Photoelectric receiving system and method

Abstract

The invention discloses a photoelectric receiving system and method, and the system comprises a photodiode which is used for receiving an external optical signal and converting the external optical signal into an electric signal; the transimpedance amplifier is electrically connected with the photodiode and is used for converting the electric signal into a voltage signal and amplifying the voltage signal to obtain an amplified voltage signal; the coupler is connected with the output end of the trans-impedance amplifier and is used for filtering a direct-current component in the amplified voltage signal to obtain an alternating-current coupled voltage signal; the post-stage circuit is connected with the coupler and is used for performing digital signal conversion on the alternating current coupling voltage signal to obtain a target digital signal of the external optical signal; electric signals are converted into voltage signals through the trans-impedance amplifier and amplified, amplified voltage signals are obtained, current signals are converted into the voltage signals and amplified, and signal processing precision can be improved; the direct-current component in the amplified voltage signal is filtered through the coupler, and noise interference in the alternating-current component is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photoelectric sensing, in particular to a photoelectric receiving system and method. BACKGROUND

[0002] The existing high-precision photoelectric signal processing circuit often has to make a choice between the following aspects: coping with wide dynamic range light signals, suppressing complex environmental noise, maintaining high signal integrity, and realizing nanosecond-level high-speed signal edges. For example, a fixed gain design cannot simultaneously consider strong light and weak light scenarios; single-ended signals have weak anti-interference ability; there is a contradiction between noise filtering and signal speed; high-speed comparison is easily affected by signal quality problems.

[0003] Therefore, the prior art cannot guarantee the stability and precision of the output electrical signal in a scene with unstable light intensity, especially when strong and weak light alternates or transient light changes occur, which easily causes signal saturation or sensitivity to decrease. SUMMARY

[0004] The photoelectric receiving system and method provided by the embodiments of the present application aim to solve the problem that the prior art cannot guarantee the stability and precision of the output electrical signal in a scene with unstable light intensity.

[0005] To solve the above technical problems, the embodiments of the present application provide the following technical solutions: A photoelectric receiving system, comprising: a photodiode configured to accept an external light signal and convert the external light signal into an electrical signal; a transimpedance amplifier electrically connected to the photodiode, configured to convert the electrical signal into a voltage signal and amplify the voltage signal to obtain an amplified voltage signal; a coupler connected to an output end of the transimpedance amplifier, configured to filter out a direct current component in the amplified voltage signal to obtain an alternating current (AC) coupled voltage signal; a post-stage circuit connected to the coupler, configured to perform digital signal conversion on the AC coupled voltage signal to obtain a target digital signal of the external light signal.

[0006] Optionally, the transimpedance amplifier comprises a chip having multiple amplification factors, and the chip is configured to dynamically adjust the amplification factor of the transimpedance amplifier according to the strength of the external light signal.

[0007] Optionally, the post-stage circuit further comprises a differential amplifier connected to an output end of the coupler, configured to convert the AC coupled voltage signal into a differential signal. The post-stage circuit is further configured to perform digital signal conversion on the differential signal to obtain the target digital signal of the external light signal.

[0008] Optionally, the feedback resistor in the differential amplifier is a digital potentiometer, wherein the resistance of the digital potentiometer is dynamically adjusted according to the strength of the transimpedance amplifier output.

[0009] Optionally, the transimpedance amplifier comprises a gainable transimpedance amplifier connected with the coupler input end. The differential amplifier is further configured to adjust the differential operational amplifier gain output according to the output state of the variable gain transimpedance amplifier.

[0010] Optionally, the post-stage circuit further comprises a high-speed comparator connected with the output end of the differential amplifier, configured to perform digital logic conversion on the differential signal to obtain a digital level signal. The post-stage circuit is further configured to determine the target digital signal according to the digital level signal.

[0011] Optionally, the post-stage circuit further comprises a field programmable gate array connected with the output end of the high-speed comparator, configured to perform programmable logic processing on the digital level signal to obtain decoded data. The post-stage circuit is further configured to determine the decoded data as the target digital signal.

[0012] Optionally, the coupler comprises a coupling capacitor and a coupling transformer.

[0013] Optionally, the connection part between the photodiode and the transimpedance amplifier is shielded by an electromagnetic interference shield.

