An optical signal receiving system and an optical module

Abstract

The application provides an optical signal receiving system and an optical module. The optical signal receiving system comprises a first receiving module, a second receiving module and a logic module connected with the first receiving module and the second receiving module respectively. The first receiving module detects the optical signal in cooperation with a preset threshold and outputs a first comparison result, and the second receiving module detects the optical signal in a demodulation mode and outputs a second comparison result. In the optical signal receiving system, the first receiving module and the second receiving module receive the optical signal of the same light source, so that the detection of the optical signal can be realized on the basis of ensuring the consistency of the received light source, the detection error caused by the different sources of the optical signal can be avoided, and the optical signal receiving system has good detection effect. Meanwhile, the optical signal receiving system switches between the receiving modules and outputs different comparison results in cooperation with the logic module, so that the application flexibility of the optical signal receiving system is improved.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, specifically to an optical signal receiving system and an optical module. Background Technology

[0002] As a core carrier of modern information transmission, optical fiber communication technology, relying on its high bandwidth, low loss, and resistance to electromagnetic interference, has become the infrastructure supporting emerging fields such as mobile internet, the Internet of Things, and cloud computing. With the deepening deployment of 5G networks and the arrival of the era of the Internet of Everything, global data traffic is growing exponentially, placing almost stringent demands on the transmission rate, stability, and coverage distance of optical fiber communication systems. However, limited by physical laws and material properties, the performance improvement of optical fiber communication systems is gradually approaching theoretical limits. Especially in complex dynamic environments, the problem of optical signal attenuation in optical signal transmission is becoming increasingly prominent, becoming a core bottleneck restricting high-reliability communication.

[0003] The direct consequences of optical signal attenuation include communication link interruption, a surge in bit error rate, and decreased system reliability. Current methods for detecting optical signal attenuation in fiber optic communication mostly employ fixed-threshold optical power detection, triggering alarms only when the signal strength falls below a preset threshold. This approach suffers from limitations in detection results and a narrow range of application scenarios. Summary of the Invention

[0004] This application provides an optical signal receiving system and an optical module that can simultaneously adapt to different detection scenarios of optical signal transmission intensity, and can work with a logic module to output comparison results corresponding to different detection scenarios and different detection requirements, thus having good application scenario adaptability, flexibility and detection reliability.

[0005] This application provides an optical signal receiving system, which includes a first receiving module, a second receiving module, and logic modules connected to the first and second receiving modules respectively. The first and second receiving modules are configured to receive optical signals from the same light source. The first receiving module includes a photoelectric conversion unit and a comparator connected to each other. The photoelectric conversion unit receives the optical signal and converts it into a first voltage signal. The comparator receives the first voltage signal and compares its voltage value with a preset threshold to output a first comparison result. The preset threshold is a voltage threshold corresponding to an optical power threshold. The second receiving module includes an optical receiver and a first signal processing unit connected to each other. The optical receiver receives the optical signal and converts it into a second voltage signal. The first signal processing unit demodulates the second voltage signal and outputs a second comparison result based on the demodulated signal. The logic module receives the first comparison result and the second comparison result and outputs the first comparison result and / or the second comparison result.

[0006] In one embodiment of this application, the first receiving module further includes a second signal processing unit connected to a comparator, used to receive a first digital signal and convert the first digital signal into a third voltage signal for transmission to the comparator; wherein the first digital signal carries information representing a preset threshold, and the voltage value of the third voltage signal is equal to the preset threshold.

[0007] In one embodiment of this application, the photoelectric conversion unit includes:

[0008] A photodetector is used to receive optical signals and convert them into electrical signals.

[0009] A logarithmic amplifier is used to amplify the current signal converted by the photodetector.

[0010] A transimpedance amplifier is used to convert the current signal output by a logarithmic amplifier into a first voltage signal and output it to a comparator.

[0011] In one embodiment of this application, the optical signal receiving system further includes a control module, which is connected to a first signal processing unit, a second signal processing unit, and a logic module. The control module is used to determine an optical power threshold based on a loss threshold input by the user, a temperature compensation value of the photodetector, a frequency compensation value of the photodetector, and a dark current compensation value of the photodetector, and to determine a first digital signal based on the optical power threshold, and to transmit the first digital signal to the second signal processing unit.

