Optical transmission system, optical power detection method and optical transceiver

Abstract

The embodiment of the invention provides an optical transmission system, an optical fiber power detection method and optical transceiver equipment. The optical transmission system comprises N optical transceivers and N VOAs, wherein the N optical transceivers are in one-to-one correspondence with the N VOAs. The optical transceiver transmits a target optical signal through the first port and detects the transmitting optical power of the target optical signal. And the VOA reflects the target optical signal back to the first port of the optical transceiver. And the optical transceiver detects the first echo optical power of the target optical signal reflected by the VOA. It can be seen that the optical transceiver can detect the emission optical power of the target optical signal and can also detect the first echo optical power of the target optical signal. Therefore, the optical transceiver can realize the fiber connection discovery function and determine the quality of the optical fiber without additionally configuring other detection devices. In addition, the insertion loss and the cost of the optical transmission system are reduced, and the integration level and the reliability of the optical transmission system are also improved.

Description

Technical Field

[0001] The present application relates to the field of optical transmission, and in particular to an optical transmission system, an optical fiber power detection method and an optical transceiver. Background Art

[0002] In the application scenario of dense wavelength division multiplexing (DWDM), the combiner / demultiplexer is connected to multiple optical transport units (OTUs) through optical fibers. In the upstream direction, the combiner / demultiplexer is used to combine and output the optical signals sent by multiple OTUs. In the downstream direction, the combiner / demultiplexer is used to split the input multi-wavelength optical signals and transmit the optical signals of different wavelengths to different OTUs.

[0003] Among them, fiber-connected wave discovery is the main function of operation and maintenance in DWDM scenarios. On the one hand, it is necessary to determine which OTUs are currently sending upstream optical signals to the combiner / splitter through detection. On the other hand, it is also necessary to determine the quality of the optical fiber connected to the OTU through detection. At present, one solution to achieve fiber-connected wave discovery is to set a taper detector (TAP-photo detector, TAP-PD) on the optical fiber connected to the combiner / splitter at the transmitting port of each OTU, and to achieve fiber-connected wave discovery by detecting the optical power through the TAP-PD. However, configuring TAP-PD for the transmitting port of each OTU will result in greater insertion loss and higher cost. Summary of the invention

[0004] The embodiments of the present application provide an optical transmission system, an optical fiber power detection method, and an optical transceiver device. The optical transceiver device can realize the fiber connection detection function and determine the quality of the optical fiber without the need to configure other detection devices.

[0005] In a first aspect, an embodiment of the present application provides an optical transmission system. The optical transmission system includes: N optical transceiver devices and N variable optical attenuators (VOAs), where N is an integer greater than 1. Each optical transceiver device includes a first port, and each VOA includes an input port and an output port. The first port of the first optical transceiver device among the N optical transceiver devices is connected to the input port of the first VOA among the N VOAs through an optical fiber. Specifically, the first optical transceiver device is used to transmit a target optical signal through the first port of the first optical transceiver device, and detect the transmitted optical power of the target optical signal. The first VOA is used to reflect the target optical signal received by the input port of the first VOA to the first port of the first optical transceiver device through the input port of the first VOA. The first optical transceiver device is used to receive the target optical signal reflected by the first VOA through the first port of the first optical transceiver device, and detect the first echo optical power. Among them, the first echo optical power is the optical power of the target optical signal reflected by the first VOA received through the first port of the first optical transceiver device.

[0006] In this implementation, the VOA can reflect the target optical signal transmitted by the optical transceiver through the first port back to the first port of the optical transceiver. The optical transceiver itself can detect both the transmitted optical power of the target optical signal and the first echo optical power of the target optical signal. In this way, the optical transceiver can realize the fiber connection detection function and determine the quality of the optical fiber without the need to configure other detection devices. In addition, the insertion loss and cost of the optical transmission system are reduced, and the integration and reliability of the optical transmission system are improved.

[0007] In some possible implementations, the first optical transceiver device is further used to: determine whether the first echo optical power is greater than a first threshold. If the first echo optical power is greater than the first threshold, it is determined that the first port of the first optical transceiver device is normally connected to the optical fiber. If the first echo optical power is less than or equal to the first threshold, a first alarm is output. It should be understood that the present application provides a specific implementation of the first optical transceiver device to realize the fiber connection discovery function, which enhances the practicality of the present solution.

[0008] In some possible implementations, the first optical transceiver device is also used to: first, obtain the optical power difference between the emission optical power of the test optical signal and the second echo optical power. Wherein, the second echo optical power is the optical power of the test optical signal that is fully reflected when the first port of the first optical transceiver device is not connected to the optical fiber. Afterwards, the third echo optical power is determined according to the emission optical power of the target optical signal and the optical power difference. Wherein, the third echo optical power is the optical power of the target optical signal that is fully reflected when the first port of the first optical transceiver device is not connected to the optical fiber. Furthermore, the quality of the optical fiber connected to the first port of the first optical transceiver device is determined according to the first echo optical power and the third echo optical power. It should be understood that the emission optical power of the target optical signal emitted by the first optical transceiver device in the actual working scenario is flexibly adjusted according to actual needs. Then, the first optical transceiver device needs to determine the third echo optical power of the target optical signal when total reflection occurs according to the emission optical power of the target optical signal and the pre-configured optical power difference. Wherein, the smaller the difference between the third echo optical power and the first echo optical power, the better the quality of the optical fiber, and vice versa. Therefore, the quality of the optical fiber can be determined by obtaining the first echo optical power and the third echo optical power, and the implementation method is relatively simple.