[0014] An optoelectronic receiving method, comprising: obtaining an external optical signal and converting the external optical signal into an electrical signal; converting the electrical signal into a voltage signal and amplifying the voltage signal to obtain an amplified voltage signal; filtering out a direct current component in the amplified voltage signal to obtain an alternating current coupled voltage signal; reprocessing the alternating current coupled voltage signal to obtain a target electrical signal.

[0015] In the embodiment of the present application, the external optical signal is converted into an electrical signal by a photodiode, and the electrical signal is converted into a voltage signal by a transimpedance amplifier and amplified to obtain an amplified voltage signal, realizing conversion of a current signal into a voltage signal and amplification processing, improving the signal-to-noise ratio of the signal and being conducive to improving the accuracy of signal processing; the direct current component in the amplified voltage signal is filtered out by a coupler to obtain an alternating current coupled voltage signal, reducing noise interference in the alternating current component; digital signal conversion is performed by a post-stage circuit to obtain a target digital signal of the external optical signal, greatly improving the stability and anti-interference ability of the output signal, and effectively avoiding signal distortion or saturation phenomenon in an alternating light and dark environment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the photoelectric receiving system provided by the present invention; Figure 2 This is a circuit block diagram of an embodiment of the photoelectric receiving system provided by the present invention; Figure 3 This is a schematic flowchart of an embodiment of the photoelectric receiving method provided by the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the following description, specific embodiments of the invention will be illustrated with reference to steps and symbols performed by one or more computers, unless otherwise stated. Therefore, these steps and operations will be referred to several times as being performed by a computer, and computer execution as referred to herein includes operations by a computer processing unit representing electronic signals of data in a structured format. This operation transforms the data or maintains it at a location in the computer's memory system, which can be reconfigured or otherwise alter the operation of the computer in a manner well known to those skilled in the art. The data structure maintained by the data is the physical location of the memory, which has specific characteristics defined by the data format. However, the principles of the invention described above are not intended to be limiting, and those skilled in the art will understand that many of the steps and operations described below can also be implemented in hardware.

[0020] The terms "module" or "unit" as used herein can be considered as software objects executing on the computing system. The different components, modules, engines, and services described herein can be considered as implementation objects on the computing system. The apparatus and methods described herein are preferably implemented in software, but can also be implemented in hardware, both of which are within the scope of this invention.

[0021] Embodiments of the present application provide an optoelectronic receiving system and method.

[0022] Please refer to Figure 1 , Figure 1 An embodiment of the optoelectronic receiving system provided by the embodiments of the present application is shown in the structural schematic diagram. The optoelectronic receiving system 100 comprises: A photodiode 101 is configured to receive an external optical signal and convert the external optical signal into an electrical signal; A transimpedance amplifier 102 is electrically connected to the photodiode 101 and configured to convert the electrical signal into a voltage signal and amplify the voltage signal to obtain an amplified voltage signal; A coupler 103 is connected to the output end of the transimpedance amplifier 102 and configured to filter out the direct current component in the amplified voltage signal to obtain an alternating current (AC) coupled voltage signal; A post-stage circuit 104 is connected to the coupler 103 and configured to perform digital signal conversion on the AC coupled voltage signal to obtain a target digital signal of the external optical signal.

[0023] It should be noted that the photodiode 101 is a device that converts an optical signal into an electrical current signal based on the photoelectric effect. Generally, the photodiode 101 senses a small light intensity, and thus outputs a weak electrical current signal.

[0024] The external optical signal specifically refers to incident light that needs to be optoelectronically converted, which can include visible light, infrared light, or ultraviolet light, and can also be a specific waveband pulsed light signal or a continuous light signal, or a specific device such as an optical carrier signal in a fiber-optic communication system, a return signal in a laser radar, etc., which is not limited herein.

[0025] The transimpedance amplifier 102 (TIA) is also known as a mutual impedance amplifier, which is a key electronic circuit that converts an input current signal into an output voltage signal. The core function of the transimpedance amplifier 102 is to realize linear conversion from current to voltage. By converting the current signal output by the photodiode 101 into a voltage signal and amplifying it, the amplitude of the signal can be effectively improved, which is convenient for subsequent circuit processing.

