. Since the cavity mode is easily drifted due to the influence of temperature, stress, etc., and the output wavelength is related to the cavity mode, which causes the output wavelength to drift, it is necessary to lock the specific wavelength selected by the wavelength selection component. In some embodiments, by changing the temperature of the phase shifter 940 to change the refractive index of the phase shifter 940, the optical length of the phase shifter 940 is changed, and then the cavity length of the resonant cavity is changed to lock the cavity length of the resonant cavity, and correspondingly lock the cavity mode of the resonant cavity, and then lock the wavelength.

[0055] In some embodiments, one end face of the gain chip 910 serves as the first resonant end face of the resonant cavity of the tunable laser 900, and the reflector 960 serves as the second resonant end face of the resonant cavity. The first resonant end face and the second resonant end face constitute a resonant cavity. The resonant cavity has a laser mode wavelength (i.e., resonant wavelength) supported by it. The laser mode can be a longitudinal mode or a transverse mode. The laser mode wavelength is related to the length of the resonant cavity. When the current wavelength is the laser mode wavelength supported by the resonant cavity, the light of the current wavelength can oscillate in the resonant cavity to obtain a positive net gain, and finally form a laser output. When the current wavelength is not the wavelength supported by the resonant cavity, the light cannot oscillate in the resonant cavity and eventually disappears in the resonant cavity. By tuning the temperature of the wavelength selection component and tuning the length of the resonant cavity to the resonant cavity length corresponding to the light of a specific wavelength (i.e., the target wavelength), the light of the specific wavelength selected by the wavelength selection component reflects and oscillates back and forth in the resonant cavity. When the gain is equal to the loss, the spontaneous emission is converted into stimulated emission, thereby forming a laser output.

[0056] In some embodiments, a bias current is provided to the coherent light modulator by a bias current source. The MCU adjusts the bias current provided to the coherent light modulator by controlling the bias current source. Exemplarily, the coherent light modulator is an MZ modulator, and the modulation region of the coherent light modulator includes two interference arms. By adjusting the bias current output to the coherent light modulator, the refractive index of the interference arm in the coherent light modulator can be changed, thereby changing the phase difference between the two interference arms in the coherent light modulator to adjust the operating point of the coherent light modulator. Exemplarily, by adjusting the bias current output to the coherent light modulator, the phase difference between the two interference arms in the coherent light modulator is adjusted to π / 2, and the coherent light modulator is at an optimal operating point.

[0057] In some embodiments, the MCU outputs a gain voltage to the DSP chip 1200, and the DSP chip 1200 outputs a modulation current under the effect of the gain voltage, thereby providing a modulation current to the coherent optical modulator. The modulation current output by the DSP chip 1200 is an AC signal, and illustratively, the modulation current output by the DSP chip 1200 is a differential signal. The coherent optical modulator modulates the light emitted by the tunable laser according to the modulation current, thereby generating an optical signal. Exemplarily, the coherent optical modulator performs intensity modulation on the light emitted by the tunable laser according to the modulation current, thereby generating an optical signal. When the MCU outputs different gain voltages to the DSP chip 1200, the signal amplitude of the modulation current output by the corresponding DSP chip changes, thereby providing different modulation currents to the coherent optical modulator.

[0058] The output optical power of the optical signal will fluctuate with different wavelengths and temperatures. For example, when the temperature is low, the emission optical power of the coherent optical module is high, and when the temperature is high, the emission optical power of the coherent optical module is low; for another example, the larger the wavelength, the higher the emission optical power of the coherent optical module, and the smaller the wavelength, the lower the emission optical power of the coherent optical module; this leads to inconsistent output optical power, making it difficult to ensure the stability of the output optical power.