[0009] In some possible implementations, the first optical transceiver device is further used to obtain the insertion loss of the first VOA, and determine the quality of the optical fiber connected to the first port of the first optical transceiver device according to the first echo optical power, the third echo optical power, and the insertion loss. It should be understood that the first VOA has a fixed insertion loss, and the comprehensive insertion loss of the first VOA is more conducive to accurately judging the quality of the optical fiber.

[0010] In some possible implementations, the quality index value of the optical fiber connected to the first port of the first optical transceiver device = the third echo optical power - the first echo optical power - the insertion loss. The first optical transceiver device is also used to determine whether the quality index value of the optical fiber connected to the first port of the first optical transceiver device is greater than a second threshold. If the quality index value of the optical fiber connected to the first port of the first optical transceiver device is greater than the second threshold, a second alarm is output. If the quality index value of the optical fiber connected to the first port of the first optical transceiver device is less than or equal to the second threshold, it is determined that the quality of the optical fiber connected to the first port of the first optical transceiver device meets the quality requirements. This implementation provides a specific calculation method for the quality index value of an optical fiber, which is convenient for maintaining the optical fiber based on the quality index value of the optical fiber in practical applications.

[0011] In some possible implementations, the first VOA further includes a driving element and a reflecting element. The reflecting element is used to reflect the target optical signal from the input port of the first VOA. The driving element is used to control the deflection of the reflecting element to adjust the deflection angle of the target optical signal from the input port of the first VOA after being reflected by the reflecting element. This implementation provides a specific implementation method of the VOA, and different working states of the VOA can be achieved by controlling the deflection of the reflecting element, and the actual application effect is good.

[0012] In some possible implementations, the VOA provided in the present application has two working states. The first working state of the VOA is a normal working state. When the deflection angle is a first angle, the first VOA is used to adjust the optical power of the target optical signal, and output the target optical signal after the optical power adjustment through the first output port. The second working state of the VOA is a fiber connection discovery working state. When the deflection angle is a second angle, the first VOA is used to reflect the target optical signal through the input port of the first VOA to the first port of the first optical transceiver device. Therefore, the VOA provided in the present application can achieve both a normal working state and a fiber connection discovery working state, and is applicable to a wider range of scenarios.

[0013] In some possible implementations, the first optical transceiver device further includes a light source, a first photodetector (PD) and a second PD. The first port of the first optical transceiver device is connected to the light source. The light source is used to transmit a target optical signal. The first PD is used to detect the emission optical power of the target optical signal. The second PD is used to detect the first echo optical power. The present application provides a specific implementation of the first optical transceiver device, which enhances the feasibility of the present solution.

[0014] In some possible implementations, the optical transmission system further includes a combiner / splitter. Each optical transceiver device further includes a second port. The combiner / splitter includes N wave ports and N wave ports. The first output port of the first VOA is connected to the first wave port among the N wave ports of the combiner / splitter through an optical fiber. The second port of the first optical transceiver device is connected to the first wave port among the N wave ports of the combiner / splitter through an optical fiber. In other words, the optical transmission system can be specifically applied in a scenario where multiple optical transceivers perform wave addition and wave dropping.

[0015] In a second aspect, an embodiment of the present application provides an optical power detection method. The optical power detection method is applied to an optical transceiver. The optical transceiver includes a first port, which is connected to an input port of a VOA through an optical fiber. The optical power detection method includes: transmitting a target optical signal through the first port, and detecting the transmitted optical power of the target optical signal. Receiving the target optical signal reflected by the VOA through the first port, and detecting the first echo optical power. The first echo optical power is the optical power of the target optical signal reflected by the VOA received through the first port.

[0016] In some possible implementations, after detecting the first optical echo power, the method further includes: determining whether the first optical echo power is greater than a first threshold. If the first optical echo power is greater than the first threshold, determining that the first port is normally connected to the optical fiber. If the first optical echo power is less than or equal to the first threshold, outputting a first alarm.

[0017] In some possible implementations, the method further includes: obtaining an optical power difference between the emission optical power of the test optical signal and the second echo optical power. The second echo optical power is the optical power of the test optical signal that is fully reflected when the first port is not connected to an optical fiber. The third echo optical power is determined based on the emission optical power of the target optical signal and the optical power difference. The third echo optical power is the optical power of the target optical signal that is fully reflected when the first port is not connected to an optical fiber. The quality of the optical fiber connected to the first port is determined based on the first echo optical power and the third echo optical power.

[0018] In some possible implementations, the method further includes: obtaining an insertion loss of the VOA. Determining the quality of the optical fiber connected to the first port according to the first echo optical power and the third echo optical power includes: determining the quality of the optical fiber connected to the first port according to the first echo optical power, the third echo optical power and the insertion loss.