[0026] The coupler 103 is a device that filters out the direct current component in the amplified voltage signal to obtain an AC coupled voltage signal. The AC coupled voltage signal only retains the changing optical signal component, which is conducive to eliminating the interference caused by static bias, thereby improving the detection sensitivity of the system to weak optical signals.

[0027] The post-stage circuit 104 is a circuit that obtains a target digital signal of the external optical signal by performing digital signal conversion on the AC coupled voltage signal.

[0028] In the embodiment of the present application, the external light signal is converted into an electric signal by the photodiode 101, and then the electric signal is converted into a voltage signal and amplified by the transimpedance amplifier 102 to obtain an amplified voltage signal, realizing the conversion of the current signal into the voltage signal and the amplification processing, improving the signal-to-noise ratio of the signal, and being beneficial to improve the precision of the signal processing; the direct current component in the amplified voltage signal is filtered out by the coupler 103 to obtain an alternating current coupled voltage signal, reducing the noise interference in the alternating current component; the digital signal conversion is performed by the post-stage circuit 104 to obtain the target digital signal of the external light signal, greatly improving the stability and anti-interference ability of the output signal, and effectively avoiding the signal distortion or saturation phenomenon in the alternating environment of strong light and weak light.

[0029] In a specific embodiment, the bandwidth capability and detection capability of the photodiode 101 can also be enhanced by adding a reverse bias to the photodiode 101.

[0030] In a specific embodiment, the transimpedance amplifier 102 includes a chip with multiple amplification multiples, and the chip is used to dynamically adjust the amplification multiple of the transimpedance amplifier 102 according to the strength of the external light signal.

[0031] Specifically, the transimpedance amplifier 102 selects a chip with low noise, high gain, low group delay and fast overload recovery characteristics, and such a chip is ideally suitable for laser ranging applications. Preferably, the chip has two amplification multiples of 150 and 750, and the input reference noise density is only 1.1 pA / √Hz. Therefore, when the light signal is too weak, the amplification multiple is increased, or directly switched to a higher gear with a higher amplification multiple, to enhance the signal detection capability of the transimpedance amplifier 102.

[0032] In the embodiment, the amplification multiple of the transimpedance amplifier 102 is dynamically adjusted by the chip according to the strength of the external light signal, so that the transimpedance amplifier 102 can adapt to light signals of different intensities and avoid output saturation distortion when the light signal is too strong. At the same time, the low noise and high gain characteristics of the transimpedance amplifier 102 improve the weak signal detection capability and signal-to-noise ratio, and the amplification multiple can be increased when the light signal is too weak to enhance the signal detection capability, thereby improving the dynamic range and signal processing performance of the photoelectric receiving system 100.

[0033] In a specific embodiment, the coupler 103 includes a coupling capacitor and a coupling transformer.

[0034] In a specific embodiment, the post-stage circuit 104 further includes a differential amplifier connected to the output end of the coupler 103, and used to convert the alternating current coupled voltage signal into a differential signal. The post-stage circuit 104 is further used to perform digital signal conversion on the differential signal to obtain the target digital signal of the external light signal.

[0035] It should be noted that the differential amplifier is an electronic amplifier, the input is a differential signal, and the output is the amplified signal of the difference between the two input signals. In the embodiment, the signal anti-interference ability can be improved by converting the alternating coupling voltage signal into a differential signal. The differential signal has strong suppression ability to common mode noise during transmission, and can effectively eliminate the influence of power supply fluctuation, temperature drift and electromagnetic interference.

[0036] Further, the feedback resistor in the differential amplifier is a digital potentiometer, wherein the resistance value of the digital potentiometer is dynamically adjusted according to the strength of the transimpedance amplifier output.

[0037] Specifically, the differential amplifier uses an adjustable resistor as a feedback resistor to adapt to different light intensities. In actual application scenarios, if the light signal intensity in the actual application is basically stable, then the digital sliding rheostat is used for fine adjustment of each circuit board. If the light intensity signal changes, the digital potentiometer is used to dynamically amplify the signal to the appropriate interval, so as to ensure that the output signal is always within the linear input range of the subsequent circuit 104.