[0059] The output optical power depends on the bias current and the modulation current, so the output optical power can be adjusted by adjusting the bias current or the modulation current. In the present application, the coherent optical modulator can be maintained at the optimal operating point by adjusting the bias current. At this time, if the output optical power is adjusted by adjusting the bias current, the optimal operating point of the coherent optical modulator may be offset. Based on this, the present application adjusts the gain voltage output to the DSP chip 1200, thereby adjusting the modulation current output by the DSP chip 1200, so as to achieve the purpose of adjusting the output optical power. At the same time, in order to perform wavelength and temperature compensation for the output optical power, the MCU stores wavelength compensation rules and temperature compensation rules respectively. According to the wavelength compensation rules, the reference voltage corresponding to the current wavelength can be obtained, and according to the temperature compensation rules, the temperature compensation coefficient corresponding to the current temperature can be obtained. Then, the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient, wherein the gain voltage is the gain voltage output to the DSP chip 1200 after wavelength compensation and temperature compensation, and the gain voltage is the final gain voltage value provided to the DSP chip 1200. The present application provides a gain voltage to the DSP chip 1200 so that the DSP chip 1200 outputs a target modulation current, thereby adjusting the output optical power of the optical signal to a target value. In the present application, the gain voltage is obtained by obtaining the current wavelength and the current temperature, and then performing wavelength compensation and temperature compensation on the output optical power, thereby obtaining the gain voltage, and then providing the gain voltage to the DSP chip. At this time, the modulation current output by the DSP chip can maintain the output optical power of the optical module at the target value.

[0060] Figure 7This is a block diagram of a circuit board in an optical module according to some embodiments of the present application. In some embodiments, the tunable laser 900 outputs light of different wavelengths to the coherent optical modulator. The DSP chip 1200 outputs a modulation current to the coherent optical modulator. The coherent optical modulator modulates the light emitted by the tunable laser 900 according to the modulation current, such as intensity modulation, to achieve modulation of the optical signal. Exemplarily, a power detector is provided on the output optical path of the optical signal to detect the output optical power of the optical signal.

[0061] In some embodiments, when the MCU outputs different gain voltages to the DSP chip 1200, the signal amplitude of the modulation current output by the corresponding DSP chip changes, thereby providing different modulation currents to the coherent optical modulator, and finally adjusting the output optical power. In the present application, by adjusting the gain voltage output to the DSP chip 1200, the modulation current output by the DSP chip 1200 is adjusted, which can meet the requirements of wavelength compensation and temperature compensation for the output optical power, and because the modulation current is an alternating signal, it is more conducive to improving the signal quality of the optical signal.

[0062] In some embodiments, at a fixed temperature and a fixed wavelength, the power detector detects the optical power, then compares the optical power detection value with a threshold, and reports the comparison result to the MCU, and the MCU adjusts the gain voltage output to the DP chip 1200 according to the reported value, thereby adjusting the output optical power. Exemplarily, at normal temperature and medium wavelength, the detection value is compared with the threshold, and the comparison result is reported to the MCU.

[0063] Figure 8 Schematic diagram of the internal structure of an MCU provided according to some embodiments of the present application. Figure 8 As shown, in some embodiments, in order to perform wavelength compensation and temperature compensation on the output optical module respectively, the MCU stores a first register and a second register respectively. Exemplarily, the first register stores wavelength compensation rules; the second register stores temperature compensation rules.

[0064] In some embodiments, the output optical power is affected by wavelength and temperature, so the present application compensates the output optical power according to wavelength compensation rules and temperature compensation rules, respectively, and outputs a gain voltage after wavelength compensation and temperature compensation to the DSP chip 1200, so that the DSP chip 1200 outputs a target modulation current, and the output optical power can be stabilized according to the target modulation current. Exemplarily, the gain voltage after wavelength compensation and temperature compensation is output to the DSP chip 1200, so that the output optical power is adjusted to the target value.

[0065] In some embodiments, the first register stores wavelength compensation rules. Exemplarily, the wavelength compensation rules include the gain voltage output to the DSP chip 1200 corresponding to the output optical power of the optical signal at different wavelengths at a preset temperature when it is adjusted to the target value. Exemplarily, the preset temperature is room temperature, and the corresponding gain voltage in the wavelength compensation rule is: the gain voltage output to the DSP chip 1200 corresponding to the output optical power of the optical signal at room temperature and at each wavelength when it is adjusted to the target value. For the convenience of description, in the wavelength compensation rule, the gain voltage corresponding to each wavelength is called a reference voltage. Therefore, the wavelength compensation rule includes the reference voltage corresponding to each wavelength at a preset temperature. The reference voltage corresponding to each wavelength can be queried through the wavelength compensation rule. The reference voltage is the gain voltage output value corresponding to the wavelength compensation. In some embodiments, the second register stores temperature compensation rules. Exemplarily, the temperature compensation rule includes the temperature compensation coefficient corresponding to each temperature at a preset wavelength. Exemplarily, the temperature compensation coefficient refers to: the ratio between the gain voltage output to the DSP chip 1200 corresponding to the output optical power of the optical signal at the current temperature at a preset wavelength and the reference gain voltage. Among them, the reference gain voltage is: the gain voltage output to the DSP chip 1200 corresponding to when the output optical power of the optical signal is adjusted to the target value under the preset temperature and preset wavelength, wherein the preset temperature can be room temperature and the preset wavelength can be medium wave. It can be understood that the "preset temperature" mentioned in this application refers to room temperature and the "preset wavelength" refers to medium wave. Of course, other temperatures and other wavelengths can also be used respectively. The temperature compensation coefficient corresponding to each temperature can be queried through the temperature compensation rule.