[0019] In some possible implementations, the quality index value of the optical fiber connected to the first port = the third echo optical power - the first echo optical power - the insertion loss. The method also includes: determining whether the quality index value of the optical fiber connected to the first port is greater than a second threshold. If the quality index value of the optical fiber connected to the first port is greater than the second threshold, a second alarm is output. If the quality index value of the optical fiber connected to the first port is less than or equal to the second threshold, it is determined that the quality of the optical fiber connected to the first port meets the quality requirements.

[0020] In a third aspect, an embodiment of the present application provides an optical transceiver device. The optical transceiver device includes: a first port, a transceiver module and a processing module. The first port is connected to the input port of the VOA through an optical fiber. The transceiver module is used to transmit a target optical signal through the first port. The processing module is used to detect the transmitted optical power of the target optical signal. The transceiver module is used to receive the target optical signal reflected by the VOA through the first port. The processing module is used to detect the first echo optical power. Among them, the first echo optical power is the optical power of the target optical signal reflected by the VOA received through the first port.

[0021] In some possible implementations, the processing module is further configured to determine whether the first echo optical power is greater than a first threshold. If the first echo optical power is greater than the first threshold, the processing module is configured to determine that the first port is normally connected to the optical fiber. If the first echo optical power is less than or equal to the first threshold, the processing module is configured to output a first alarm.

[0022] In some possible implementations, the processing module is further used to: obtain the optical power difference between the emission optical power of the test optical signal and the second echo optical power. The second echo optical power is the optical power of the test optical signal that is fully reflected when the first port is not connected to the optical fiber. The third echo optical power is determined based on the emission optical power of the target signal and the optical power difference. The third echo optical power is the optical power of the target optical signal that is fully reflected when the first port is not connected to the optical fiber. The quality of the optical fiber connected to the first port is determined based on the first echo optical power and the third echo optical power.

[0023] In some possible implementations, the processing module is further used to: obtain the insertion loss of the VOA, and determine the quality of the optical fiber connected to the first port according to the first echo optical power, the third echo optical power and the insertion loss.

[0024] In some possible implementations, the quality index value of the optical fiber connected to the first port = the third echo optical power - the first echo optical power - the insertion loss. The processing module is also used to: determine whether the quality index value of the optical fiber connected to the first port is greater than a second threshold. If the quality index value of the optical fiber connected to the first port is greater than the second threshold, a second alarm is output. If the quality index value of the optical fiber connected to the first port is less than or equal to the second threshold, it is determined that the quality of the optical fiber connected to the first port meets the quality requirements.

[0025] In some possible implementations, the transceiver module includes a light source, and the processing module includes a first PD and a second PD. The first port is connected to the light source. The light source is used to transmit a target optical signal. The first PD is used to detect the emission optical power of the target optical signal. The second PD is used to detect the first echo optical power.

[0026] In an embodiment of the present application, the optical transceiver device transmits a target optical signal through a first port and detects the transmitted optical power of the target optical signal. The VOA reflects the target optical signal back to the first port of the optical transceiver device. Furthermore, the optical transceiver device detects the first echo optical power of the target optical signal reflected by the VOA. It can be seen that the optical transceiver device itself can detect both the transmitted optical power of the target optical signal and the first echo optical power of the target optical signal. In this way, the optical transceiver device can realize the fiber connection detection function and determine the quality of the optical fiber without the need to configure other detection devices. In addition, the insertion loss and cost of the optical transmission system are reduced, and the integration and reliability of the optical transmission system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of an optical transmission system in an embodiment of the present application;

[0028] Figure 2 This is a schematic diagram of the first working state of the VOA in the embodiment of the present application;

[0029] Figure 3 This is a schematic diagram of a second working state of the VOA in an embodiment of the present application;

[0030] Figure 4 This is a schematic diagram of the first structure of the optical transceiver device in the embodiment of the present application;

[0031] Figure 5 This is a schematic diagram of a second structure of an optical transceiver device in an embodiment of the present application;

[0032] Figure 6 This is a schematic diagram of the third structure of the optical transceiver device in the embodiment of the present application;

[0033] Figure 7 A schematic diagram of a process of optical power detection method in an embodiment of the present application;

[0034] Figure 8 This is a schematic diagram of the fourth structure of the optical transceiver device in the embodiment of the present application. DETAILED DESCRIPTION

[0035] The embodiments of the present application provide an optical transmission system, an optical fiber power detection method, and an optical transceiver device. The optical transceiver device can realize the fiber connection detection function and determine the quality of the optical fiber without the need to configure other detection devices. Insertion loss and cost are reduced, and the integration and reliability of the optical transmission system are improved. It should be noted that the terms "first" and "second" in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, rather than to limit a specific order or sequence. It should be understood that the above terms can be interchangeable where appropriate, so that the embodiments described in this application can be implemented in an order other than that described in this application.