[0038] Further, the transimpedance amplifier 102 includes a gainable transimpedance amplifier connected to the input end of the coupler 103. The differential amplifier is also used to adjust the differential op-amp gain of the output according to the output state of the variable gain transimpedance amplifier.

[0039] It should be noted that the gainable transimpedance amplifier is a special type of transimpedance amplifier 102, whose transimpedance gain (i.e. the ratio of output voltage to input current) can be externally controlled or programmed. By making its gain variable, it can cope with complex and wide dynamic range real-world signals, and is a key component in modern precision measurement systems.

[0040] The gain state refers to the specific gain value set by the gainable transimpedance amplifier at a certain time, which accurately describes the working mode of the gainable amplifier at the current time (what is the specific gain). By dynamically switching between different "gain states", the system can cope with a wide range of input signal strengths, thereby significantly expanding its dynamic range.

[0041] The differential op-amp gain refers to the ratio between the output voltage of the gainable transimpedance amplifier and the difference between the voltages of the two input ports, which is used to measure how many times the difference between the two input signals is amplified by the gainable transimpedance amplifier.

[0042] For weak light scenarios, after the transimpedance amplifier 102 outputs at high gain, the digital potentiometer increases the feedback resistance to increase the differential op-amp gain and further amplify the signal to the target amplitude. For strong light scenarios, after the transimpedance amplifier 102 outputs at low gain, the digital potentiometer reduces the feedback resistance to reduce the differential op-amp gain and avoid excessive signal amplitude.

[0043] Through the combination of the "coarse adjustment" of the transimpedance amplifier 102 and the "fine adjustment" of the differential operational amplifier digital potentiometer, the full dynamic range coverage of different light intensity signals is realized, and the consistency of the final output signal amplitude is ensured.

[0044] In the embodiment, the transimpedance gain is adjusted by the gainable transimpedance amplifier to adapt to different input light signal intensities, and the gain of the differential amplifier is adjusted according to the output state of the gainable transimpedance amplifier, realizing the linkage of the gains of the two, thereby keeping the total gain of the photoelectric receiving system 100 stable, optimizing the signal-to-noise ratio, expanding the dynamic range, and improving the adaptability to different intensity light signals.

[0045] Further, the post-circuit 104 further includes a high-speed comparator connected with the output end of the differential amplifier, for performing digital logic conversion on the differential signal to obtain a digital level signal. The post-circuit 104 is further configured to determine a target digital signal according to the digital level signal.

[0046] It should be noted that the high-speed comparator is an integrated circuit for quickly judging the relative size of two input voltages, which outputs a digital level (high or low) representing the comparison result by comparing the voltages of the same phase input end (V+) and the opposite phase input end (V-), and the decision speed is extremely fast.

[0047] Specifically, the high-speed comparator is selected from a high-speed type, the typical overdrive dispersion of the chip used is only 25 ps, and the rise time is only 165 ps, and a high-speed comparator chip with output LVDS (Low-Voltage Differential Signaling) is selected. Different high-speed comparison chips can be selected for different processing methods, but the overdrive dispersion and rise time parameters need to be paid attention to.

[0048] It should be noted that the present application is not limited to converting the optical signal into a digital signal of 0 or 1 through the comparator, and the comparator in the design is mainly used for phase detection, so only the frequency and phase change of the optical signal are concerned, and in some special occasions, different uses need to be inserted, and the ADC sampling or the method of directly using the analog signal can be used.

[0049] In the embodiment, the high-speed comparator is used to perform digital logic conversion on the differential signal output by the differential amplifier to obtain a digital level signal, and the post-circuit 104 is used to determine a target digital signal according to the digital level signal, realizing high-speed and accurate digital conversion of the photoelectric receiving signal from the differential analog signal to the target digital signal, and improving the digital processing capability and response speed to high-speed signals of the photoelectric receiving system 100.

[0050] Further, the post-stage circuit 104 further comprises a field programmable gate array connected with the output end of the high-speed comparator, for programmable logic processing of the digital level signal to obtain decoded data. The post-stage circuit 104 is further configured to determine the decoded data as the target digital signal.

[0051] It should be noted that the field programmable gate array (FPGA) is a programmable logic device with high flexibility, which can realize user-defined digital logic functions at the hardware level. By configuring the internal logic units and interconnection resources, the FPGA can perform real-time encoding, decoding, timing correction and protocol matching on the digital level signal output by the high-speed comparator, so as to extract the decoded data conforming to the communication protocol.