[0012] In one embodiment of this application, the first signal processing unit includes:

[0013] An analog-to-digital converter is used to receive a second voltage signal and convert the second voltage signal into a second digital signal;

[0014] A digital signal processor is used to receive a second digital signal and demodulate the second digital signal to obtain a demodulated signal.

[0015] In one embodiment of this application, the first signal processing unit is further configured to output a third comparison result when the signal transmission rate of the second digital signal is different from the operating rate of the digital signal processor;

[0016] Alternatively, the first signal processing unit is also configured to output a third comparison result in the absence of a second digital signal;

[0017] Alternatively, the first signal processing unit may also output a third comparison result if the signal strength of the second digital signal is not within a preset signal strength range.

[0018] In one embodiment of this application, the control module is configured to receive a first switching instruction input by the user and, in response to the first switching instruction, switch the logic module to optical signal mode, and the logic module outputs a first comparison result in optical signal mode;

[0019] The control module is used to receive a second switching command input by the user and, in response to the second switching command, switch the logic module to electrical signal mode. The logic module outputs a second comparison result in electrical signal mode.

[0020] The control module is used to receive a third switching command input by the user and, in response to the third switching command, switch the logic module to photoelectric signal mode. In photoelectric signal mode, the logic module outputs a first comparison result and / or a second comparison result.

[0021] In one embodiment of this application, the first comparison result is a high-level signal or a low-level signal, and the second comparison result is a high-level signal or a low-level signal;

[0022] When the logic module is in photoelectric signal mode, the logic module is used to receive and detect the first comparison result and the second comparison result. If the first comparison result and / or the second comparison result are high-level signals, the logic module outputs a high-level signal.

[0023] In one embodiment of this application, when the logic module is in photoelectric signal mode, the logic module is further configured to output a low-level signal when both the first comparison result and the second comparison result are low-level signals.

[0024] This application also provides an optical module, which includes an optical transmitter and an optical receiver. The optical receiver module includes the optical signal receiving system as described in any of the above embodiments.

[0025] This application achieves optical LOS (Loss of Signal) detection and electrical LOS detection through the coordinated operation of the first and second receiving modules, thereby improving the reliability and accuracy of optical signal reception. Specifically, this optical signal receiving system has the following beneficial effects:

[0026] First, the first receiving module employs a combination of a photoelectric conversion unit and a comparator. It converts the received optical signal into a first voltage signal and compares this signal with a voltage threshold corresponding to the optical power threshold, thereby achieving optical LOS detection. This detection method can quickly respond to significant attenuation or interruption of the optical signal, improving the system's ability to detect signal loss.

[0027] Secondly, the second receiving module demodulates the optical signal through a combination of an optical receiver and the first signal processing unit, and performs electrical LOS detection based on the characteristics of the demodulated signal. Compared with simple optical power detection, electrical LOS detection can comprehensively consider the integrity of the modulated optical signal, thereby reducing misjudgments caused by optical power fluctuations or transient interference, and improving the system's anti-interference capability.

[0028] Third, since the optical signal receiving system of this application can simultaneously realize optical LOS detection and electrical LOS detection, compared with the traditional optical signal receiving system that only relies on the optical power threshold for optical LOS detection, it realizes further judgment based on the signal demodulation results, thereby making up for the shortcomings of optical LOS detection and improving the signal detection accuracy and reliability of the overall system.

[0029] In addition, the logic module receives the first comparison result and the second comparison result, and outputs the corresponding result as needed. This design allows the system to flexibly adapt to different application scenarios. For example, when optical LOS detection alone is sufficient to meet the requirements, the first comparison result can be selected to be output; while in applications requiring higher detection accuracy, the electrical LOS detection result can be combined to improve the system's detection accuracy.

[0030] In summary, the optical signal receiving system of this application improves the reliability, anti-interference capability, and detection accuracy of the optical signal receiving system by combining optical LOS detection and electrical LOS detection. At the same time, the introduction of logic modules enhances the flexibility of the system, making it applicable to various optical communication application scenarios, thereby improving the overall system performance.

