Optical module and optical fiber link online monitoring system

Abstract

The utility model provides an optical module and an optical fiber link online monitoring system, and relates to the technical field of optical communication. The optical module comprises an optical detector, a trans-impedance amplifier and a monitoring unit, and the optical detector is used for receiving a data optical signal and a detection optical signal which are input through an external optical fiber and converting the data optical signal and the detection optical signal into a data electric signal and a detection electric signal respectively. The input end of the transimpedance amplifier is electrically connected with the optical detector so as to receive data electric signals and detection electric signals output by the optical detector. The low-speed sampling end of the transimpedance amplifier is electrically connected with the sampling part of the monitoring unit, and the sampling part obtains a sampling signal through the low-speed sampling end and transmits the sampling signal to the control and processor; and the control and processor is used for processing an alternating current sampling signal in the sampling signals so as to determine the fault position of the external optical fiber. On the basis of low cost, real-time monitoring and online breakpoint detection can be carried out on the optical fiber link.

Description

Technical Field

[0001] This application relates to the field of optical communication, and more specifically, to an online monitoring system for optical modules and fiber optic links. Background Technology

[0002] With the development of optical communication services, more and more optical modules are being used in optical transmission processes. However, optical fibers are usually laid underground, making it crucial to accurately locate the break if one occurs. Furthermore, with the increase in optical module speeds, such as those based on four-level pulse amplitude modulation (PAM4), these modules are highly sensitive to reflection points on the optical communication link. Multiple reflections can cause multipath interference, thus affecting the module's speed. Therefore, real-time monitoring and break detection of the optical fiber link are essential.

[0003] Typically, dedicated reflection point and breakpoint detection equipment is set up to monitor and detect breakpoints in fiber optic links. A commonly used breakpoint detection device is the Optical Time-Domain Reflectometer (OTDR). However, this equipment can only perform offline testing, requiring personnel to go to the site, disconnect the fiber from the optical module, and then connect it to the OTDR for testing. Since optical modules in telecommunications networks are usually located outdoors, this is extremely inconvenient for maintenance and significantly increases the manpower costs of testing.

[0004] Therefore, there is an urgent need for a low-cost detection solution to monitor fiber optic links in real time and detect breakpoints online. Utility Model Content

[0005] The purpose of this application is to provide an online monitoring system for optical modules and fiber optic links, which can perform real-time monitoring and online breakpoint detection of fiber optic links at low cost.

[0006] In a first aspect, this application provides an optical module, which includes at least:

[0007] A photodetector is used to optically connect to an external optical fiber to receive data optical signals and detection optical signals input through the external optical fiber, and converts the received data optical signals into data electrical signals and the received detection optical signals into detection electrical signals.

[0008] A transimpedance amplifier includes at least an input terminal, a low-speed sampling terminal, and a high-speed sampling terminal. The input terminal is electrically connected to a photodetector to receive the data electrical signal and the detection electrical signal output by the photodetector. The high-speed sampling terminal is electrically connected to a data recovery unit to output a high-speed electrical signal processed by the transimpedance amplifier to the data recovery unit.

[0009] The monitoring unit includes a sampling section and a control and processor. The sampling section is electrically connected to the low-speed sampling terminal of the transimpedance amplifier to acquire the sampling signal through the low-speed sampling terminal and transmit the sampling signal to the control and processor.

[0010] The sampling signal includes an AC sampling signal that samples the detected electrical signal. The control and processor are used to process the AC sampling signal to determine the fault location of the external optical fiber.

[0011] Optionally, the bandwidth of the low-speed sampling end is greater than 0.75 times the bandwidth of the detection optical signal.

[0012] Optionally, the sampling unit includes at least a fault sampling subunit; the first end of the fault sampling subunit is electrically connected to the low-speed sampling end; the second end of the fault sampling subunit is connected to the control and processor.

[0013] The fault sampling subunit is used to sample the AC sampling signal in the sampling signal to obtain the detection data signal. The control and processor is used to analyze and process the detection data signal to determine the fault location of the external optical fiber.