[0052] In the embodiment, the digital level signal output by the high-speed comparator is processed by programmable logic to obtain decoded data, and the decoded data is determined as the target digital signal, thereby realizing flexible decoding and real-time processing of the high-speed photoelectric signal, fully utilizing the advantages of FPGA in timing control and parallel operation, and improving the overall response speed and reliability of the system.

[0053] In a specific embodiment, the connection part between the photodiode 101 and the transimpedance amplifier 102 is shielded by an electromagnetic interference shield.

[0054] Specifically, in the process of processing weak optical signals, the optical signal needs to be protected before amplification, such as: the photodiode 101 to the transimpedance amplifier 102 circuit board needs to be wrapped throughout the ground to avoid interference on the circuit board from entering the core link, and a shield can be added on the photodiode 101 to the transimpedance amplifier 102 circuit board to avoid electromagnetic interference from the air into the core link.

[0055] Further, the weak optical signal output by the laser interferometer is easily affected by noise, that is, the input optical signal is easily disturbed, which affects the overall performance of the system, so an optical-electric converter with a larger signal-to-noise ratio needs to be selected to obtain the optical signal.

[0056] At the same time, temperature changes may also directly affect the output of the measurement result, therefore, the optical-electric converter itself should have good temperature stability, and a refrigeration module can be arranged in the optical-electric converter for temperature control, which is not limited here.

[0057] In the embodiment, the electromagnetic interference shield can effectively prevent electromagnetic interference in the air from entering the circuit between the photodiode 101 and the transimpedance amplifier 102, protect the weak optical signal from being disturbed before amplification, and ensure the signal quality.

[0058] Further, in order to comprehensively describe the structure of the photoelectric receiving system, please refer to Figure 2 , Figure 2 The circuit block diagram of an embodiment of the photoelectric receiving system provided by the embodiment of the present application, wherein the APD is an avalanche photodiode 101, which converts the received optical signal into a weak current signal and outputs to a transimpedance amplifier 102; the VPD is a reverse bias voltage of the APD, which is usually a high voltage, used to improve the photoelectric conversion sensitivity; the LVDS (low voltage differential signal) is a high-speed, low-power digital signal transmission standard, which can reduce electromagnetic interference at high speed through differential signal transmission, and is commonly used in high-speed interfaces of digital chips such as FPGA.

[0059] Specifically, the high-sensitivity photodiode 101 is directly fixed to the end of the optical fiber, which maximizes the transmission path of the optical signal in the air, effectively avoids the interference of ambient light, and ensures accurate sampling of weak optical signals; the cascade amplification structure of the transimpedance amplifier 102 and the differential operational amplifier, combined with the dynamic adjustment of the amplification factor by the digital potentiometer, can stably amplify different light intensity signals to similar amplitudes, and the extremely low typical overdrive dispersion and ultra-short rise time characteristics of the high-speed comparator 142 can ensure high-precision processing of the number and phase of pulses from signal acquisition to level conversion, significantly improving the accuracy of subsequent FPGA signal processing.

[0060] The adjustable resistor design of the adjustable gain transimpedance amplifier 102 and the differential amplifier feedback loop allows the circuit to flexibly adjust the signal amplification factor according to the dynamic changes of the light intensity in the actual application scenario, ensuring the consistency of the output signal amplitude under different light intensities, avoiding phase judgment errors caused by amplitude differences, and significantly improving the applicability of the circuit in multiple scenarios such as laser ranging and high-speed optical communication.

[0061] The amplification and isolation of the differential operational amplifier, combined with the common-mode noise suppression characteristics of the differential RC filter circuit, effectively maintain the phase consistency during signal transmission; the ultra-short rise time and low overdrive dispersion of the high-speed comparator 142 ensure that the phase jitter during high-frequency signal zero-crossing comparison is strictly controlled, and the phase information of the original optical signal is maximized during the conversion from analog signal to digital signal, providing bottom-level hardware support for high-precision phase measurement and pulse counting.