[0031] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0034] Figure 1 A first architecture diagram of an optical signal receiving system provided for an exemplary embodiment of this disclosure;

[0035] Figure 2 A second architecture diagram of an optical signal receiving system provided as an exemplary embodiment of this disclosure;

[0036] Figure 3 A schematic diagram of a third architecture of an optical signal receiving system provided for an exemplary embodiment of this disclosure.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1- Optical signal receiving system;

[0039] 10-First receiving module, 11-Photoelectric conversion unit, 111-Photodetector, 112-Logarithmic amplifier, 113-Transimpedance amplifier, 12-Comparator, 13-Second signal processing unit, 131-Digital-to-analog converter;

[0040] 20-Second receiving module, 21-Optical receiver, 22-First signal processing unit, 221-Analog-to-digital converter, 222-Digital signal processor;

[0041] 30 - Logic Module;

[0042] 40 - Control module. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to up, down, left, and right in the actual use or working state of the device, specifically the drawing directions in the accompanying drawings.

[0044] This application provides an optical signal receiving system and an optical module, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0045] To address the problem that in certain scenarios, single optical LOS detection in existing technologies may fail to effectively identify signal loss, thus affecting the accuracy and reliability of optical signal detection, one embodiment of this application provides an optical signal receiving system. This optical signal receiving system includes a first receiving module, a second receiving module, and logic modules respectively connected to the first and second receiving modules. A detailed description follows.

[0046] Please see Figure 1 , Figure 1 A schematic diagram of the first architecture of an optical signal receiving system 1 provided for an exemplary embodiment of the present disclosure.

[0047] In this embodiment, the optical signal receiving system 1 includes a first receiving module 10, a second receiving module 20, and a logic module 30 connected to the first receiving module 10 and the second receiving module 20 respectively. The first receiving module 10 and the second receiving module 20 are configured to receive optical signals from the same light source.

[0048] Optionally, the first receiving module 10 is used to perform optical LOS detection of the optical signal. The second receiving module 20 is used to perform electrical LOS detection of the optical signal. The logic module 30 is used to select and output a first comparison result or a second comparison result according to user detection requirements or specific application scenarios. The optical signal receiving system 1 is used to receive the optical signal emitted by the optical transmitter and output through the optical fiber to determine whether there is signal attenuation in the received optical signal. The first receiving module 10 and the second receiving module 20 can receive optical signals from the same light source. Here, the same light source means that the first receiving module 10 and the second receiving module 20 receive the same beam of light from the optical fiber. This ensures the consistency of detection, avoids detection errors caused by differences in the light source, and ensures that the signal data on which optical LOS detection and electrical LOS detection are based are consistent, allowing the detection results of the two to be mutually verified and reducing the possibility of misjudgment.

[0049] like Figure 1 As shown, the first receiving module 10 includes a photoelectric conversion unit 11 and a comparator 12 connected to each other. The photoelectric conversion unit 11 receives an optical signal and converts the optical signal into a first voltage signal. The comparator 12 receives the first voltage signal and compares the voltage value of the first voltage signal with a preset threshold to output a first comparison result. The preset threshold is a voltage threshold corresponding to an optical power threshold.

[0050] The second receiving module 20 includes an optical receiver 21 and a first signal processing unit 22 connected to each other. The optical receiver 21 is used to receive optical signals and convert them into a second voltage signal. The first signal processing unit 22 is used to demodulate the second voltage signal and output a second comparison result based on the demodulated signal.

[0051] The logic module 30 is used to receive the first comparison result and the second comparison result, and output the first comparison result and / or the second comparison result.

[0052] In one embodiment of this application, the preset threshold is a voltage threshold corresponding to the optical power threshold. There is a correlation between optical power and voltage; whether an optical signal attenuates needs to be determined in conjunction with the optical power. In this embodiment, for ease of comparison, based on the correlation between optical power and voltage, the voltage threshold corresponding to the optical power threshold is determined as the preset threshold. Then, the voltage value of the first voltage signal is compared with the preset threshold to obtain a first comparison result.