[0014] Optionally, the fault sampling subunit includes an amplifier and a high-speed analog-to-digital converter;

[0015] The amplifier is electrically connected to the low-speed sampling terminal of the transimpedance amplifier to amplify the AC sampling signal in the sampling signal and transmit the amplified AC sampling signal to the high-speed analog-to-digital converter.

[0016] The high-speed analog-to-digital converter is electrically connected to the amplifier and the control and processor respectively. It is used to sample the amplified AC sampling signal to obtain the detection data signal and transmit it to the control and processor.

[0017] Optionally, the fault sampling subunit also includes a coupling capacitor, which is electrically connected between the low-speed sampling terminal of the transimpedance amplifier and the amplifier; the coupling capacitor is used to isolate the DC signal in the sampling signal.

[0018] Optionally, the fault sampling subunit also includes a bandpass filter with a preset frequency band range, which is electrically connected between the amplifier and the high-speed analog-to-digital converter; the bandpass filter is used to filter the amplified AC sampling signal.

[0019] Optionally, the controller and processor include a breakpoint detection processing unit, which receives detection data signals and analyzes and processes the detection data signals to determine the fault location of the external optical fiber.

[0020] Optionally, the sampling unit may further include an intensity sampling subunit, and the control and processor may further include a signal strength monitoring unit;

[0021] The intensity sampling subunit is electrically connected to the low-speed sampling terminal of the transimpedance amplifier and the signal intensity monitoring unit. The signal intensity monitoring unit obtains the DC sampling signal in the sampling signal through the intensity sampling subunit to monitor the intensity of the data optical signal and / or detect the intensity of the optical signal.

[0022] Optionally, the intensity sampling subunit includes a sampling resistor; the first end of the sampling resistor is electrically connected to the low-speed sampling end of the transimpedance amplifier and the signal strength monitoring unit, and the second end is grounded;

[0023] The AC sampling signal from the low-speed sampling terminal is transmitted to the fault sampling subunit, and the DC sampling signal is transmitted to the sampling resistor; the signal strength monitoring unit obtains the DC sampling signal through the sampling resistor.

[0024] Optionally, the low-speed sampling terminal is the RSSI pin of the transimpedance amplifier.

[0025] Secondly, this application also provides an online monitoring system for optical fiber links, including an optical fiber for optical network transmission and the optical module described in the first aspect above, wherein the optical module is optically connected to the optical fiber for optical network transmission.

[0026] The online monitoring system for optical modules and fiber optic links provided in this application has the following beneficial effects:

[0027] In this application, one photodetector in the optical module is used to receive both data optical signals for normal communication and detection optical data for breakpoint detection, enabling real-time monitoring and online breakpoint detection of the fiber optic link. In this optical module, communication and detection share a single photodetector, eliminating the need for additional photodetectors and effectively saving on module costs. Furthermore, the monitoring unit is electrically connected to the low-speed sampling end of the transimpedance amplifier, acquiring the detection electrical signal from this end to determine the location of the external fiber optic fault. The monitoring unit for breakpoint detection does not need to be connected to the high-speed link within the optical module, thus avoiding interference with the normal communication signal transmission and preventing the interference that occurs with the high-speed link for normal communication when sharing a single photodetector. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is one of the structural schematic diagrams of the optical module in the embodiments of this application;

[0030] Figure 2 This is the second schematic diagram of the optical module in the embodiments of this application;

[0031] Figure 3 This is the third schematic diagram of the optical module structure in the embodiments of this application;

[0032] Figure 4 This is one of the structural schematic diagrams of the fault sampling subunit in the embodiments of this application;

[0033] Figure 5 This is the second schematic diagram of the structure of the fault sampling subunit in the embodiments of this application;

[0034] Figure 6 This is the third schematic diagram of the structure of the fault sampling subunit in the embodiments of this application;

[0035] Figure 7 This is a schematic diagram of the monitoring unit in an embodiment of this application;

[0036] Figure 8 This is the fourth schematic diagram of the optical module in the embodiments of this application;

[0037] Figure 9 This is a circuit diagram of the optical module in an embodiment of this application.