[0036] Figure 1 FIG. 1 is a schematic diagram of the structure of an optical transmission system in an embodiment of the present application. Figure 1 As shown, the optical transmission system includes N optical transceiver devices and N variable optical attenuators (VOA). Wherein, N is an integer greater than 1. In some possible scenarios, the optical transmission system also includes a combiner and splitter. Each optical transceiver device includes a first port and a second port. Each VOA includes an input port and an output port. The combiner and splitter include N upstream ports and N downstream ports. Wherein, the optical transceiver device sends an upstream optical signal through the first port, and the optical transceiver device receives a downstream optical signal through the second port. The first port is also referred to as a transmitting port, and the second port is also referred to as a receiving port. It should be noted that when the VOA is in a fiber connection discovery working state, the optical transceiver device can also receive an optical signal reflected by the VOA through the first port. It should be understood that the present application does not limit the specific type of the optical transceiver device, for example, the optical transceiver device is an optical transmission unit (OTU), etc. In one possible scenario, the N VOAs are independent of the combiner and splitter. In another possible scenario, the N VOAs are integrated in the combiner and splitter.

[0037] The following takes the optical transceiver device 1 and VOA 1 as an example to introduce the connection relationship of one branch in the optical transmission system. The connection relationships of other branches in the optical transmission system are similar.

[0038] The first port of the optical transceiver device 1 is connected to the input port of VOA 1 through an optical fiber. The output port of VOA 1 is connected to the upstream port 1 of the combiner / demultiplexer through an optical fiber. The downstream port 1 of the combiner / demultiplexer is connected to the second port of the optical transceiver device 1. In the upstream direction, the optical signal sent by the optical transceiver device 1 is transmitted to the upstream port 1 of the combiner / demultiplexer through VOA 1. This process is called upstream. The combiner / demultiplexer receives N upstream optical signals from N optical transceivers, respectively, and combines the N upstream optical signals and outputs them. In the downstream direction, the combiner / demultiplexer demultiplexes the input multi-wavelength optical signal to obtain N downstream optical signals. The combiner / demultiplexer transmits one of the N downstream optical signals to the optical transceiver device 1 through the downstream port 1. This process is called downstream.

[0039] It should be noted that the VOA provided in the present application has two working states. The first working state of the VOA is the normal working state, in which the VOA adjusts the power of the optical signal from the input port to achieve different degrees of attenuation of the optical signal, and the VOA transmits the power-adjusted optical signal to the combiner / splitter through the output port. The second working state of the VOA is the fiber connection discovery working state, in which the VOA reflects the optical signal from the input port back to the corresponding optical transceiver through the input port. The implementation method of the VOA provided in the present application is introduced below.

[0040] Figure 2 Schematic diagram of the first working state of VOA in the embodiment of the present application. Figure 2 As shown, the VOA includes a reflective element 10 and a driving element 20. The reflective element 10 is used to reflect the optical signal from the input port of the VOA. The driving element 20 is used to control the deflection of the reflective element 10 to adjust the deflection angle of the optical signal after being reflected by the reflective element 10. When the deflection angle of the reflective element 10 is a first angle, the optical signal is reflected to the output port of the VOA through the reflective element 10, and the VOA is in a first working state. It should be understood that the present application does not limit the specific value of the first angle, and the VOA can achieve different degrees of attenuation of the optical signal by adjusting the first angle. For example, when the deflection angle of the reflective element 10 is a first angle, all optical signals input from the input port of the VOA are output from the output port of the VOA, that is, the VOA achieves the passage of the optical signal. For another example, when the deflection angle of the reflective element 10 is a first angle, part of the optical signal input from the input port of the VOA is output from the output port of the VOA, that is, the VOA achieves the attenuation of the optical signal. For another example, when the deflection angle of the reflective element 10 is a first angle, all optical signals input from the input port of the VOA are not output from the output port of the VOA, that is, the VOA blocks the optical signals.

[0041] Figure 3 FIG. 2 is a schematic diagram of the second working state of the VOA in the embodiment of the present application. Figure 3 As shown, Figure 2 The difference between the embodiments shown is that the driving element 20 controls the deflection angle of the reflective element 10 to be different. When the deflection angle of the reflective element 10 is the second angle, the optical signal is vertically incident on the reflective element 10. The optical signal is reflected by the reflective element 10 to the input port of the VOA, and the VOA is in the second working state.

[0042] In a possible implementation, the driving element 20 is a microelectromechanical system (MEMS) driving device. The reflective element 10 is fixed to the MEMS driving device through a cantilever beam, and the MEMS driving device drives the reflective element 10 to deflect by electrostatic drive, electromagnetic drive, electrothermal drive or piezoelectric drive. It should be understood that the MEMS driving device is fixed and the MEMS driving device drives the reflective element 10 to deflect around the rotation axis. The response speed of the VOA driven by MEMS can reach the ms level, and the fiber connection efficiency is relatively high.

[0043] In another possible implementation, the driving element 20 is a rotary motor, which is connected to the reflective element 10 via a connecting rod. The portion of the rotary motor connected to the connecting rod can deflect, thereby driving the reflective element 10 to deflect via the connecting rod.

[0044] It should be noted that the present application mainly uses the second working state of VOA to realize the fiber connection discovery function and determine the quality of the optical fiber. The following takes the optical transceiver device 1 as an example to introduce the specific implementation method of realizing the fiber connection discovery function and determining the quality of the optical fiber.