[0066] In some embodiments, the current wavelength and the current temperature are obtained, and then the reference voltage corresponding to the current wavelength is obtained according to the wavelength compensation rule, and the temperature compensation coefficient corresponding to the current temperature is obtained according to the temperature compensation rule, and then the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient. The gain voltage is the gain voltage output to the DSP chip 1200 after wavelength compensation and temperature compensation are performed respectively. It can be understood that the reference voltage only represents the gain voltage output value corresponding to the wavelength compensation. If temperature compensation is performed later, the reference voltage is not the final gain voltage provided to the DSP chip 1200, and the gain voltage is the final gain voltage provided to the DSP chip 1200; if only wavelength compensation is performed and temperature compensation is not performed later, the reference voltage is the final gain voltage provided to the DSP chip 1200.

[0067] The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to the target value. In the present application, the current wavelength and the current temperature are obtained, and then the wavelength compensation and temperature compensation of the output optical power are performed to obtain the gain voltage, and then the gain voltage is provided to the DSP chip. At this time, the modulation current output by the DSP chip can maintain the output optical power of the optical module at the target value.

[0068] In some embodiments, the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient, including: the reference voltage is multiplied by the temperature compensation coefficient to obtain the gain voltage. The gain voltage is the gain voltage value corresponding to wavelength compensation and temperature compensation. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0069] In some embodiments, a temperature sensor is provided in the MCU to collect the current temperature. The MCU is also electrically connected to the tunable laser 900 to obtain the current wavelength output by the tunable laser 900.

[0070] In some embodiments, the generation of wavelength compensation rules includes:

[0071] The gain voltage output to the DSP chip 1200 is adjusted at the preset temperature and the first wavelength to adjust the output optical power of the optical signal to the target value, and the current gain voltage is recorded as the initial value of the gain voltage. Exemplarily, the preset temperature is room temperature, and the first wavelength is medium wave.

[0072] The gain voltage output to the DSP chip 1200 is adjusted at the preset temperature and the second wavelength to adjust the output optical power of the optical signal to the target value, and obtain a first ratio, wherein the first ratio is the ratio between the current gain voltage and the initial value of the gain voltage.

[0073] The gain voltage output to the DSP chip 1200 is adjusted at the preset temperature and the third wavelength to adjust the output optical power of the optical signal to the target value, and obtain a second ratio, wherein the second ratio is the ratio between the current gain voltage and the initial value of the gain voltage.

[0074] The relationship between the reference voltage and the wavelength is fitted according to the first ratio and the second ratio, and a wavelength compensation rule is generated. Exemplarily, the wavelength compensation rule is a corresponding relationship table between each wavelength and the reference voltage.

[0075] The wavelength compensation rule in the present application includes the reference voltage corresponding to each wavelength at a preset temperature. The reference voltage corresponding to each wavelength can be queried through the wavelength compensation rule. The reference voltage is the gain voltage output value corresponding to the wavelength compensation.

[0076] In some embodiments, the generation of temperature compensation rules includes:

[0077] The gain voltage output to the DSP chip 1200 is adjusted at a preset wavelength and a first temperature to adjust the output optical power of the optical signal to a target value, and the current gain voltage is recorded as a reference gain voltage. For example, the preset wavelength is a medium wave, and the first temperature is a normal temperature.

[0078] The gain voltage output to the DSP chip 1200 is adjusted at the preset wavelength and the second temperature to adjust the output optical power of the optical signal to the target value, and the first temperature compensation coefficient is obtained according to the current gain voltage and the reference gain voltage. The first temperature compensation coefficient is the ratio between the current gain voltage and the reference gain voltage.

