CN114265213B - On-chip optical polarization control system based on digital-to-analog converter time division multiplexing - Google Patents
On-chip optical polarization control system based on digital-to-analog converter time division multiplexing Download PDFInfo
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Abstract
The invention discloses an on-chip light polarization control system based on digital-to-analog converter time division multiplexing, which belongs to the technical field of light polarization control, and realizes the polarization control of input light in any polarization state by modulating and controlling a plurality of phase shifters in an on-chip integrated optoelectronic device, wherein the on-chip integrated optoelectronic device comprises k phase shifters for compensating the phase and amplitude of two paths of output light with the same polarization; the method comprises the following steps: the digital-to-analog conversion module comprises an analog front-end module, a digital control module, a digital-to-analog conversion module, a demultiplexer, a time sequence control module and an output driving module; the time sequence control module provides time sequence control for the analog front end module, the digital control module, the digital-to-analog conversion module, the demultiplexer and the output driving module, so that one phase shifter in the on-chip integrated optoelectronic device is controlled in different time periods. The invention has the advantages of small volume, low power consumption, high integration level and the like, and adopts a phase shifter driving scheme of time division multiplexing to reduce the area and the power consumption of a control system.
Description
Technical Field
The invention belongs to the technical field of light polarization control, and particularly relates to an on-chip light polarization control system based on time division multiplexing of a digital-to-analog converter.
Background
Moore's law will move towards the end as semiconductor process nodes gradually approach physical size limits. Integrated photons have received extensive research and attention as a potential path of development in the aftermolarity era. For the current on-chip integrated optical device or system, due to the disturbance of environmental factors such as temperature, process deviation, and the limitation of its structure and architecture, it is often impossible to directly work at the optimal working point or achieve the complete function, so that it is usually necessary to add an additional adjustable unit such as a thermal regulator for adjustment and control. For example, for a silicon-based mach-zehnder modulator, a thermal modulator on a modulation arm needs to be adjusted so as to compensate process deviation and prevent the working state of the modulator from being influenced by disturbance of external environmental factors; for a silicon photon phased array, a phase difference between multiple paths of output light is usually adjusted by a heat adjuster so as to realize the deflection effect of a beam; for a polarization control system based on a silicon-based polarization rotating beam splitter, a thermal modulator is usually adopted to compensate amplitude and phase of a signal generated in a control process, so as to realize a complete polarization conversion function.
In the document Cao, r, et al (2019), "Multi-channel 28-GHz millimeter-wave signal generation on a silicon on photonic chip with automated polarization control," Journal of Semiconductors 40 (5): 052301, a polarization control method based on feedback control is disclosed, which converts input light of any polarization into two TE mode lights by using a polarization rotating beam splitter, and then compensates the two outputs in phase and amplitude by using a heat regulator and an MMI, and finally obtains two TE mode output lights with correlated output powers, wherein the sum of the output powers can be regarded as a fixed value under the condition that the input light power is not changed; therefore, one path of output is used as the total output of the system, the other path of output is used as a feedback signal and is output to the feedback circuit module, and the output light power of the feedback signal is adjusted by the heat adjuster to reach the minimum value, so that the total output light power of the system reaches the maximum value, and the purpose of controlling the polarization parameter is achieved.
In the documents Honggang Chen, bo Zhang, leilei Hu, yong Luo, yi Hu, xi Xiao, xuerui Liang, feng Li, and Linfei Gan, "Thermo-optical-based phase-shifter power two for silicon IQ optical modulator bias-control technology," Opt.Express 27,21546-21564 (2019), a method for IQ modulator bias control using a thermal modulator is disclosed, in which three thermal modulators are sequentially adjusted to stabilize the working states of the I-branch and the Q-branch and the relative phase shift between the two branches, so that the working states of the IQ modulator are not affected by external factors such as temperature, thereby achieving control of the parameter of the bias point.
In the above scheme, the single parameter integrated optical subsystem usually includes a plurality of thermal modulators for precise parameter control and stabilization, and therefore, a plurality of controllers are usually adopted to control the plurality of thermal modulators, which undoubtedly increases the area required by the control circuit, increases a large amount of extra power consumption, and is not beneficial to large-scale commercial application.
Disclosure of Invention
In view of the above defects or improvement requirements of the prior art, the present invention provides an on-chip optical polarization control system based on digital-to-analog converter time division multiplexing, which aims to integrate an optoelectronic device on one chip to perform polarization control on a plurality of phase shifters through closed-loop feedback, thereby solving the technical problems of large device volume and poor overall integration level in the existing polarization control system.