[0053] Specifically, for the first receiving module 10, after the light transmitted through the optical fiber illuminates the photoelectric conversion unit 11 of the first receiving module 10, the photoelectric conversion unit 11 converts the received optical signal into a first voltage signal and transmits the first voltage signal to the comparator 12. After receiving the first voltage signal, the comparator 12 compares the first voltage signal with a preset threshold to generate a first comparison result. The configuration of the first receiving module 10 can quickly respond to significant attenuation or interruption of the optical signal, thereby improving the ability of the optical signal receiving system 1 to sense signal loss. The first comparison result can be a high-level signal or a low-level signal. When the voltage value of the first voltage signal is greater than or equal to the preset threshold, a high-level signal is output. The high-level signal indicates that the detected optical signal has not experienced signal attenuation, or that the signal attenuation is within the normal range. When the voltage value of the first voltage signal is less than the preset threshold, a low-level signal is output. The low-level signal indicates that the detected optical signal has experienced significant attenuation.

[0054] Optionally, for the second receiving module 20, after the optical signal transmitted through the optical fiber reaches the optical receiver 21 of the second receiving module 20, the optical receiver 21 converts the received optical signal into a second voltage signal, transmits the second voltage signal to the first signal processing unit 22 for demodulation, and outputs a second comparison result based on the demodulated signal. The configuration of the second receiving module 20 comprehensively considers the integrity of the modulated optical signal, thereby reducing misjudgments caused by optical power fluctuations or transient interference, and improving the system's anti-interference capability. The second comparison result can be a high-level signal or a low-level signal.

[0055] The logic module 30 can receive a first comparison result from the first receiving module 10 and a second comparison result from the second receiving module 20. Since the optical signal receiving system 1 of this application can realize electrical LOS detection and optical LOS detection, in conjunction with the logic module 30, it can output corresponding comparison results according to the actual needs of users and specific application scenarios, so that the system can flexibly adapt to different application scenarios.

[0056] Please see Figure 2 , Figure 2 A schematic diagram of the second architecture of an optical signal receiving system 1 provided for an exemplary embodiment of this disclosure.

[0057] In one embodiment of this application, the photoelectric conversion unit 11 may include a photodetector 111, a logarithmic amplifier 112, and a transimpedance amplifier 113 connected in sequence. The input terminal of the photodetector 111 receives an optical signal, and its output terminal is connected to the logarithmic amplifier 112 to provide a current signal corresponding to the optical signal. The input terminal of the logarithmic amplifier 112 is connected to the output terminal of the photodetector 111 and receives the current signal, amplifies it, and inputs it to the transimpedance amplifier 113. The input terminal of the transimpedance amplifier 113 is connected to the output terminal of the logarithmic amplifier 112 to convert the amplified current signal into a first voltage signal. The output terminal of the transimpedance amplifier 113 is connected to the input terminal of the comparator 12 and sends the first voltage signal to the comparator 12.

[0058] Optionally, the photodetector 111 may be, for example, a PIN photodiode. The photodetector 111 can directly sense the intensity of the light signal and can quickly detect changes in light power, thereby improving the system's response speed to signal loss.

[0059] Optionally, the logarithmic amplifier 112 amplifies the current signal output by the photodetector 111, enabling optical LOS detection to be applicable to situations with a large dynamic range of optical signals. For example, when the optical power is low, the logarithmic amplifier 112 can enhance the signal, allowing it to still be used for subsequent comparative analysis, improving the system's ability to identify weak light signals, thereby increasing the sensitivity of optical LOS detection and reducing false positives for weak signals, thus improving the accuracy of optical LOS detection. Simultaneously, since the intensity of the optical signal may fluctuate significantly with changes in environment and transmission distance, the logarithmic amplifier 112 can normalize signals of different intensities, improving the system's adaptability.

[0060] Optionally, for the transimpedance amplifier 113, the amplified current signal is converted into a corresponding voltage signal, enabling the comparator 12 to directly perform threshold comparison based on the voltage value, ensuring the stability of signal processing. Simultaneously, the gain of the transimpedance amplifier 113 can be optimized, ensuring that the converted voltage signal accurately reflects changes in optical power, and that the transimpedance amplifier 113 can suppress high-frequency noise, improving the signal-to-noise ratio and making the determination of optical signal loss more reliable, thereby improving the accuracy of optical LOS detection.

[0061] The multi-stage signal processing design of the photoelectric conversion unit 11 enables optical LOS detection to not only respond quickly to the loss of optical signal and maintain high detection sensitivity, but also to maintain high detection accuracy and expand the detection range under different optical power levels, thereby improving the reliability of the entire optical signal receiving system 1 in detecting optical signals.