[0079] The gain voltage output to the DSP chip 1200 is adjusted at a preset wavelength and a third temperature so that the output optical power of the optical fiber signal is adjusted to a target value, and a second temperature compensation coefficient is obtained according to the current gain voltage and a reference gain voltage, wherein the second temperature compensation coefficient is a ratio between the current gain voltage and the reference gain voltage.

[0080] The relationship between the temperature compensation coefficient and the temperature is fitted according to the first temperature compensation coefficient and the second temperature compensation coefficient, and a temperature compensation rule is generated. Exemplarily, the temperature compensation rule is a corresponding relationship table between each temperature and the temperature compensation coefficient.

[0081] The temperature compensation rule in the present application includes the temperature compensation coefficient corresponding to each temperature under the preset wavelength. The temperature compensation coefficient corresponding to each temperature can be queried through the temperature compensation rule.

[0082] In some embodiments of the present application, wavelength compensation and temperature compensation are performed on the output optical power of the optical signal according to the wavelength compensation rule and the temperature compensation rule, respectively, so as to obtain a gain voltage, and the gain voltage is the final gain voltage value input to the DSP chip 1200. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0083] Fig. 9 FIG. 1 is a schematic diagram of a process in which an MCU outputs a gain voltage to a DSP chip according to some embodiments of the present application. Fig. 9 As shown, in some embodiments, a first register and a second register are respectively stored in the MCU, the first register stores a wavelength compensation rule, and the second register stores a temperature compensation rule.

[0084] According to the wavelength compensation rule, the reference voltage corresponding to the current wavelength can be obtained, and according to the temperature compensation rule, the temperature compensation coefficient corresponding to the current temperature can be obtained, and then the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient. The gain voltage is the final gain voltage output to the DSP. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0085] Fig.10 The following is a flow chart of a method for adjusting the output optical power of an optical module according to some embodiments of the present application. Fig.10 As shown, in some embodiments, the method for adjusting the output optical power of an optical module includes:

[0086] S110: Obtain the current wavelength and current temperature;

[0087] S120: Obtaining a reference voltage corresponding to the current wavelength according to a wavelength compensation rule;

[0088] S130: Obtaining a temperature compensation coefficient corresponding to the current temperature according to a temperature compensation rule;

[0089] S140: Obtaining a gain voltage according to a reference voltage and a temperature compensation coefficient;

[0090] S150: Provide gain voltage to the DSP chip.

[0091] The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to a target value.

[0092] In the present application, in the above-mentioned embodiments, the reference voltage corresponding to the current wavelength is obtained according to the wavelength compensation rule, the temperature compensation coefficient corresponding to the current temperature is obtained according to the temperature compensation rule, and then the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to the target value. It is understandable that in some embodiments of the present application, the reference voltage corresponding to the current temperature can also be obtained according to the temperature compensation rule, the wavelength compensation coefficient corresponding to the current wavelength can be obtained according to the wavelength compensation rule, and the gain voltage can be obtained according to the reference voltage and the wavelength compensation coefficient. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0093] In some embodiments, a first register inside the MCU is used to store temperature compensation rules, and a second register inside the MCU is used to store wavelength compensation rules.

[0094] The temperature compensation rule includes: the correspondence between different temperatures and reference voltages at a preset wavelength. The reference voltage is the gain voltage output to the DSP chip 1200 corresponding to when the output optical power of the optical signal is adjusted to a target value at the preset wavelength.

[0095] The wavelength compensation rule includes: the correspondence between different wavelengths and wavelength compensation coefficients at a preset temperature. The wavelength compensation coefficient is the ratio between the gain voltage output to the DSP chip 1200 corresponding to when the output optical power of the optical signal at the current wavelength is adjusted to the target value at the preset temperature and the gain voltage corresponding to when the output optical power of the optical signal at the preset wavelength is adjusted to the target value. Exemplarily, the preset temperature can be room temperature, and the preset wavelength can be medium wavelength.