[0045] Specifically, the optical transceiver device 1 transmits the target optical signal through the first port and detects the transmitted optical power of the target optical signal. VOA 1 reflects the target optical signal from the input port back from the input port to the first port of the optical transceiver device 1. The optical transceiver device 1 detects the first echo optical power of the target optical signal reflected from VOA 1. Then, the optical transceiver device 1 determines whether the first echo optical power is greater than the first threshold. If the first echo optical power is greater than the first threshold, the optical transceiver device 1 determines that the first port is connected to the optical fiber normally, and the fiber connection discovery is realized. If the first echo optical power is less than or equal to the first threshold, the optical transceiver device 1 outputs a first alarm, indicating that the fiber connection discovery is abnormal.

[0046] On the basis of realizing the fiber connection discovery function, the optical fiber quality detection can be further realized. Specifically, the optical transceiver device 1 is pre-configured with the optical power difference between the emission optical power of the test optical signal and the second echo optical power. Among them, the test optical signal is different from the target optical signal, and the test optical signal is the optical signal emitted by the optical transceiver device 1 in the test scenario. The test scenario refers to a scenario in which the first port of the optical transceiver device 1 is not connected to the optical fiber and the test optical signal emitted from the first port can be fully reflected. Then, the second echo optical power refers to the optical power detected by the optical transceiver device 1 when the test signal is fully reflected. It should be understood that the emission optical power of the target optical signal emitted by the optical transceiver device 1 in the actual working scenario is flexibly adjusted according to actual needs. Therefore, the optical transceiver device 1 needs to determine the third echo optical power of the target optical signal when total reflection occurs based on the emission optical power of the target optical signal and the pre-configured optical power difference. For example, the optical power difference is k, the emission optical power of the target optical signal is a, and the third echo optical power of the target optical signal when total reflection occurs is b0=ak. Furthermore, the optical transceiver device 1 can determine the quality of the optical fiber connected to the first port according to the first echo optical power b1 and the third echo optical power b0. The smaller the difference b0-b1, the better the quality of the optical fiber, and vice versa.

[0047] In a possible implementation, the optical transceiver device 1 will also pre-calibrate the fixed insertion loss r of VOA 1. The quality index value q of the optical fiber connected to the first port of the optical transceiver device 1 is b0-b1-r. The optical transceiver device 1 can detect the quality of the optical fiber by calculating q. The smaller q is, the better the quality of the optical fiber is, and vice versa. Then, the optical transceiver device 1 determines whether q is greater than a second threshold. If q is greater than the second threshold, the optical transceiver device 1 outputs a second alarm. If q is less than or equal to the second threshold, the optical transceiver device 1 determines that the quality of the optical fiber connected to the first port meets the quality requirements.

[0048] Optionally, the combiner / demultiplexer is also configured with a fixed insertion loss r of VOA 1, and the optical transceiver device 1 sends the detected b0 and b1 to the combiner / demultiplexer. Then, the combiner / demultiplexer calculates q according to r, b0 and b1, and determines whether the quality of the optical fiber connected to the optical transceiver device 1 meets the standard according to q.

[0049] The following takes the optical transceiver device 1 as an example to introduce possible structures of the optical transceiver device.

[0050] Figure 4 Schematic diagram of the first structure of the optical transceiver device in the embodiment of the present application. Figure 4As shown, the optical transceiver device includes a light source 101, a first photodetector (PD) 102, a second PD 103, a first port 104, a second port 105 and a receiver 106. As an example, the first PD 102 and the second PD 103 are both taper detectors (TAP-photo detector, TAP-PD), and the TAP-PD has the functions of both a taper and a PD. A small portion of the optical signal emitted by the light source 101 to the first port 104 is transmitted to the first PD 102. The first PD 102 is used to detect the optical power of the optical signal input to the first PD 102. Since the splitting ratio of the first PD 102 is known, the optical power of the optical signal emitted by the light source 101 can be determined according to the optical power detected by the first PD 102 and the splitting ratio of the first PD 102. The optical signal reflected by the VOA is input into the optical transceiver device from the first port 104, and a small portion of the optical signal reflected by the VOA is transmitted to the second PD 103. The second PD 103 is used to detect the optical power of the optical signal input to the second PD 103. Since the splitting ratio of the second PD 103 is known, the echo optical power of the optical signal reflected by the VOA can be determined according to the optical power detected by the second PD 103 and the splitting ratio of the second PD 103.

[0051] Figure 5 This is a schematic diagram of the second structure of the optical transceiver device in the embodiment of the present application. Figure 4 The optical transceiver device shown, such as Figure 5As shown, the optical transceiver device also includes a 2×2 optical splitter 107. In addition, the first PD 102 and the second PD 103 are both ordinary PDs rather than TAP-PDs. The 2×2 optical splitter 107 includes port a1, port a2, port a3 and port a4. Port a1 is connected to the light source 101, port a2 is connected to the first port 104, port a3 is connected to the first PD 102, and port a4 is connected to the second PD 103. The 2×2 optical splitter 107 is used to split the optical signal emitted by the light source 101, and to split the optical signal reflected from the VOA input from the first port 102. Among them, a small part of the optical signal emitted by the light source 101 is transmitted to the first PD 102, and a small part of the optical signal reflected from the VOA is transmitted to the second PD 103. The first PD 102 is used to detect the optical power of the optical signal input to the first PD 102. The second PD 103 is used to detect the optical power of the optical signal input to the second PD 103. Since the splitting ratio of the 2×2 splitter 107 is known, the optical power of the optical signal emitted by the light source 101 can be determined according to the optical power detected by the first PD 102 and the splitting ratio of the 2×2 splitter 107. Similarly, the optical power detected by the second PD 103 and the splitting ratio of the 2×2 splitter 107 can be determined according to the echo optical power of the optical signal reflected by the VOA.