In order to achieve the above object, according to an aspect of the present invention, there is provided an on-chip optical polarization control system based on digital-to-analog converter time division multiplexing, the system performs modulation control on a plurality of phase shifters in an on-chip integrated optoelectronic device to perform polarization control on input light in any polarization state, the on-chip integrated optoelectronic device includes k phase shifters, and the k phase shifters are configured to compensate phase and amplitude of two paths of output light with the same polarization; the system comprises: the digital-to-analog conversion module comprises an analog front-end module, a digital control module, a digital-to-analog conversion module, a demultiplexer, a time sequence control module and an output driving module;
the on-chip integrated optoelectronic device also comprises a photodiode, wherein the photodiode is used for extracting output optical parameter information of the current on-chip integrated optoelectronic device so as to convert the output optical parameter information into an electric signal and output the electric signal to the analog front-end module;
the output end of the photodiode is connected to the input end of the analog front-end module, and the output end of the analog front-end module is connected to the input end of the digital control module; the output end of the digital control module is connected with the input end of the digital-to-analog conversion module; the output end of the digital-to-analog conversion module is connected with the input end of the demultiplexer; the output end of the demultiplexer is connected to the input end of the output driving module; the output end of the output driving module is connected to the input ends of the k phase shifters; the output end of the time sequence control module is respectively connected with the time sequence input ends of the analog front end module, the digital control module, the digital-to-analog conversion module, the demultiplexer and the output driving module;
the analog front-end module is used for amplifying and filtering the electric signal generated by the photodiode, extracting an input signal and converting the input signal into a digital signal; the digital control module is used for judging the current working state of the on-chip integrated optoelectronic device according to the digital signal and generating different output signals according to the working state of the on-chip integrated optoelectronic device and transmitting the output signals to the digital-to-analog conversion module; the digital-to-analog conversion module is used for receiving the output signal output by the digital control module, converting the output signal into an analog signal and transmitting the analog signal to the demultiplexer; the demultiplexer is used for selecting an output path at the current moment and outputting a signal to a specified output driving module to modulate a specified phase shifter; the time sequence control module is used for providing time sequence control for the analog front end module, the digital control module, the digital-to-analog conversion module, the demultiplexer and the output driving module so as to control one phase shifter in the on-chip integrated optoelectronic device in different time periods.
Preferably, the on-chip integrated optoelectronic device comprises a polarization beam splitter rotator, two phase shifters and two couplers; the two phase shifters are denoted as a first phase shifter and a second phase shifter, and the two couplers are denoted as a first coupler and a second coupler;
the first output end of the polarization beam splitting rotator is connected to the first input end of the first coupler, and the second output end of the polarization beam splitting rotator is connected to the input end of the first phase shifter; the output end of the first phase shifter is connected to the second input end of the first coupler; the first output end of the first coupler is connected with the first input end of the second coupler, and the second output end of the first coupler is connected with the input end of the second phase shifter; the output end of the second phase shifter is connected to the second input end of the second coupler; the first output end of the second coupler is used as an optical output end, and the second output end of the second coupler is connected to the photodiode.
Preferably, the analog front end module comprises a transimpedance amplifier, a sample-and-hold circuit and a comparator; the input end of the transimpedance amplifier is connected to the photodiode; a first output end of the transimpedance amplifier is connected to the sample hold circuit, and a second output end of the transimpedance amplifier is connected to a second input end of the comparator; the output end of the sampling hold circuit is connected to the first input end of the comparator; the output end of the comparator is connected with the digital control module;
the transimpedance amplifier is used for converting the electric signal generated by the photodiode into a voltage signal and respectively outputting the voltage signal to the sampling hold circuit and the comparator; the sampling hold circuit is used for keeping the input voltage signal unchanged; the comparator is used for comparing the voltage signal value of the last moment and the voltage signal value of the current moment, which are held by the sampling and holding circuit, so as to obtain the change trend of the current feedback signal, and transmitting the change trend to the digital control module.
Preferably, the analog front end module comprises a transimpedance amplifier, a filter and an analog-to-digital converter; the input end of the transimpedance amplifier is connected to the photodiode; the output end of the transimpedance amplifier is connected to the input end of the filter; the output end of the filter is connected with the input end of the analog-to-digital converter; the output end of the analog-to-digital converter is connected to the digital control module.