[0062] Please continue reading. Figure 2In one embodiment of this application, the optical signal receiving system 1 further includes a control module 40, which is connected to the first signal processing unit 22, the second signal processing unit 13, and the logic module 30. The control module 40 is used to determine the optical power threshold based on the loss threshold input by the user, the temperature compensation value of the photodetector 111, the frequency compensation value of the photodetector 111, and the dark current compensation value of the photodetector 111, and to determine the first digital signal based on the optical power threshold, and to transmit the first digital signal to the second signal processing unit 13.

[0063] In one embodiment of this application, since crosstalk may exist during optical LOS detection, which may affect the accuracy of the detection results, the optical power threshold can be determined by combining the loss threshold input by the user and related parameters, so as to reduce the impact of optical crosstalk on the detection results and improve the detection reliability of the optical signal receiving system 1.

[0064] Specifically, the relevant parameters may include the temperature compensation value of the photodetector 111, the frequency compensation value of the photodetector 111, and the dark current compensation value of the photodetector 111.

[0065] The user-defined loss threshold can be represented by LOS Threshold, in dBm; the temperature compensation value can be represented by Temp offset, in dB; the frequency compensation value can be represented by Freq offset, in dB; and the dark current compensation value can be represented by Dark power, in dBm.

[0066] Where Freq offset = freq * K1 + B1; freq is the frequency of the optical signal, K1 is the first linear fitting coefficient of frequency compensation, and B1 is the second linear fitting coefficient of frequency compensation.

[0067] Temp offset = temp * K2 + B2; temp is the current temperature of photodetector 111, K2 is the first linear fitting coefficient of temperature compensation, and B2 is the second linear fitting coefficient of temperature compensation.

[0068] Dark power = Dark power ADC * K3 + B3; Dark power ADC is the theoretical dark current value, K3 is the first peak linear fitting coefficient, and B3 is the second peak linear fitting coefficient.

[0069] Where Dark power ADC = ADC_pd * coefficient; ADC_pd is the actual optical power value collected under no incident light conditions, and coefficient is the dark current compensation coefficient.

[0070] Furthermore, a preset threshold LOSDAC is determined based on the frequency compensation value, temperature compensation value, dark current compensation value, and loss threshold.

[0071] LOSDAC=(LOS_th(dBm)–B3) / K3*4095 / 65535;

[0072] Where LOS_th(dBm) = 10*log10(LOS_th(mw) / 1);

[0073] LOS_th(mw)=pow(10,(LOS Threshold+Freq offset+Temp offset) / 10)+pow(10,Dark power / 10).

[0074] In one embodiment of this application, by adding dark current compensation on top of temperature compensation and frequency compensation, the impact of dark current caused by optical crosstalk on signal loss detection can be effectively reduced, thereby improving the accuracy of detection.

[0075] Please continue reading. Figure 2 In one embodiment of this application, the first receiving module 10 further includes a second signal processing unit 13. The second signal processing unit 13 is connected to the comparator 12 and is used to receive a first digital signal and convert the first digital signal into a third voltage signal for transmission to the comparator 12. The first digital signal carries information representing a preset threshold, and the voltage value of the third voltage signal is equal to the preset threshold.

[0076] In one embodiment of this application, the first receiving module 10 further includes a second signal processing unit 13. The second signal processing unit 13 can dynamically adjust the detection range for optical LOS detection of optical signals, so that optical signals with optical power in the range of -16dBm to -37dBm can be used for optical LOS detection by the optical signal receiving system 1. Please refer to... Figure 2 The input terminal of the second signal processing unit 13 is connected to the control module 40, and the output terminal is connected to the comparator 12. The second signal processing unit 13 receives the first digital signal sent by the control module 40, converts the first digital signal into a third voltage signal, and sends it to the comparator 12. The first digital signal is a digital signal sent by the control module 40 based on user detection requirements or a specific application scenario. It carries information that can characterize a preset threshold, so that after receiving the first digital signal, the second signal processing unit 13 can convert the first digital signal according to the information carried by the first digital signal to obtain the third voltage signal. The voltage value of the third voltage signal is the same as the preset threshold, that is, the voltage value of the third voltage signal is sent to the comparator 12 as the preset threshold.