[0062] In the signal link between the transimpedance amplifier 102 and the differential operational amplifier in the rear stage, the direct-current isolation capacitor design adopted in the application has double technical advantages: by connecting the direct-current isolation capacitor in series at the output end of the transimpedance amplifier 102, the frequency selection characteristic of the capacitor that "isolates direct current and passes alternating current" is utilized, on the one hand, the direct-current bias generated by the front-stage circuit can be effectively isolated, the common-mode level of the input end of the differential operational amplifier in the rear stage is ensured to dynamically match the output of the front stage, and the problem of amplification saturation caused by direct-current drift is avoided; on the other hand, the capacitor and the input impedance in the rear stage naturally form an RC high-pass filter network, low-frequency noise is inhibited, and the preliminary filtering of the signal link is completed without introducing additional active devices, thereby providing a pure alternating current coupled signal input for precise secondary amplification processing.

[0063] It should be noted that the application filters differentially by RC, and in other embodiments, for a higher precision scenario, an active filter can also be used to filter the signal, which is not limited herein.

[0064] In the embodiment, the avalanche photodiode 101 (APD, Avalanche Photodiode) receives an optical signal and converts it into a current signal, which is powered by a "+VPD (reverse bias voltage of APD)" power supply; the current signal output by the APD is converted into a voltage signal by the transimpedance amplifier 102; then, the voltage signal is coupled to the differential amplifier 141 through a capacitor, differential amplification is performed to suppress common-mode noise; the amplified analog signal is input into the high-speed comparator 142, which converts it into a digital signal in the LVDS (Low Voltage Differential Signal) format; finally, the LVDS digital signal is transmitted to the FPGA (Field Programmable Gate Array 143) for subsequent digital logic processing. The overall link realizes a complete signal chain of optical signal→current→voltage→differential amplification→digital conversion→FPGA processing, fully utilizes the synergistic advantages of the high sensitivity of the APD and the programmable logic of the FPGA, and realizes efficient conversion from weak optical signals to digital decoding.

[0065] It should be noted that in a specific embodiment, the differential amplifier, the high-speed comparator and the field programmable gate array can be combined as needed, which is not limited herein.

[0066] The application further provides an optoelectronic receiving method, please refer to Figure 3 , Figure 3 The flowchart of an embodiment of the optoelectronic receiving method provided by the application includes: S301: obtaining an external optical signal and converting the external optical signal into an electrical signal; S302: converting the electrical signal into a voltage signal and amplifying the voltage signal to obtain an amplified voltage signal; S303: filtering out the direct-current component in the amplified voltage signal to obtain an alternating current coupled voltage signal; S304: reprocessing the AC coupling voltage signal to obtain a target electric signal.

[0067] In this embodiment, the strength of the electric signal is improved through voltage conversion and amplification, and the anti-noise capability is enhanced; the direct current component in the amplified voltage signal is filtered out, and the useful AC signal is retained, so that the signal purity is improved; the signal characteristics are optimized through reprocessing, so that the application requirements of subsequent demodulation, data processing and the like are met, and the effective conversion and reception of the optical signal to the electric signal are realized.

[0068] The above describes in detail the photoelectric receiving method provided by the embodiment of the present application, and the principle and implementation manner of the present application are described by applying specific examples; the above embodiment is only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, the specific implementation manner and application range will be changed according to the idea of the present application; in conclusion, the content of the specification should not be understood as the limitation of the present application.

Claims

1. An optoelectronic receiving system, characterized by The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method.

2. The optoelectronic receiving system of claim 1, wherein, The application relates to a signal conversion device and a signal conversion method.

3. The optoelectronic receiving system of claim 1, wherein, The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method.

4. The optoelectronic receiving system of claim 3, wherein, The application relates to a signal conversion device and a signal conversion method.

5. The optoelectronic receiving system of claim 3, wherein, The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method.

6. The optoelectronic receiving system of claim 3, wherein, The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method.

7. The optoelectronic receiving system of claim 6, wherein, The application relates to a signal conversion device and a signal conversion method. The application relates to a signal conversion device and a signal conversion method.

8. The photovoltaic receiving system of claim 1, wherein, The application relates to a signal conversion device and a signal conversion method.

9. The photovoltaic receiving system of claim 1, wherein, The application relates to a signal conversion device and a signal conversion method.

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