[0052] Figure 6 This is a schematic diagram of the third structure of the optical transceiver device in the embodiment of the present application. Figure 4 and Figure 5 The optical transceiver device shown, such as Figure 6As shown, the optical transceiver device also includes a 1×2 optical splitter 108 and a 1×2 optical splitter 109. In addition, the first PD 102 and the second PD 103 are both ordinary PDs rather than TAP-PDs. The 1×2 optical splitter 108 includes a port b1, a port b2, and a port b3. The 1×2 optical splitter 109 includes a port c1, a port c2, and a port c3. Port b1 is connected to the light source 101, port b2 is connected to port c1, and port b3 is connected to the first PD 102. Port c2 is connected to the first port 104, and port c3 is connected to the second PD 103. The 1×2 optical splitter 108 is used to split the optical signal emitted by the light source 101. The 1×2 optical splitter 109 is used to split the optical signal input from the first port 102 and reflected back by the VOA. Among them, a small part of the optical signal emitted by the light source 101 is transmitted to the first PD 102, and a small part of the optical signal reflected by the VOA is transmitted to the second PD 103. The first PD 102 is used to detect the optical power of the optical signal input to the first PD 102. The second PD 103 is used to detect the optical power of the optical signal input to the second PD 103. Since the splitting ratio of the 1×2 splitter 108 is known, the optical power of the optical signal emitted by the light source 101 can be determined according to the optical power detected by the first PD 102 and the splitting ratio of the 1×2 splitter 108. Since the splitting ratio of the 1×2 splitter 109 is known, the echo optical power of the optical signal reflected by the VOA can be determined according to the optical power detected by the second PD 103 and the splitting ratio of the 1×2 splitter 109.

[0053] From the above introduction, it can be seen that the optical transceiver transmits the target optical signal through the first port and detects the transmitted optical power of the target optical signal. The VOA reflects the target optical signal back to the first port of the optical transceiver. Furthermore, the optical transceiver detects the first echo optical power of the target optical signal reflected by the VOA. It can be seen that the optical transceiver itself can detect both the transmitted optical power of the target optical signal and the first echo optical power of the target optical signal. In this way, the optical transceiver can realize the fiber connection detection function and determine the quality of the optical fiber without the need to configure other detection devices. In addition, the insertion loss and cost of the optical transmission system are reduced, and the integration and reliability of the optical transmission system are improved.

[0054] The present application also provides an optical power detection method, which is applied to an optical transceiver device. The optical power detection method is introduced below.

[0055] Figure 7 FIG. 1 is a flow chart of an optical power detection method in an embodiment of the present application. Figure 7 As shown, the optical power detection method includes the following steps.

[0056] 701. An optical transceiver device transmits a target optical signal through a first port, and detects the transmitted optical power of the target optical signal.

[0057] 702. The optical transceiver device receives a target optical signal reflected by the VOA through a first port, and detects a first echo optical power of the target optical signal reflected by the VOA.

[0058] 703. The optical transceiver device determines whether the first echo optical power is greater than a first threshold. If the first echo optical power is greater than the first threshold, the optical transceiver device performs step 705. If the first echo optical power is less than or equal to the first threshold, the optical transceiver device performs step 704.

[0059] 704. The optical transceiver device outputs a first alarm.

[0060] The optical transceiver device outputs the first alarm to indicate that an abnormality is found in the fiber connection.

[0061] 705. The optical transceiver equipment determines that the optical fiber connection is normal.

[0062] 706. The optical transceiver device obtains the quality of the optical fiber connected to the first port.

[0063] Specifically, the optical transceiver device is pre-configured with the optical power difference between the emission optical power of the test optical signal and the second echo optical power when the test optical signal is fully reflected. Figure 1 The relevant introduction of the illustrated embodiment is not repeated here. The optical transceiver device determines the third echo optical power of the target optical signal when total reflection occurs according to the emission optical power of the target optical signal and the pre-configured optical power difference. Furthermore, the optical transceiver device can determine the quality of the optical fiber connected to the first port according to the first echo optical power and the third echo optical power.

[0064] 707. The optical transceiver device determines whether the optical fiber quality index value is greater than the second threshold. If the optical fiber quality index value is greater than the second threshold, the optical transceiver device executes step 708. If the optical fiber quality index value is less than or equal to the second threshold, the optical transceiver device executes step 709.

[0065] In a possible implementation, the optical transceiver device may also pre-calibrate the fixed insertion loss r of the VOA. The quality index value q of the optical fiber = the third echo optical power b0 - the first echo optical power b1 - the fixed insertion loss r.