[0038] Icons: 100-Optical Module; 101-Photodetector; 102-Transimpedance Amplifier; 103-Monitoring Unit; 104-External Fiber Optic Cable; 105-Data Recovery Unit; 102A-Input Terminal; 102B-Low-Speed ​​Sampling Terminal; 102C-High-Speed ​​Sampling Terminal; 201-Sampling Unit; 202-Control and Processor; 301-Fault Sampling Subunit; 302-Breakpoint Detection and Processing Unit; 303-Intensity Sampling Subunit; 304-Signal Intensity Monitoring Unit; 401-Amplifier; 402-High-Speed ​​Analog-to-Digital Converter; 403-Coupling Capacitor; 404-Bandpass Filter; R1-Sampling Resistor. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0042] In the description of this utility model, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0043] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0045] As described in the background section, existing technologies often use offline detection to monitor fiber optic links and detect breakpoints, which incurs high manpower costs.

[0046] Based on this, this application provides an online monitoring system for optical modules and fiber optic links, so as to achieve real-time monitoring and online breakpoint detection of fiber optic links at low cost.

[0047] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of an optical module receiver is shown. In this embodiment, the optical module 100 includes at least a photodetector 101, a transimpedance amplifier 102, and a monitoring unit 103.

[0048] The photodetector 101 is optically connected to an external optical fiber 104 to receive data optical signals and detection optical signals input through the external optical fiber 104, and converts the received data optical signals into data electrical signals and the received detection optical signals into detection electrical signals.

[0049] The transimpedance amplifier 102 includes at least an input terminal 102A, a low-speed sampling terminal 102B, and a high-speed sampling terminal 102C. The input terminal 102A is electrically connected to the photodetector 101 to receive the detection electrical signal and data electrical signal output by the photodetector 101. The high-speed sampling terminal 102C is electrically connected to a data recovery unit 105 to output the high-speed electrical signal processed by the transimpedance amplifier 102 to the data recovery unit 105.

[0050] Please continue to refer to this. Figure 1 In this embodiment, the monitoring unit 103 includes a sampling unit 201 and a control and processor 202. The sampling unit 201 is electrically connected to the low-speed sampling terminal 102B of the transimpedance amplifier 102 to acquire the sampling signal through the low-speed sampling terminal 102B and transmit the sampling signal to the control and processor 202.

[0051] In this embodiment, the sampling signal includes an AC sampling signal obtained by sampling the detection electrical signal. The control and processor 202 can be used to process the AC sampling signal to determine the fault location of the external optical fiber 104.

[0052] It should be noted that in this embodiment, the electrical signals output by the transimpedance amplifier 102 through the low-speed sampling terminal 102B and the high-speed sampling terminal 102C are different components of the output signal of the transimpedance amplifier 102.

[0053] In this embodiment, one photodetector in the optical module is used to receive both data optical signals for normal communication and detection optical data for breakpoint detection. This enables real-time monitoring and online breakpoint detection of the fiber optic link, saving manpower costs during detection. In this optical module, communication and detection share a single photodetector, eliminating the need for additional photodetectors and effectively reducing module costs. Furthermore, the monitoring unit is electrically connected to the low-speed sampling end of the transimpedance amplifier, acquiring detection electrical signals from this end to determine the location of faults in the external fiber optic cable. The monitoring unit for breakpoint detection does not need to be connected to the high-speed link in the optical module, thus avoiding interference with the high-speed link for normal communication, a problem that can occur when sharing a single photodetector.

[0054] For details, please refer to Figure 2, Figure 2 The diagram illustrates the specific connection relationship between the photodetector and the transimpedance amplifier in the optical module. In this embodiment, the photodetector 101 is a photodiode (PD), and the transimpedance amplifier 102 is a transimpedance amplifier chip (TIA). The PD and TIA are connected. The TIA receives external power supply VCC and supplies power to the PD, enabling the PD to operate under reverse bias. The transimpedance amplifier 102 performs I / V conversion on the signal sent from the photodiode PD, and then outputs a high-speed electrical signal to the data recovery unit 105 through the high-speed sampling terminal 102C on the transimpedance amplifier 102. Simultaneously, a sampling signal is output to the monitoring unit 103 through the low-speed sampling terminal 102B on the transimpedance amplifier 102 to determine breakpoint detection or real-time monitoring.