[0096] In some embodiments, the method for adjusting the output optical power of the optical module includes: obtaining the current wavelength and the current temperature; obtaining the reference voltage corresponding to the current temperature according to the temperature compensation rule; obtaining the wavelength compensation coefficient corresponding to the current wavelength according to the wavelength compensation rule; obtaining the gain voltage according to the reference voltage and the wavelength compensation coefficient. Exemplarily, the gain voltage can be obtained by multiplying the reference voltage by the wavelength compensation coefficient. The gain voltage is the gain voltage output to the DSP chip 1200 corresponding to the wavelength compensation and temperature compensation. The present application provides the gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0097] In the present application, in the above embodiment, the reference voltage corresponding to the current wavelength is obtained according to the wavelength compensation rule, the temperature compensation coefficient corresponding to the current temperature is obtained according to the temperature compensation rule, and then the gain voltage is obtained according to the reference voltage and the temperature compensation coefficient. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value. Alternatively, the reference voltage corresponding to the current temperature can be obtained according to the temperature compensation rule, the wavelength compensation coefficient corresponding to the current wavelength can be obtained according to the wavelength compensation rule, and the gain voltage can be obtained according to the reference voltage and the wavelength compensation coefficient. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value. It can be understood that the reference voltage can also be obtained according to the preset temperature and preset wavelength, the first compensation coefficient corresponding to the current temperature can be obtained according to the temperature compensation rule, the second compensation coefficient corresponding to the current wavelength can be obtained according to the wavelength compensation rule, and the gain voltage can be obtained according to the reference voltage, the first compensation coefficient, and the second compensation coefficient. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0098] The reference voltage is a gain voltage output to the DSP chip 1200 corresponding to when the output optical power of the optical signal is adjusted to a target value at a preset temperature and a preset wavelength. For example, the preset temperature may be room temperature, and the preset wavelength may be medium wavelength.

[0099] The temperature compensation rule includes: a first compensation coefficient corresponding to each temperature under a preset wavelength. Exemplarily, the first compensation coefficient refers to: a ratio between a gain voltage corresponding to when the output optical power of the optical signal is adjusted to a target value at the current temperature under a preset wavelength and a reference gain voltage. Exemplarily, the reference gain voltage is: a gain voltage corresponding to when the output optical power of the optical signal is adjusted to a target value under a preset temperature and a preset wavelength. Exemplarily, the preset temperature can be room temperature, and the preset wavelength can be medium wavelength.

[0100] The wavelength compensation rule includes: the correspondence between different wavelengths and the second compensation coefficient at a preset temperature. The second compensation coefficient is the ratio between the gain voltage corresponding to when the output optical power of the optical signal at the current wavelength is adjusted to the target value at the preset temperature and the gain voltage corresponding to when the output optical power of the optical signal at the preset wavelength is adjusted to the target value. Exemplarily, the preset temperature can be room temperature, and the preset wavelength can be medium wavelength.

[0101] In some embodiments, the method for adjusting the output optical power of the optical module includes: obtaining a reference voltage corresponding to a preset temperature and a preset wavelength; obtaining a first compensation coefficient corresponding to the current temperature according to a temperature compensation rule; obtaining a second compensation coefficient corresponding to the current wavelength according to a wavelength compensation rule; and obtaining a gain voltage according to the reference voltage, the first compensation coefficient, and the second compensation coefficient. Exemplarily, the gain voltage can be obtained by multiplying the reference voltage, the first compensation coefficient, and the second compensation coefficient. The gain voltage is the gain voltage output to the DSP chip 1200 corresponding to wavelength compensation and temperature compensation. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs a target modulation current, thereby adjusting the output optical power of the optical signal to the target value.

[0102] In the present application, by adjusting the gain voltage output to the DSP chip 1200, the modulation current output by the DSP chip 1200 is adjusted, so that the requirements for wavelength compensation and temperature compensation of the output optical power can be met.

[0103] In the present application, the purpose of adjusting the output optical power is achieved by adjusting the gain voltage output to the DSP chip, thereby adjusting the modulation current output by the DSP chip. At the same time, in order to compensate the output optical power for wavelength and temperature, the MCU stores wavelength compensation rules and temperature compensation rules respectively, and obtains the gain voltage according to the wavelength compensation rules and temperature compensation rules. The gain voltage is the gain voltage output to the DSP chip after wavelength compensation and temperature compensation, and the gain voltage is the final gain voltage value provided to the DSP chip. The present application provides a gain voltage to the DSP chip so that the DSP chip outputs the target modulation current, thereby adjusting the output optical power of the optical signal to the target value. The present application compensates for the optical power of wavelength and temperature at the same time, thereby reducing the influence of wavelength and temperature on the optical power, thereby maintaining the stability of the output optical power of the optical signal.