[0077] By adding a second signal processing unit 13 to the first receiving module 10 and dynamically adjusting the preset threshold in conjunction with the first digital signal, it can adapt to different detection scenarios and improve detection flexibility. Furthermore, it is compatible with multiple optical communication standards, enhancing system versatility and making it suitable for different transmission rates and optical devices.

[0078] Figure 3 A schematic diagram of a third architecture of an optical signal receiving system 1 provided for an exemplary embodiment of this disclosure. Please refer to... Figure 3 The second signal processing unit 13 may be a digital-to-analog converter 131. The digital-to-analog converter 131 has flexible signal conversion capabilities, enabling it to process digital signals of different resolutions and sampling rates and convert them into analog signals. In one embodiment of this application, the input terminal of the digital-to-analog converter 131 is connected to the control module 40, and the output terminal is connected to the comparator 12 to receive a first digital signal, convert it into a third voltage signal, and send it to the comparator 12.

[0079] Please continue reading. Figure 3 In one embodiment of this application, the first signal processing unit 22 includes:

[0080] Analog-to-digital converter 221 is used to receive the second voltage signal and convert the second voltage signal into a second digital signal;

[0081] The digital signal processor 222 is used to receive the second digital signal and demodulate the second digital signal to obtain a demodulated signal.

[0082] In one embodiment of this application, electrical LOS detection is implemented based on a second receiving module 20. The second receiving module 20 includes a first signal processing unit 22, which may include an analog-to-digital converter 221 and a digital signal processor 222.

[0083] Optionally, the optical signal emitted by the optical transmitter carries modulation information. After receiving the optical signal carrying modulation information, the optical receiver 21 converts it into a second voltage signal and sends it to the analog-to-digital converter 221. The analog-to-digital converter 221 converts the second voltage signal into a corresponding second digital signal and sends it to the digital signal processor 222.

[0084] Specifically, in the optical signal receiving system 1, the digital signal processor 222 can be a DSP (Digital Signal Processor). The DSP 222 can be viewed as a demodulator used to demodulate the second digital signal, and it will operate at different rates. After demodulating the second digital signal, the DSP 222 obtains a corresponding demodulated signal. Based on the demodulated signal, it can determine whether an electrical loss of order (LOS) has occurred in the optical signal, and then generate a second comparison result. For example, during demodulation, signal characteristics (such as amplitude, signal-to-noise ratio, bit error rate, etc.) are detected to determine whether the signal is valid. If valid, it can be considered that no LOS has occurred, and the output second comparison result is a high-level signal; if invalid, it can be considered that an LOS has occurred, and the output second comparison result is a low-level signal.

[0085] In the optical signal receiving system 1 of this application, an analog-to-digital converter 221 and a digital signal processor 222 are introduced for the detection of electrical LOS, which can improve the identification accuracy of electrical LOS, reduce false judgments, ensure accurate detection when the signal is lost, and adapt to different operating rates and modulation methods, thereby enhancing the system flexibility.

[0086] In one embodiment of this application, the first signal processing unit 22 is further configured to output a third comparison result when the signal transmission rate of the second digital signal is different from the operating rate of the digital signal processor 222;

[0087] Alternatively, the first signal processing unit 22 is also configured to output a third comparison result in the absence of a second digital signal;

[0088] Alternatively, the first signal processing unit 22 is also used to output a third comparison result when the signal strength of the second digital signal is not within the preset signal strength range.

[0089] In one embodiment of this application, during the electrical LOS detection process, the digital signal processor 222 has different operating modes corresponding to different operating rates, such as 100G / 200G / 300G / 400G; the operating rate of the digital signal processor 222 can be configured according to the control module 40.

[0090] When the second digital signal is absent, it can be assumed that the optical signal has been lost, and demodulation is impossible. This indicates an electrical loss of order (LOS) in the optical signal, and a third comparison result is output. Alternatively, if the signal transmission rate of the second digital signal corresponding to the optical signal is mismatched, the digital signal processor 222 also cannot demodulate the second digital signal, thus outputting a third comparison result. Or, if the signal strength of the second digital signal is outside the preset signal strength range, the digital signal processor 222 also cannot demodulate the second digital signal, thus outputting a third comparison result. The preset signal strength range can be adaptively adjusted according to the operating mode of the digital signal processor 222.