[0055] In this embodiment, the low-speed sampling terminal 102B is the Received Signal Strength Indicator (RSSI) pin of the aforementioned TIA. The monitoring unit used for breakpoint detection obtains the detection electrical signal from this RSSI pin of the TIA to determine the fault location of the external optical fiber. This does not require connection to the high-speed link in the optical module and will not affect the transmission of normal communication signals. Moreover, it eliminates the need for additional photodetectors, effectively saving costs.

[0056] Please continue to refer to this. Figure 2 During normal operation, the optical module 100 may only receive data optical signals. The photodetector 101 converts the received data optical signals into data electrical signals and transmits them to the transimpedance amplifier 102. The transimpedance amplifier 102 performs I / V conversion and amplification on the received data electrical signals and outputs them to the data recovery unit 105 of the optical module 100 through the high-speed sampling terminal 102C. In this embodiment, the data recovery unit 105 can be a digital signal processor (DSP) or a clock and data recovery unit (CDR).

[0057] Please continue to refer to this. Figure 2When an malfunction occurs, the optical module 100 may not receive data optical signals. In this case, the breakpoint detection function of the optical module 100 is activated, emitting a low-speed modulated detection optical signal. During breakpoint detection, the optical module 100 may only receive the detection optical signal. The photodetector 101 converts the received detection optical signal into a detection electrical signal and transmits it to the transimpedance amplifier 102. The transimpedance amplifier 102 amplifies the received detection electrical signal and outputs it from the low-speed sampling terminal 102B. Since the detection optical signal is a low-speed modulated signal, it contains an AC component after conversion to an electrical signal. The sampling unit 201 of the monitoring unit 103 acquires the sampling signal from the low-speed sampling terminal 102B and transmits the AC sampling signal therein to the control and processor 202. The control and processor 202 processes this AC sampling signal to determine the location of the external optical fiber fault.

[0058] Please continue to refer to this. Figure 2 In some embodiments, a detection optical signal can be loaded into the data optical signal of normal communication, and the optical module 100 can simultaneously receive the data optical signal and the detection optical signal. The photodetector 101 simultaneously receives the data optical signal and the detection optical signal and converts them into electrical signals. The transimpedance amplifier 102 processes the received electrical signals, and outputs the high-speed electrical signal representing the data electrical signal from the high-speed sampling terminal 102C, and the low-speed electrical signal representing the detection electrical signal from the low-speed sampling terminal 102B.

[0059] In summary, the optical module provided in this application can achieve real-time monitoring and online breakpoint detection of optical fiber links at low cost through the above-mentioned device architecture, overcoming the technical problem of excessively high labor costs in the prior art; at the same time, it also has conventional communication functions.

[0060] Furthermore, to ensure accurate recovery of the modulated signal and obtain a more complete demodulated signal, thereby improving the accuracy of the real-time monitoring and online breakpoint detection functions of the optical module in this application, the bandwidth of the low-speed sampling end in this embodiment is greater than 0.75 times the bandwidth of the detection optical signal. In one possible implementation, the bandwidth of the low-speed sampling end in this application can be 0.75 times the bandwidth of the detection optical signal or 1 times the bandwidth of the detection optical signal, etc.

[0061] It should be noted that this embodiment does not limit the structural configuration of the monitoring unit 103 downsampling unit 201 and the control and processor 202, as well as the connection relationship between the various structures, as long as the sampling signal can be obtained through the low-speed sampling terminal 102B and the sampling signal can be processed to determine the fault location of the external optical fiber 104.

[0062] In one possible implementation method, please Figure 1 Based on, refer to Figure 3 , Figure 3This illustration shows another structural diagram of the optical module in this application. In this embodiment, the sampling unit 201 includes at least a fault sampling subunit 301; the first end of the fault sampling subunit 301 is electrically connected to the low-speed sampling end 102B; and the second end of the fault sampling subunit 301 is connected to the control and processor 202.