Preferably, the output driving module comprises two low dropout linear regulators; the output ends of the two low dropout linear regulators are respectively connected to the first phase shifter and the second phase shifter.
Preferably, the output driving module comprises a time division multiplexing low dropout linear regulator; the first output end of the time division multiplexing low dropout linear regulator is connected with the first phase shifter, and the second output end of the time division multiplexing low dropout linear regulator is connected with the second phase shifter.
Preferably, the output drive module comprises two power tube arrays; the output ends of the two power tube arrays are respectively connected to the first phase shifter and the second phase shifter.
Preferably, the phase shifter is a thermo-modulator based on thermo-optic effect.
Preferably, the phase shifter is a reverse-biased PN junction structure or a forward-biased PIN type structure based on a plasma dispersion effect.
Preferably, the polarization beam splitter rotator is a 2D grating coupler.
Generally speaking, compared with the prior art, the technical scheme of the invention can control the phase shifter in the on-chip integrated optoelectronic device by a time sequence multiplexing method, thereby effectively reducing the area and power consumption of the controller; the device has the advantages of small volume, low power consumption, high integration level and the like; meanwhile, the system can be used for providing accurate polarization control for the fields of optical communication, polarized light imaging, polarization coding in quantum communication and the like.
Drawings
FIG. 1 is a schematic diagram of a polarization control system according to an embodiment of the present invention;
FIG. 2 is a diagram of a thermostat phase shift adjustment sequence according to one embodiment of the invention;
FIG. 3 is a schematic diagram of an analog front end of an embodiment of the present invention;
FIG. 4 is a schematic diagram of the architecture of an analog front end of one embodiment of the present invention;
FIG. 5 is a schematic diagram of an output driver module according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an output driver module according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an output driver module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a polarization control system according to an embodiment of the present invention;
FIG. 9 is a diagram of the specific control logic of one embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same elements or structures, wherein: an arbitrary polarization state input 201; a polarization beam splitter rotator 202; a first phase shifter 203; a first coupler 204; a second phase shifter 205; a second coupler 206; a single polarization state output 207; a photodiode 208; an analog front end module 209; a digital control module 210; a digital-to-analog conversion module 211; a demultiplexer 212; an output driver module 213; a timing control module 214; a transimpedance amplifier 215; a sample-and-hold circuit 216; a comparator 217; a filter 218; an analog-to-digital converter 219; a low dropout linear regulator 220; a low dropout linear regulator 221; a time division multiplexing low dropout linear regulator 222; a power tube array 223; a power tube array 224.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 7, the present invention provides an on-chip optical polarization control system based on digital-to-analog converter time division multiplexing, which implements polarization control of input light in any polarization state by modulating and controlling a plurality of phase shifters in an on-chip integrated optoelectronic device, where the on-chip integrated optoelectronic device includes k phase shifters, and the k phase shifters are configured to compensate phases and amplitudes of two paths of output light with the same polarization; characterized in that the system comprises: an analog front end module 209, a digital control module 210, a digital-to-analog conversion module 211, a demultiplexer 212, a timing control module 214 and an output driving module 213;
the on-chip integrated optoelectronic device further includes a photodiode 208, where the photodiode 208 is configured to extract output optical parameter information of the current on-chip integrated optoelectronic device, so that the output optical parameter information is converted into an electrical signal and output the electrical signal to the analog front-end module 209;
the output end of the photodiode 208 is connected to the input end of the analog front end module 209, and the output end of the analog front end module 209 is connected to the input end of the digital control module 210; the output end of the digital control module 210 is connected to the input end of the digital-to-analog conversion module 211; the output end of the digital-to-analog conversion module 211 is connected to the input end of the demultiplexer 212; the output end of the demultiplexer 212 is connected to the input end of the output driving module 213; the output end of the output driving module 213 is connected to the input ends of the k phase shifters; the output end of the timing control module 214 is connected to the timing input ends of the analog front end module 209, the digital control module 210, the digital-to-analog conversion module 211, the demultiplexer 212 and the output driving module 213 respectively;
the analog front end module 209 is configured to amplify and filter the electrical signal generated by the photodiode 208, extract an input signal, and convert the input signal into a digital signal; the digital control module 210 is configured to determine a current working state of the on-chip integrated optoelectronic device according to the digital signal, and generate different output signals according to the working state of the on-chip integrated optoelectronic device, and transmit the different output signals to the digital-to-analog conversion module 211; the digital-to-analog conversion module 211 is configured to receive the output signal output by the digital control module 210, convert the output signal into an analog signal, and transmit the analog signal to the demultiplexer 212; the demultiplexer 212 is configured to select an output path at the current time, and output a signal to the designated output driving module 213 to modulate the designated phase shifter; the timing control module 214 is configured to provide timing control for the analog front end module 209, the digital control module 210, the digital-to-analog conversion module 211, the demultiplexer 212, and the output driving module 213, so that one phase shifter in the on-chip integrated optoelectronic device is controlled at different time periods.