[0091] Optionally, since the third comparison result corresponds to the case where the digital signal processor 222 fails to demodulate, the third comparison result is a low-level signal. Based on this, the second comparison result corresponds to the case where the digital signal processor 222 successfully demodulates and can normally determine whether the optical signal has an electrical loss of order (LOS), therefore the second comparison result is either a high-level signal or a low-level signal.

[0092] In one embodiment of this application, the control module 40 is used to receive a first switching command input by the user and, in response to the first switching command, switch the logic module 30 to optical signal mode, and the logic module 30 outputs a first comparison result in optical signal mode.

[0093] The control module 40 is used to receive the second switching command input by the user and, in response to the second switching command, switch the logic module 30 to the electrical signal mode. The logic module 30 outputs the second comparison result in the electrical signal mode.

[0094] The control module 40 is used to receive a third switching command input by the user and switch the logic module 30 to photoelectric signal mode in response to the third switching command. The logic module 30 outputs a first comparison result and / or a second comparison result in photoelectric signal mode.

[0095] Optionally, optical LOS detection can obtain a first comparison result, while electrical LOS detection can output a second or third comparison result. For the optical signal receiving system 1, whether it outputs the first, second, or third comparison result through the logic module 30 can be determined based on the user-input switching command.

[0096] Specifically, the user-input switching commands correspond to the operating modes of the logic module 30. The first switching command corresponds to the optical signal mode, used to output the first comparison result of optical LOS detection; the second switching command corresponds to the electrical signal mode, used to output the second or third comparison result of electrical LOS detection; and the third switching command corresponds to the photoelectric signal mode, used to combine the first and second comparison results or the first and third comparison results to determine the final output. By inputting different switching commands, the user causes the logic module 30 to output the final detection result.

[0097] The control module 40 receives switching commands input by the user and adjusts the working mode of the logic module 30 according to the commands, providing greater flexibility and reliability in optical LOS detection and electrical LOS detection.

[0098] In one embodiment of this application, when the logic module 30 is in photoelectric signal mode, the logic module 30 is used to receive and detect the first comparison result and the second comparison result, and output a high-level signal when the first comparison result and / or the second comparison result are high-level signals.

[0099] Alternatively, logic module 30 may also output a low-level signal when both the first comparison result and the second comparison result are low-level signals.

[0100] Specifically, when the logic module 30 corresponds to the optical signal mode, the logic module 30 directly outputs the first comparison result corresponding to the optical signal mode; when the logic module 30 corresponds to the electrical signal mode, the logic module 30 directly outputs the second or third comparison result corresponding to the electrical signal mode.

[0101] When logic module 30 corresponds to the photoelectric signal mode, it first needs to determine whether the first comparison result is a high-level signal or a low-level signal. If the first comparison result is a high-level signal, the final output is a high-level signal. If the first comparison result is a low-level signal, it then determines whether the second comparison result is a high-level signal or a low-level signal. If the second comparison result is a high-level signal, the final output is a high-level signal. Only when both the first and second comparison results are low-level signals will the low-level signal be used as the final output.

[0102] Optionally, when the detection result corresponding to the electrical LOS detection is the third comparison result, the third comparison result can be determined to be a low-level signal. Since a low-level signal is only output when the detection results of electrical LOS detection and optical LOS detection are consistent, and a high-level signal is output when the detection results are inconsistent, the level signal corresponding to the first comparison result can be directly output after judging the first comparison result.

[0103] When the first comparison result, the second comparison result, or the first comparison result and the third comparison result are all the same level signal, the final output level signal corresponds to both the first comparison result and the second comparison result or the third comparison result. Therefore, it can be considered that the logic module 30 outputs the first comparison result and the second comparison result in photoelectric signal mode.

[0104] When the first comparison result, the second comparison result, or the first comparison result and the third comparison result are different level signals, the final output level signal corresponds to one of the first comparison result or the second comparison result. Therefore, it can be considered that the logic module 30 outputs the first comparison result or the second comparison result in photoelectric signal mode.

[0105] This application also provides an optical module, which includes an optical emitting device and an optical receiving device. The optical receiving module includes the optical signal receiving system 1 as described in any of the above embodiments.