[0063] In this embodiment, the fault sampling subunit 301 can be used to sample the AC sampling signal in the sampling signal to obtain the detection data signal, and then the control and processor 202 is used to analyze and process the detection data signal to determine the fault location of the external optical fiber 104.

[0064] In one possible implementation method, please Figure 3 Based on, refer to Figure 4 , Figure 4 A schematic diagram of the fault sampling subunit in this application is shown. In this embodiment, the fault sampling subunit 301 includes an amplifier 401 and a high-speed analog-to-digital converter 402. The amplifier 401 is electrically connected to the low-speed sampling terminal 102B of the transimpedance amplifier 102, and the high-speed analog-to-digital converter 402 is electrically connected to the amplifier 401 and the control and processor 202.

[0065] In this embodiment, amplifier 401 amplifies the AC sampling signal in the sampling signal and transmits the amplified AC sampling signal to high-speed analog-to-digital converter 402. High-speed analog-to-digital converter 402 then samples and performs analog-to-digital conversion on the amplified AC sampling signal to obtain a detection data signal, and transmits the detection data signal to control and processor 202. In this embodiment, the sampling rate of high-speed analog-to-digital converter 402 is greater than or equal to twice the modulation rate of the detection optical signal.

[0066] Please Figure 4 Based on, refer to Figure 5 , Figure 5 This illustration shows another structural diagram of the fault sampling subunit in this application. In this embodiment, the fault sampling subunit 301 further includes a coupling capacitor 403, which is electrically connected between the low-speed sampling terminal 102B of the transimpedance amplifier 102 and the amplifier 401.

[0067] In this embodiment, the coupling capacitor 403 can be used to isolate the DC signal in the sampling signal to avoid the influence of external input light. This influence can be characterized as the different DC biases generated by the external input light under different optical powers. Based on this, this application can use the coupling capacitor 403 to avoid interference from DC bias on signal demodulation.

[0068] To further improve the accuracy of the optical module 100 in this application, please... Figure 5 Based on, refer to Figure 6 , Figure 6This diagram illustrates another structural schematic of the fault sampling subunit in this embodiment. In this embodiment, the fault sampling subunit 301 further includes a bandpass filter 404 with a preset frequency band range, which is electrically connected between the amplifier 401 and the high-speed analog-to-digital converter 402.

[0069] In this embodiment, the bandpass filter 404 is used to filter the amplified AC sampling signal to remove noise outside the preset frequency band, reduce noise interference, and avoid noise affecting the detection results. After filtering by the bandpass filter, an AC sampling signal that meets the preset frequency band range is obtained and input to the high-speed analog-to-digital converter 402 to obtain a more accurate detection data signal, which can improve the accuracy of the optical module 100 in detecting fiber optic breakpoints.

[0070] Please Figure 3 Based on, refer to Figure 7 , Figure 7 The diagram shows the structure of the monitoring unit in this application. In this embodiment, the control and processor 202 includes a breakpoint detection processing unit 302, which is used to receive detection data signals and analyze and process the detection data signals to determine the fault location of the external optical fiber 104.

[0071] In one possible implementation, the controller and processor 202 described above may be, for example, a microcontroller (MCU) that integrates the breakpoint detection processing unit 302 described above.

[0072] In this embodiment, the breakpoint detection processing unit can be an OTDR (Optical Time-Domain Reflectometer) processing unit integrated within the MCU. After receiving the detection data signal, the MCU can process the detection data signal according to the principle of optical time-domain reflection to determine the fault location of the external optical fiber and realize online breakpoint detection.

[0073] The principle of optical time-domain reflectometry is as follows: by determining the time taken from the transmitted signal to the returned signal, and then determining the speed of light in the transmission medium, the distance can be calculated, and this distance is the fault location of the aforementioned external optical fiber.

[0074] In some other embodiments, the method by which the breakpoint detection processing unit processes the detection data signal is not limited, that is, the breakpoint detection processing unit is not limited to processing the detection data signal only based on the principle of optical time-domain reflection.

[0075] In some other embodiments, the breakpoint detection processing unit may also be a separate processing circuit, and is not necessarily integrated into the MCU.