[0066] 708. The optical transceiver device outputs a second alarm.

[0067] The optical transceiver device outputs the first alarm to indicate that the quality of the optical fiber does not meet the standard.

[0068] 709. The optical transceiver equipment determines that the quality of the optical fiber meets the quality requirements.

[0069] Figure 8 FIG. 4 is a schematic diagram of the fourth structure of the optical transceiver device in the embodiment of the present application. Figure 8 As shown, the optical transceiver device includes a transceiver module 30 and a processing module 40. The transceiver module 30 is used to perform Figure 7 The processing module 40 is used to perform the receiving and sending operations of the target optical signal in the embodiment shown. Figure 7 In the embodiment shown, other operations other than the receiving and sending operation of the target optical signal are described. As an example, the receiving and sending module 30 includes the above Figures 4 to 6 The light source 101 and the first port 104 in the described embodiment. Optionally, the transceiver module 30 further includes the second port 105 and the receiver 106 described above. As another example, the processing module 40 includes the first PD 102 and the second PD 103 described above. Optionally, the processing module 40 further includes a 2×2 optical splitter 107. Optionally, the processing module 40 further includes a 1×2 optical splitter 108 and a 1×2 optical splitter 109.

[0070] Finally, it should be noted that the above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical transmission system, It is characterized in that include: N optical transceiver devices and N variable optical attenuators (VOAs), wherein N is an integer greater than 1, each of the optical transceiver devices comprises a first port, each of the VOAs comprises an input port and an output port, and the first port of a first optical transceiver device among the N optical transceiver devices is connected to the input port of a first VOA among the N VOAs through an optical fiber; The first optical transceiver device is used to transmit a target optical signal through a first port of the first optical transceiver device, and detect the transmitted optical power of the target optical signal; The first VOA is used to reflect the target optical signal received by the input port of the first VOA to the first port of the first optical transceiver device through the input port of the first VOA; The first optical transceiver device is used to receive the target optical signal reflected by the first VOA through the first port of the first optical transceiver device, and detect a first echo optical power, where the first echo optical power is the optical power of the target optical signal reflected by the first VOA and received through the first port of the first optical transceiver device.

2. The optical transmission system according to claim 1, It is characterized in that The first optical transceiver device is further used to: determine whether the first echo optical power is greater than a first threshold; If the first echo optical power is greater than the first threshold, it is determined that the first port of the first optical transceiver device is normally connected to the optical fiber; If the first echo optical power is less than or equal to the first threshold, a first alarm is output.

3. The optical transmission system according to claim 1 or 2, It is characterized in that The first optical transceiver device is also used for: Obtaining an optical power difference between an emission optical power of the test optical signal and a second echo optical power, where the second echo optical power is an optical power of the test optical signal that is fully reflected when the first port of the first optical transceiver device is not connected to an optical fiber; determining a third echo optical power according to the emission optical power of the target optical signal and the optical power difference, wherein the third echo optical power is the optical power of the target optical signal that is fully reflected when the first port of the first optical transceiver device is not connected to an optical fiber; The quality of the optical fiber connected to the first port of the first optical transceiver device is determined according to the first echo optical power and the third echo optical power.

4. The optical transmission system according to claim 3, It is characterized in that The first optical transceiver device is further used to obtain the insertion loss of the first VOA, and determine the quality of the optical fiber connected to the first port of the first optical transceiver device according to the first echo optical power, the third echo optical power and the insertion loss.

5. The optical transmission system according to claim 4, It is characterized in that The quality index value of the optical fiber connected to the first port of the first optical transceiver device = the third echo optical power - the first echo optical power - the insertion loss, and the first optical transceiver device is further used to: determine whether the quality index value of the optical fiber connected to the first port of the first optical transceiver device is greater than a second threshold; If the quality index value of the optical fiber connected to the first port of the first optical transceiver device is greater than the second threshold, output a second alarm; If the quality index value of the optical fiber connected to the first port of the first optical transceiver device is less than or equal to the second threshold, it is determined that the quality of the optical fiber connected to the first port of the first optical transceiver device meets the quality requirement.

6. The optical transmission system according to any one of claims 1 to 5, It is characterized in that The first VOA also includes a driving element and a reflecting element; The reflective element is used to reflect the target optical signal from the input port of the first VOA; The driving element is used to control the deflection of the reflecting element to adjust the deflection angle of the target optical signal from the input port of the first VOA after being reflected by the reflecting element.

7. The optical transmission system according to claim 6, It is characterized in that When the deflection angle is a first angle, the first VOA is used to adjust the optical power of the target optical signal, and output the target optical signal after the optical power adjustment through the first output port; When the deflection angle is a second angle, the first VOA is used to reflect the target optical signal to the first port of the first optical transceiver device through the input port of the first VOA.

8. The optical transmission system according to any one of claims 1 to 7, It is characterized in that The first optical transceiver device further comprises a light source, a first photodetector PD and a second PD, and the first port of the first optical transceiver device is connected to the light source; The light source is used to emit the target light signal; The first PD is used to detect the emission optical power of the target optical signal; The second PD is used to detect the first echo optical power.