Specifically, the on-chip integrated optoelectronic device includes a polarization beam splitter rotator 202, two phase shifters, and two couplers; two phase shifters are denoted as a first phase shifter 203 and a second phase shifter 205, and two couplers are denoted as a first coupler 204 and a second coupler 206;
a first output terminal of the polarization beam splitter rotator 202 is connected to a first input terminal of the first coupler 204, and a second output terminal thereof is connected to an input terminal of the first phase shifter 203; the output terminal of the first phase shifter 203 is connected to the second input terminal of the first coupler 204; a first output terminal of the first coupler 204 is connected to a first input terminal of the second coupler 206, and a second output terminal thereof is connected to an input terminal of the second phase shifter 205; the output of the second phase shifter 205 is connected to a second input of the second coupler 206; a first output terminal of the second coupler 206 serves as an optical output terminal, and a second output terminal thereof is connected to the photodiode 208.
Specifically, the analog front end module 209 includes a transimpedance amplifier 215, a sample-and-hold circuit 216, and a comparator 217; the input terminal of the transimpedance amplifier 215 is connected to the photodiode 208; a first output terminal of the transimpedance amplifier 215 is connected to the sample-and-hold circuit 216, and a second output terminal of the transimpedance amplifier 215 is connected to a second input terminal of the comparator 217; the output terminal of the sample-and-hold circuit 216 is connected to a first input terminal of the comparator 217; the output end of the comparator 217 is connected to the digital control module 210;
the transimpedance amplifier 215 is configured to convert the electrical signal of the photodiode 208 into a voltage signal, and output the voltage signal to the sample-and-hold circuit 216 and the comparator 217, respectively; the sample-and-hold circuit 216 is used for keeping the input voltage signal unchanged; the comparator 217 is configured to compare the voltage signal at the previous time held by the sample-and-hold circuit 216 with the voltage signal value at the current time, obtain a variation trend of the current feedback signal, and transmit the variation trend to the digital control module 210.
Specifically, the analog front end module 209 includes a transimpedance amplifier 215, a filter 218, and an analog-to-digital converter 219; the input terminal of the transimpedance amplifier 215 is connected to the photodiode 208; the output terminal of the transimpedance amplifier 215 is connected to the input terminal of the filter 218; the output of the filter 218 is connected to the input of the analog-to-digital converter 219; the output end of the analog-to-digital converter 219 is connected to the digital control module 210.
Specifically, the output driving module 213 includes two low dropout linear regulators 220 and 221; the output terminals of the two low dropout linear regulators 220 and 221 are connected to the first phase shifter 203 and the second phase shifter 205, respectively.
Specifically, the output driving module 213 includes a time division multiplexing low dropout linear regulator 222; the first output terminal of the time division multiplexing low dropout linear regulator 222 is connected to the first phase shifter 203, and the second output terminal thereof is connected to the second phase shifter 205.
Specifically, the output driving module 213 includes two power tube arrays 223 and 224; the output terminals of the two power tube arrays 223, 224 are connected to the first phase shifter 203 and the second phase shifter 205, respectively.
In particular, the phase shifter is a thermo-modulator based on thermo-optic effect.
Specifically, the phase shifter is a reverse-biased PN junction structure or a forward-biased PIN structure based on a plasma dispersion effect.
Specifically, the polarization beam splitter rotator 202 is a 2D grating coupler.