[0076] In this embodiment, the optical module 100 can also monitor the optical signal strength in real time. Figure 7 Based on, refer to Figure 8 , Figure 8 This diagram illustrates another structural schematic of the optical module in this application. In this embodiment, the sampling unit 201 further includes an intensity sampling subunit 303, and the control and processor 202 further includes a signal strength monitoring unit 304.

[0077] The intensity sampling subunit 303 is electrically connected to the low-speed sampling terminal 102B of the transimpedance amplifier 102 and the signal intensity monitoring unit 304. In this embodiment, the signal intensity monitoring unit 304 obtains the DC sampling signal from the sampling signal of the intensity sampling subunit 303 to monitor the intensity of the modulated optical signal.

[0078] In one possible implementation, refer to Figure 9 , Figure 9 The diagram shows a partial circuit schematic of the optical module in this application. In this embodiment, the intensity sampling subunit 303 includes a sampling resistor R1; the first end of the sampling resistor R1 is electrically connected to the low-speed sampling terminal 102B of the transimpedance amplifier 102, and the second end is grounded.

[0079] In this embodiment, the fault sampling subunit 301 is used to acquire the AC sampling signal in the sampling signal output by the low-speed sampling terminal 102B, and the sampling resistor R1 is used to acquire the DC sampling signal in the sampling signal, so that the signal strength monitoring unit 304 can acquire the DC sampling signal from the sampling resistor R1 and realize real-time monitoring of the optical fiber link.

[0080] In this embodiment, the signal strength monitoring unit 304 can also determine the signal strength of the currently acquired DC sampling signal according to a preset threshold, and display the signal strength in real time.

[0081] Please continue to refer to this. Figure 9 In this embodiment, the controller and processor 202 may also include an OTDR MCU component, which can determine the fault location of the external optical fiber through the principle of optical time domain reflectometer. The output terminal of the coupling capacitor 403 is connected to the input terminal of the amplifier 401, and the output terminal of the amplifier 401 is connected to the input terminal of the high-speed analog-to-digital converter 402. The output terminal of the high-speed analog-to-digital converter 402 is connected to the OTDR MCU component.

[0082] In summary, this application provides an optical module including a photodetector, a transimpedance amplifier, and a monitoring unit. The transimpedance amplifier includes at least an input terminal, a low-speed sampling terminal, and a high-speed sampling terminal. The monitoring unit includes a sampling section and a control and processor. The photodetector is connected to an external optical fiber and is used to receive both data optical signals for normal communication and detection optical data for breakpoint detection, enabling real-time monitoring and online breakpoint detection of the optical fiber link. In this optical module, communication and detection share a single photodetector, eliminating the need for additional photodetectors and effectively saving costs. The monitoring unit is electrically connected to the low-speed sampling terminal of the transimpedance amplifier, acquiring detection electrical signals from this terminal to determine the fault location of the external optical fiber. The monitoring unit for breakpoint detection does not need to be connected to the high-speed link in the optical module, thus not affecting the transmission of normal communication signals and avoiding the interference problem that occurs when sharing a single photodetector. Simultaneously, the transimpedance amplifier is also electrically connected to a data recovery unit via the high-speed sampling terminal to output a high-speed electrical signal processed by the transimpedance amplifier to the data recovery unit, enabling normal communication of the data optical signal. Based on this, this application enables real-time monitoring and online breakpoint detection of fiber optic links at a low cost.

[0083] This application also provides an online monitoring system for optical fiber links, including an optical network transmission fiber and an optical module of any of the above embodiments, wherein the optical module is optically connected to the optical network transmission fiber. The optical network transmission fiber is the external optical fiber mentioned in the foregoing embodiments. The optical module receives corresponding data optical signals and detection optical signals from the optical network transmission fiber, thereby realizing conventional optical communication and online breakpoint detection.