9. The optical transmission system according to any one of claims 1 to 8, It is characterized in that The optical transmission system also includes a combiner / splitter, and each of the optical transceiver devices also includes a second port. The combiner / splitter includes N upstream ports and N downstream ports. The first output port of the first VOA is connected to the first upstream port among the N upstream ports of the combiner / splitter through an optical fiber, and the second port of the first optical transceiver device is connected to the first downstream port among the N downstream ports of the combiner / splitter through an optical fiber.

10. A method for detecting optical power, It is characterized in that The optical power detection method is applied to an optical transceiver device, wherein the optical transceiver device comprises a first port, and the first port is connected to an input port of a variable optical attenuator VOA through an optical fiber; The optical power detection method comprises: transmitting a target optical signal through the first port; detecting the emission optical power of the target optical signal; receiving the target optical signal reflected by the VOA through the first port; A first echo optical power is detected, where the first echo optical power is the optical power of the target optical signal reflected by the VOA and received through the first port.

11. The method according to claim 10, It is characterized in that After detecting the first echo optical power, the method further includes: Determining whether the first echo optical power is greater than a first threshold; If the first echo optical power is greater than the first threshold, it is determined that the first port is normally connected to the optical fiber; If the first echo optical power is less than or equal to the first threshold, a first alarm is output.

12. The method according to claim 10 or 11, It is characterized in that The method further comprises: Acquire an optical power difference between an emission optical power of the test optical signal and a second echo optical power, where the second echo optical power is an optical power of total reflection of the test optical signal when the first port is not connected to an optical fiber; Determine a third echo optical power according to the emission optical power of the target optical signal and the optical power difference, wherein the third echo optical power is the optical power of the target optical signal that is fully reflected when the first port is not connected to an optical fiber; The quality of the optical fiber connected to the first port is determined according to the first echo optical power and the third echo optical power.

13. The method according to claim 12, It is characterized in that The method further comprises: Obtaining the insertion loss of the VOA; Determining the quality of the optical fiber connected to the first port according to the first echo optical power and the third echo optical power includes: The quality of the optical fiber connected to the first port is determined according to the first echo optical power, the third echo optical power and the insertion loss.

14. The method according to claim 13, It is characterized in that The quality index value of the optical fiber connected to the first port=the third echo optical power-the first echo optical power-the insertion loss, and the method further includes: Determining whether a quality index value of the optical fiber connected to the first port is greater than a second threshold; If the quality index value of the optical fiber connected to the first port is greater than the second threshold, output a second alarm; If the quality index value of the optical fiber connected to the first port is less than or equal to the second threshold, it is determined that the quality of the optical fiber connected to the first port meets the quality requirement.

15. An optical transceiver device, It is characterized in that The optical transceiver device comprises: a first port, a transceiver module and a processing module, wherein the first port is connected to an input port of a variable optical attenuator VOA through an optical fiber; The transceiver module is used to transmit the target optical signal through the first port; The processing module is used to detect the emission optical power of the target optical signal; The transceiver module is used to receive the target optical signal reflected by the VOA through the first port; The processing module is used to detect a first echo optical power, where the first echo optical power is the optical power of the target optical signal reflected by the VOA and received through the first port.

16. The optical transceiver device according to claim 15, It is characterized in that The processing module is also used to determine whether the first echo optical power is greater than a first threshold; If the first echo optical power is greater than the first threshold, the processing module is used to determine that the first port is normally connected to the optical fiber; If the first echo optical power is less than or equal to the first threshold, the processing module is used to output a first alarm.

17. The optical transceiver device according to claim 15 or 16, It is characterized in that The processing module is further used to: obtain an optical power difference between an emission optical power of the test optical signal and a second echo optical power, wherein the second echo optical power is an optical power of the test optical signal that is fully reflected when the first port is not connected to an optical fiber; Determine a third echo optical power according to the emission optical power of the target signal and the optical power difference, wherein the third echo optical power is the optical power of the target optical signal that is fully reflected when the first port is not connected to an optical fiber; The quality of the optical fiber connected to the first port is determined according to the first echo optical power and the third echo optical power.

18. The optical transceiver device according to claim 17, It is characterized in that The processing module is also used for: Obtaining the insertion loss of the VOA; The quality of the optical fiber connected to the first port is determined according to the first echo optical power, the third echo optical power and the insertion loss.

19. The optical transceiver device according to claim 18, It is characterized in that The quality index value of the optical fiber connected to the first port=the third echo optical power-the first echo optical power-the insertion loss, and the processing module is further used for: Determining whether a quality index value of the optical fiber connected to the first port is greater than a second threshold; If the quality index value of the optical fiber connected to the first port is greater than the second threshold, output a second alarm; If the quality index value of the optical fiber connected to the first port is less than or equal to the second threshold, it is determined that the quality of the optical fiber connected to the first port meets the quality requirement.

20. The optical transceiver device according to any one of claims 15 to 19, It is characterized in that The transceiver module includes a light source, the processing module includes a first photodetector PD and a second PD, and the first port is connected to the light source; The light source is used to emit the target light signal; The first PD is used to detect the emission optical power of the target optical signal; The second PD is used to detect the first echo optical power.

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