[0104] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed in the present application 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. An optical module, It is characterized in that include: Circuit boards; A tunable laser, electrically connected to the circuit board, for emitting light of different wavelengths; A DSP chip is electrically connected to the circuit board and is used to output a modulation current; A coherent optical modulator is electrically connected to the tunable laser and the DSP chip, respectively, and is used to receive a modulation current output by the DSP chip, and modulate the light emitted by the tunable laser according to the modulation current to generate an optical signal; An MCU is electrically connected to the DSP chip and is used to output different gain voltages to the DSP chip to adjust the modulation current output by the DSP chip, thereby adjusting the output optical power of the optical signal; the MCU is also used to change the refractive index of the interference arm in the coherent optical modulator by adjusting the bias current provided to the coherent optical modulator, thereby changing the phase difference between the two interference arms of the coherent optical modulator, thereby adjusting the working point of the coherent optical modulator; The MCU is configured to: obtain a reference voltage corresponding to the current wavelength according to a wavelength compensation rule, obtain a temperature compensation coefficient corresponding to the current temperature according to a temperature compensation rule, obtain a gain voltage according to the reference voltage and the temperature compensation coefficient, and then output the gain voltage to the DSP chip.

2. The optical module according to claim 1, It is characterized in that The MCUs respectively include: A first register is used to store the wavelength compensation rule, wherein the wavelength compensation rule includes: a correspondence between different wavelengths and the reference voltage at a preset temperature; the reference voltage represents a gain voltage corresponding to when the output optical power of the optical signal is adjusted to a target value at the preset temperature; The second register is used to store the temperature compensation rule, wherein the temperature compensation rule includes: the correspondence between different temperatures and the temperature compensation coefficient under the preset wavelength; the temperature compensation coefficient represents the ratio between the gain voltage corresponding to when the output optical power of the optical signal is adjusted to the target value at the current temperature under the preset wavelength and the reference gain voltage.

3. The optical module according to claim 2, It is characterized in that The MCU is configured as: Get the current wavelength and current temperature; Acquire a reference voltage corresponding to the current wavelength according to the wavelength compensation rule; Obtaining a temperature compensation coefficient corresponding to the current temperature according to the temperature compensation rule; A gain voltage is obtained according to the reference voltage and the temperature compensation coefficient, wherein the gain voltage is the product of the reference voltage and the temperature compensation coefficient.

4. The optical module according to claim 2, It is characterized in that The MCU is configured as: Adjusting the gain voltage output to the DSP chip at a preset temperature and a first wavelength so that the output optical power of the optical signal is adjusted to a target value, and recording the current gain voltage as an initial value of the gain voltage; Adjusting the gain voltage output to the DSP chip at a preset temperature and a second wavelength so that the output optical power of the optical signal is adjusted to a target value, and obtaining a first ratio, wherein the first ratio represents a ratio between a current gain voltage and an initial value of the gain voltage; Adjusting the gain voltage output to the DSP chip at a preset temperature and a third wavelength so that the output optical power of the optical signal is adjusted to a target value, and obtaining a second ratio, wherein the second ratio represents a ratio between a current gain voltage and an initial value of the gain voltage; The relationship between the reference voltage and the wavelength is fitted according to the first ratio and the second ratio, and the wavelength compensation rule is generated.

5. The optical module according to claim 2, It is characterized in that The reference gain voltage is a gain voltage corresponding to when the output optical power of the optical signal is adjusted to a target value at the preset temperature and the preset wavelength.

6. An optical module, It is characterized in that include: Circuit boards; A tunable laser, electrically connected to the circuit board, for emitting light of different wavelengths; A DSP chip is electrically connected to the circuit board and is used to output a modulation current; A coherent optical modulator is electrically connected to the tunable laser and the DSP chip, respectively, and is used to receive a modulation current output by the DSP chip, and modulate the light emitted by the tunable laser according to the modulation current to generate an optical signal; The MCU is electrically connected to the DSP chip and is used to output a gain voltage to the DSP chip to adjust the modulation current output by the DSP chip, thereby adjusting the output optical power of the optical signal; The MCU stores wavelength compensation rules and temperature compensation rules respectively; the MCU is configured as follows: Get the current wavelength and current temperature; Acquire a reference voltage corresponding to the current wavelength according to the wavelength compensation rule; Obtaining a temperature compensation coefficient corresponding to the current temperature according to the temperature compensation rule; A gain voltage is obtained according to the reference voltage and the temperature compensation coefficient, wherein the gain voltage is the final gain voltage output to the DSP chip, and the gain voltage is the product of the reference voltage and the temperature compensation coefficient, wherein the gain voltage represents the gain voltage output to the DSP chip after wavelength compensation and temperature compensation.