Further, the technical solution of the present invention will be further described with reference to the following specific examples. As shown in fig. 2 to 9, the present invention provides an on-chip optical polarization control system based on digital-to-analog converter time division multiplexing, which comprises two parts: an optical portion and an electrical portion. The optical part is an on-chip integrated optoelectronic device and comprises a polarization beam splitting rotator 202, a waveguide, a first phase shifter 203, a second phase shifter 205, a first coupler 204, a second coupler 206 and a photodiode 208, wherein the polarization beam splitting rotator 202 is used for converting input light 201 in any polarization state into two paths of output light with the same polarization, the first phase shifter 203 is used for compensating the phases of the two paths of output light with the same polarization, and the second phase shifter 205, the first coupler 204 and the second coupler 206 are used for combining the two paths of light to enable all the light to be output from one path of port, namely output 207 in a single-beam single polarization state; the photodiode 208 functions to convert the light from the second output terminal of the second coupler 206 into an electrical signal as a feedback signal and transmit the electrical signal to the electrical module.
To be further described, as shown in fig. 8, in an embodiment of the present invention, the electrical module is a feedback control circuit, wherein the analog front end module 209 is composed of a transimpedance amplifier 215, a sample-and-hold circuit 216, and a comparator 217, and the output driving module 213 is composed of two low dropout linear regulators 220, 221.
Specifically, the feedback control circuit includes an analog front end module 209, a digital control module 210, a digital-to-analog conversion module 211, a demultiplexer 212, an output driving module 213, and a timing control module 214. The analog front-end module 209 amplifies, filters and the like the current signal generated by the photodiode 208 to extract a more accurate input signal; the digital control module 210 performs judgment and logic processing according to the output of the analog front end module 209, and generates a corresponding digital output signal; the digital-to-analog conversion module 211 converts the digital output signal output by the digital control module 210 into an analog signal and transmits the analog signal to the demultiplexer 212; the demultiplexer 212 outputs signals to a specific part of the output driving module 213 under the control of a time sequence, so as to realize a time division multiplexing driving mode; the output driving module 213 drives the signal transmitted by the demultiplexer 212, so as to adjust the phase shift of the first phase shifter 203 and the second phase shifter 205; the timing control module 214 provides precise timing control for the analog front end module 209, the digital control module 210, the digital-to-analog conversion module 211, the demultiplexer 212, and the output driving module 213, so that the phase of a single phase shifter is adjusted at any time, thereby implementing a time division multiplexing driving mode.
To be further described, a specific control logic diagram of an embodiment of the present invention is shown in fig. 9, where the control logic is divided into two parts under the control of the time division multiplexing signal clk _ tdm: keeping the phase shift of the first phase shifter 203 constant, adjusting the phase shift of the second phase shifter 205 and keeping the phase shift of the second phase shifter 205 constant, adjusting the phase shift output of the first phase shifter 203. The two parts alternate under control of the clock clk _ tdm. For the control logic of a single phase shifter, the output variation trend at the current moment is determined by the output variation at the last moment and the input variation trend caused by the output variation:
when the output increases at the last moment, which causes the input to increase, the output decreases;
when the output increases at the last moment, which causes the input to decrease, the output increases;
when the output is reduced at the last moment, so that the input is increased, the output is increased;
when the input decreases at the last moment, resulting in a decrease in the input, the output decreases;
according to the above control logic, the feedback signal can be kept at a minimum value. The phase shifts generated by the first phase shifter 203 and the second phase shifter 205 are adjusted through feedback control, so that the feedback signal is kept at a minimum value, almost all optical power is output from a single port, and conversion of an arbitrary polarization state input 201 to a single polarization state output 207 is realized, namely, efficient polarization control is realized.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A light polarization control system on a chip based on time division multiplexing of a digital-to-analog converter is characterized in that the system realizes polarization control of input light in any polarization state by modulating and controlling a plurality of phase shifters in an integrated optoelectronic device on the chip, wherein the integrated optoelectronic device on the chip comprises k phase shifters, and the k phase shifters are used for compensating the phase and amplitude of two paths of output light with the same polarization; characterized in that the system comprises: the digital-to-analog conversion circuit comprises an analog front-end module, a digital control module, a digital-to-analog conversion module, a demultiplexer, a time sequence control module and an output driving module;
the on-chip integrated optoelectronic device also comprises a photodiode, wherein the photodiode is used for extracting output optical parameter information of the current on-chip integrated optoelectronic device so as to convert the output optical parameter information into an electric signal and output the electric signal to the analog front-end module;
the output end of the photodiode is connected to the input end of the analog front-end module, and the output end of the analog front-end module is connected to the input end of the digital control module; the output end of the digital control module is connected with the input end of the digital-to-analog conversion module; the output end of the digital-to-analog conversion module is connected with the input end of the demultiplexer; the output end of the demultiplexer is connected to the input end of the output driving module; the output end of the output driving module is connected to the input ends of the k phase shifters; the output end of the time sequence control module is respectively connected with the time sequence input ends of the analog front end module, the digital control module, the digital-to-analog conversion module, the demultiplexer and the output driving module;
the analog front-end module is used for amplifying and filtering the electric signal generated by the photodiode, extracting an input signal and converting the input signal into a digital signal; the digital control module is used for judging the current working state of the on-chip integrated optoelectronic device according to the digital signal and generating different output signals according to the working state of the on-chip integrated optoelectronic device and transmitting the output signals to the digital-to-analog conversion module; the digital-to-analog conversion module is used for receiving the output signal output by the digital control module, converting the output signal into an analog signal and transmitting the analog signal to the demultiplexer; the demultiplexer is used for selecting an output path at the current moment and outputting a signal to a specified output driving module to modulate a specified phase shifter; the time sequence control module is used for providing time sequence control for the analog front end module, the digital control module, the digital-to-analog conversion module, the demultiplexer and the output driving module so as to control one phase shifter in the on-chip integrated optoelectronic device in different time periods.