[0106] The optical signal receiving system provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical signal receiving system, characterized in that, The optical signal receiving system includes a first receiving module, a second receiving module, and a logic module connected to the first receiving module and the second receiving module respectively. The first receiving module and the second receiving module are configured to receive optical signals from the same light source. The first receiving module includes a photoelectric conversion unit and a comparator connected to each other. The photoelectric conversion unit is used to receive the optical signal and convert the optical signal into a first voltage signal. The comparator is used to receive the first voltage signal and compare the voltage value of the first voltage signal with a preset threshold to output a first comparison result. The preset threshold is a voltage threshold corresponding to an optical power threshold. The second receiving module includes an optical receiver and a first signal processing unit connected to each other. The optical receiver is used to receive the optical signal and convert the optical signal into a second voltage signal. The first signal processing unit is used to demodulate the second voltage signal and output a second comparison result based on the demodulated signal. The logic module is used to receive the first comparison result and the second comparison result, and output the first comparison result and / or the second comparison result.

2. The optical signal receiving system according to claim 1, characterized in that, The first receiving module further includes a second signal processing unit connected to the comparator, which receives a first digital signal and converts the first digital signal into a third voltage signal for transmission to the comparator; wherein the first digital signal carries information characterizing the preset threshold, and the voltage value of the third voltage signal is equal to the preset threshold.

3. The optical signal receiving system according to claim 1, characterized in that, The photoelectric conversion unit includes: A photodetector is used to receive the optical signal and convert the optical signal into a current signal; A logarithmic amplifier is used to amplify the current signal converted by the photodetector; A transimpedance amplifier is used to convert the current signal output by the logarithmic amplifier into the first voltage signal and output it to the comparator.

4. The optical signal receiving system according to claim 2 or 3, characterized in that, The optical signal receiving system further includes a control module, which is connected to the first signal processing unit, the second signal processing unit, and the logic module. The control module is used to determine the optical power threshold based on the loss threshold input by the user, the temperature compensation value of the photodetector, the frequency compensation value of the photodetector, and the dark current compensation value of the photodetector, and to determine the first digital signal based on the optical power threshold, and to transmit the first digital signal to the second signal processing unit.

5. The optical signal receiving system according to claim 1, characterized in that, The first signal processing unit includes: An analog-to-digital converter is used to receive the second voltage signal and convert the second voltage signal into a second digital signal; A digital signal processor is used to receive the second digital signal and demodulate the second digital signal to obtain the demodulated signal.

6. The optical signal receiving system according to claim 5, characterized in that, The first signal processing unit is further configured to output a third comparison result when the signal transmission rate of the second digital signal is different from the operating rate of the digital signal processor; Alternatively, the first signal processing unit is further configured to output the third comparison result in the absence of the second digital signal; Alternatively, the first signal processing unit may further be configured to output the third comparison result when the signal strength of the second digital signal is not within a preset signal strength range.

7. The optical signal receiving system according to claim 4, characterized in that, The control module is used to receive a first switching command input by the user and, in response to the first switching command, switch the logic module to optical signal mode. The logic module outputs the first comparison result in the optical signal mode. The control module is used to receive a second switching command input by the user and, in response to the second switching command, switch the logic module to electrical signal mode, wherein the logic module outputs the second comparison result in the electrical signal mode; The control module is used to receive a third switching command input by the user and, in response to the third switching command, switch the logic module to photoelectric signal mode. The logic module outputs the first comparison result or the second comparison result in the photoelectric signal mode.

8. The optical signal receiving system according to claim 7, characterized in that, The first comparison result is a high-level signal or a low-level signal, and the second comparison result is the high-level signal and / or the low-level signal; When the logic module is in the photoelectric signal mode, the logic module is used to receive and detect the first comparison result and the second comparison result, and output the high-level signal when the first comparison result and / or the second comparison result is the high-level signal.

9. The optical signal receiving system according to claim 8, characterized in that, When the logic module is in the photoelectric signal mode, the logic module is further configured to output the low-level signal when both the first comparison result and the second comparison result are the low-level signal.

10. An optical module, characterized in that, It includes an optical emitting device and an optical receiving device, wherein the optical receiving device includes an optical signal receiving system as described in any one of claims 1 to 9.

Images