7. The optical module according to claim 6, It is characterized in that The MCU is configured as: Adjusting the gain voltage output to the DSP chip at a preset temperature and a first wavelength so that the output optical power of the optical signal is adjusted to a target value, and recording the current gain voltage as an initial value of the gain voltage; Adjusting the gain voltage output to the DSP chip at a preset temperature and a second wavelength so that the output optical power of the optical signal is adjusted to a target value, and obtaining a first ratio, where the first ratio is a ratio between a current gain voltage and an initial value of the gain voltage; Adjusting the gain voltage output to the DSP chip at a preset temperature and a third wavelength so that the output optical power of the optical signal is adjusted to a target value, and obtaining a second ratio, where the second ratio is a ratio between a current gain voltage and an initial value of the gain voltage; The relationship between the reference voltage and the wavelength is fitted according to the first ratio and the second ratio, and the wavelength compensation rule is generated.

8. The optical module according to claim 6, It is characterized in that The MCU is configured as: Adjusting the gain voltage output to the DSP chip at a preset wavelength and a first temperature so that the output optical power of the optical signal is adjusted to a target value, and recording the current gain voltage as a reference gain voltage; The gain voltage output to the DSP chip is adjusted at a preset wavelength and a second temperature so that the output optical power of the optical signal is adjusted to a target value, and a first temperature compensation coefficient is obtained according to the current gain voltage and the reference gain voltage, wherein the first temperature compensation coefficient is a ratio between the current gain voltage and the reference gain voltage; The gain voltage output to the DSP chip is adjusted at a preset wavelength and a third temperature so that the output optical power of the optical signal is adjusted to a target value, and a second temperature compensation coefficient is obtained according to the current gain voltage and the reference gain voltage, wherein the second temperature compensation coefficient is a ratio between the current gain voltage and the reference gain voltage; The relationship between the temperature compensation coefficient and temperature is fitted according to the first temperature compensation coefficient and the second temperature compensation coefficient, and the temperature compensation rule is generated.

9. An optical module, It is characterized in that include: Circuit boards; A tunable laser, electrically connected to the circuit board, for emitting light of different wavelengths; A DSP chip is electrically connected to the circuit board and is used to output a modulation current; A coherent optical modulator is electrically connected to the tunable laser and the DSP chip, respectively, and is used to receive a modulation current output by the DSP chip, and modulate the light emitted by the tunable laser according to the modulation current to generate an optical signal; An MCU is electrically connected to the DSP chip and is used to output different gain voltages to the DSP chip to adjust the modulation current output by the DSP chip, thereby adjusting the output optical power of the optical signal; the MCU is also used to change the refractive index of the interference arm in the coherent optical modulator by adjusting the bias current provided to the coherent optical modulator, thereby changing the phase difference between the two interference arms of the coherent optical modulator, thereby adjusting the working point of the coherent optical modulator; The MCU is configured to: obtain a reference voltage corresponding to the current temperature according to a temperature compensation rule, obtain a wavelength compensation coefficient corresponding to the current wavelength according to a wavelength compensation rule, obtain a gain voltage according to the reference voltage and the wavelength compensation coefficient, and then provide the gain voltage to the DSP chip.

10. The optical module according to claim 9, It is characterized in that The MCUs respectively include: A first register is used to store the temperature compensation rule, wherein the temperature compensation rule includes: a correspondence between different temperatures at a preset wavelength and the reference voltage; the reference voltage is a gain voltage corresponding to when the output optical power of the optical signal is adjusted to a target value at the preset wavelength; The second register is used to store the wavelength compensation rule, wherein the wavelength compensation rule includes: a correspondence between different wavelengths and wavelength compensation coefficients at a preset temperature; the wavelength compensation coefficient is a ratio between a gain voltage corresponding to when the output optical power of the optical signal at the current wavelength is adjusted to a target value at the preset temperature and a gain voltage corresponding to the preset wavelength.

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