2. The system according to claim 1, wherein the on-chip integrated optoelectronic device comprises a polarization beam splitter rotator, two phase shifters and two couplers; the two phase shifters are denoted as a first phase shifter and a second phase shifter, and the two couplers are denoted as a first coupler and a second coupler;
the first output end of the polarization beam splitting rotator is connected to the first input end of the first coupler, and the second output end of the polarization beam splitting rotator is connected to the input end of the first phase shifter; the output end of the first phase shifter is connected to the second input end of the first coupler; the first output end of the first coupler is connected with the first input end of the second coupler, and the second output end of the first coupler is connected with the input end of the second phase shifter; the output end of the second phase shifter is connected to the second input end of the second coupler; the first output end of the second coupler is used as an optical output end, and the second output end of the second coupler is connected to the photodiode.
3. The system according to claim 2, wherein the analog front-end module comprises a transimpedance amplifier, a sample-and-hold circuit and a comparator; the input end of the transimpedance amplifier is connected to the photodiode; a first output end of the transimpedance amplifier is connected to the sample-and-hold circuit, and a second output end of the transimpedance amplifier is connected to a second input end of the comparator; the output end of the sampling and holding circuit is connected to the first input end of the comparator; the output end of the comparator is connected with the digital control module;
the transimpedance amplifier is used for converting the electric signal generated by the photodiode into a voltage signal and respectively outputting the voltage signal to the sampling hold circuit and the comparator; the sampling hold circuit is used for keeping the input voltage signal unchanged; the comparator is used for comparing the voltage signal value of the last moment and the voltage signal value of the current moment, which are held by the sampling and holding circuit, so as to obtain the change trend of the current feedback signal, and transmitting the change trend to the digital control module.
4. The system according to claim 2, wherein the analog front-end module comprises a transimpedance amplifier, a filter and an analog-to-digital converter; the input end of the transimpedance amplifier is connected to the photodiode; the output end of the trans-impedance amplifier is connected with the input end of the filter; the output end of the filter is connected with the input end of the analog-to-digital converter; the output end of the analog-to-digital converter is connected to the digital control module.
5. The system according to claim 3 or 4, wherein the output driving module comprises two LDO linear regulators; the output ends of the two low dropout linear regulators are respectively connected to the first phase shifter and the second phase shifter.
6. The system according to claim 3 or 4, wherein the output driving module comprises a time-division multiplexing low-dropout linear regulator; the first output end of the time division multiplexing low dropout linear regulator is connected with the first phase shifter, and the second output end of the time division multiplexing low dropout linear regulator is connected with the second phase shifter.
7. The system according to claim 3 or 4, wherein the output driving module comprises two power transistor arrays; the output ends of the two power tube arrays are respectively connected with the first phase shifter and the second phase shifter.
8. An on-chip optical polarization control system based on time division multiplexing of digital-to-analog converters according to any of claims 1 to 7, wherein the phase shifter is a thermo-optic effect based thermo-modulator.
9. The system according to any one of claims 1 to 7, wherein the phase shifter is an inverse-biased PN junction structure or a positive-biased PIN structure based on the plasma dispersion effect.
10. The system according to claim 2, wherein the polarization beam splitter rotator is a 2D grating coupler.
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