[0084] In this embodiment, the online monitoring system for fiber optic links includes all the technical means of the aforementioned optical modules, enabling real-time monitoring and breakpoint detection of fiber optic links at low cost, thus reducing the high labor costs inherent in existing technologies.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An optical module, characterized in that, The optical module includes at least: A photodetector is used to optically connect to an external optical fiber to receive data optical signals and detection optical signals input through the external optical fiber, and to convert the received data optical signals into data electrical signals and the received detection optical signals into detection electrical signals. A transimpedance amplifier, comprising at least an input terminal, a low-speed sampling terminal, and a high-speed sampling terminal, wherein the input terminal is electrically connected to the photodetector to receive the data electrical signal and the detection electrical signal output by the photodetector; and the high-speed sampling terminal is electrically connected to a data recovery unit to output a high-speed electrical signal processed by the transimpedance amplifier to the data recovery unit. The monitoring unit includes a sampling unit and a control and processor. The sampling unit is electrically connected to the low-speed sampling terminal of the transimpedance amplifier to acquire a sampling signal through the low-speed sampling terminal and transmit the sampling signal to the control and processor. The sampling signal includes an AC sampling signal that samples the detection electrical signal, and the control and processor are used to process the AC sampling signal to determine the fault location of the external optical fiber.

2. The optical module according to claim 1, characterized in that, The bandwidth of the low-speed sampling end is greater than 0.75 times the bandwidth of the detection optical signal.

3. The optical module according to claim 1, characterized in that, The sampling unit includes at least a fault sampling subunit; a first end of the fault sampling subunit is electrically connected to the low-speed sampling end; and a second end of the fault sampling subunit is connected to the control and processor. The fault sampling subunit is used to sample the AC sampling signal in the sampling signal to obtain the detection data signal, and the control and processor is used to analyze and process the detection data signal to determine the fault location of the external optical fiber.

4. The optical module according to claim 3, characterized in that, The fault sampling subunit includes an amplifier and a high-speed analog-to-digital converter; The amplifier is electrically connected to the low-speed sampling terminal of the transimpedance amplifier, and is used to amplify the AC sampling signal in the sampling signal and transmit the amplified AC sampling signal to the high-speed analog-to-digital converter. The high-speed analog-to-digital converter is electrically connected to the amplifier and the control and processor respectively, and is used to sample the amplified AC sampling signal to obtain the detection data signal and transmit it to the control and processor.

5. The optical module according to claim 4, characterized in that, The fault sampling subunit also includes a coupling capacitor, which is electrically connected between the low-speed sampling terminal of the transimpedance amplifier and the amplifier; the coupling capacitor is used to isolate the DC signal in the sampling signal.

6. The optical module according to claim 4 or 5, characterized in that, The fault sampling subunit further includes a bandpass filter with a preset frequency band range, the bandpass filter being electrically connected between the amplifier and the high-speed analog-to-digital converter; the bandpass filter is used to filter the amplified AC sampling signal.

7. The optical module according to claim 3, characterized in that, The control and processor includes a breakpoint detection processing unit, which receives the detection data signal and analyzes and processes the detection data signal to determine the fault location of the external optical fiber.

8. The optical module according to claim 3, characterized in that, The sampling unit further includes an intensity sampling subunit, and the control and processor further includes a signal strength monitoring unit; The intensity sampling subunit is electrically connected to the low-speed sampling terminal of the transimpedance amplifier and the signal intensity monitoring unit. The signal intensity monitoring unit obtains the DC sampling signal in the sampling signal through the intensity sampling subunit to monitor the intensity of the data optical signal and / or the detection optical signal.

9. The optical module according to claim 8, characterized in that, The intensity sampling subunit includes a sampling resistor; the first end of the sampling resistor is electrically connected to the low-speed sampling end of the transimpedance amplifier and the signal intensity monitoring unit, and the second end is grounded; The AC sampling signal output from the low-speed sampling terminal is transmitted to the fault sampling subunit, and the DC sampling signal is transmitted to the sampling resistor; the signal strength monitoring unit obtains the DC sampling signal through the sampling resistor.

10. The optical module according to claim 1, characterized in that, The low-speed sampling terminal is the RSSI pin of the transimpedance amplifier.

11. An online monitoring system for fiber optic links, characterized in that, It includes an optical fiber for optical network transmission and an optical module as described in any one of claims 1 to 10, wherein the optical module is optically connected to the optical fiber for optical network transmission.

Images