Light amplification device, wavelength division system and detection method
By integrating OTDR functions in the optical amplification module, and using the optical amplification module to transmit and receive optical signals, the problem of high cost of OTDR equipment in the wavelength division system is solved, and the integration and cost reduction of optical fiber detection is achieved.
Patent Information
- Application Number
- CN202410071808.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-17
- Publication Date
- 2025-07-18
AI Technical Summary
The use of independent OTDR equipment in wavelength division systems results in high cost and increased deployment complexity.
The functions of OTDR are multiplexed in the optical amplification module, and pulsed optical signals are emitted through the optical amplification module and echo optical signals are received to realize the optical fiber detection function and integrate the receiving end detection device of OTDR.
Reduces cost and deployment complexity, while implementing fiber detection functions, avoiding dependence on independent OTDR devices.
Smart Images
Figure CN120342478A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical communication technologies, and particularly to an optical amplification device, a wavelength division system, and a detection method. Background Art
[0002] An optical fiber itself includes a large number of fusion splices, pigtails, and single boards, and these positions will affect the signal transmission quality during use. Generally, an optical time domain reflectometer (OTDR) can be used to determine the transmission characteristics of each position of the optical fiber, and then improve the quality of the optical fiber. Currently, the OTDR used in a wavelength division system is an independent device, and the pulsed optical signal emitted by the OTDR is combined into the main line through a fiber interface unit (FIU) to detect the quality and faults of the optical fiber.
[0003] Since an independent OTDR device needs to be used in the current wavelength division system, the cost is relatively high. Summary of the Invention
[0004] Embodiments of this application provide an optical amplification device, a wavelength division system, and a detection method, which are used to reduce the deployment cost and the deployment complexity.
[0005] In a first aspect, an embodiment of this application provides an optical amplification device applied to a wavelength division system, including a control module, an optical amplification module, and a signal receiving module; wherein, the optical amplification module supports operating in a first operating mode and a second operating mode; the control module is used to control the optical amplification module to operate in the first operating mode or the second operating mode; the optical amplification module is used to, in the first operating mode, emit a pulsed optical signal to an optical fiber to be detected in the wavelength division system; in the second operating mode, receive a first optical signal transmitted in the wavelength division system, perform amplification processing on the received first optical signal to obtain a second optical signal, and send the second optical signal to the optical fiber; the signal receiving module is used to receive the reflected optical signal of the pulsed optical signal and detect the optical fiber according to the reflected optical signal.
[0006] An optical amplification device proposed in an embodiment of this application can not only implement the function of amplifying the signal of the main optical path, but also implement the function of optical fiber detection, that is, it has the function of an OTDR. Specifically, the optical amplification module supports the characteristics of implementing the optical amplification function and supporting the emission of pulsed optical signals. Therefore, in scenarios where an OTDR and an optical amplifier are required, there is no need to use an independent OTDR device, which can reduce the cost and the deployment complexity.
[0007] In a possible implementation, the control module includes a controller and a driver; the controller is configured to send a first control signal to the driver; the driver is configured to output a first current to the optical amplification module according to the first control signal, so that the optical amplification module operates in a first operating mode.
[0008] In the above implementation, through the cooperation of the controller and the driver, a corresponding current is output to the optical amplification mode, so that the optical amplification module can emit a pulsed optical signal, that is, operate in the first operating mode, to implement the function of optical fiber detection.
[0009] In a possible implementation, the controller is further configured to send a second control signal to the driver; the driver is configured to output a second current to the optical amplification module according to the second control signal, so that the optical amplification module operates in a second operating mode. In the above implementation, through the cooperation of the controller and the driver, a corresponding current is output to the optical amplification mode, so that the optical amplification module realizes the amplification function, that is, operates in the second operating mode.
[0010] In a possible implementation, it further includes: a coupling unit configured to: couple the second optical signal to the optical fiber; or,
[0011] couple the pulsed optical signal to the optical fiber and couple the backscattered optical signal from the optical fiber to the signal receiving module.
[0012] In the above solution, the first end of the coupling unit is connected to the optical amplification module, and the second end is connected to the optical fiber, and is configured to couple the second optical signal to the optical fiber or couple the pulsed optical signal to the optical fiber. The third end of the coupling unit is connected to the signal receiving module, and is configured to couple the backscattered optical signal from the optical fiber to the signal receiving module. In addition, in the above solution, when the optical amplification module is deployed in the wavelength division system, the FIU may no longer be deployed in the wavelength division system, which can reduce costs and improve the integration degree at the same time.
[0013] The optical amplification device according to the above implementation changes the current output by the driver through the controller, so that the optical amplification module emits a pulsed optical signal, that is, the optical amplification module serves as the transmitting end of the OTDR. The output end of the optical amplification module is connected to a coupler, one end of the coupler is connected to the optical fiber, and the other end of the coupler is connected to a signal receiving module, and the signal receiving module serves as the receiving end of the OTDR.
[0014] In a possible implementation, the coupling unit is a coupler or a circulator.
[0015] In a possible implementation, the optical amplification module is coupled to the optical fiber through the Fiber Interface Unit (FIU) in the wavelength division system; the signal receiving module is coupled to the optical fiber through the FIU.
[0016] In the above implementation, there is no need to deploy a coupling unit in the optical amplification module. By multiplexing the FIU and using the FIU to implement the multiplexing of pulsed optical signals and the reception of backward optical signals, the deployment complexity of the optical amplification module can be reduced.
[0017] In a possible implementation, the optical amplification module is a Semiconductor Optical Amplifier (SOA).
[0018] In a second aspect, an embodiment of the present application provides a detection method, which is applied to the optical amplification device according to the first aspect or any implementation of the first aspect. The method includes:
[0019] The optical amplification device amplifies a first optical signal transmitted in the wavelength division system to obtain a second optical signal, and sends the second optical signal to the optical fiber coupled to the optical amplification device in the wavelength division system;
[0020] When it is determined that the optical fiber needs to be detected, the optical amplification device emits a pulsed optical signal to the optical fiber, and receives the backward optical signal reflected by the optical fiber for the pulsed optical signal, and detects the state of the optical fiber according to the backward optical signal.
[0021] In a possible implementation, when the optical amplification device amplifies the first optical signal transmitted in the wavelength division system, the optical amplification device is in a second working mode; the method further includes: when it is determined that the optical fiber needs to be detected, the optical amplification device switches from the second working mode to the first working mode.
[0022] In a possible implementation, the need to detect the optical fiber includes: determining that the optical wave system is open-circuited; or, detecting the quality of the optical fiber.
[0023] In a third aspect, an embodiment of the present application provides a wavelength division system, including the optical amplification device according to the first aspect or any implementation of the first aspect.
[0024] Based on the implementations provided in the above aspects, the present application can be further combined to provide more implementations. Description of the Drawings
[0025] Figure 1 It is a schematic structural diagram of an optical wave system;
[0026] Figure 2 It is a schematic structural diagram of an OTDR;
[0027] Figure 3 is the principle and gain distribution curve of a semiconductor optical amplifier;
[0028] Figure 4 is a Fabry - Perot (F - P) semiconductor optical amplifier;
[0029] Figure 5 is a schematic structural diagram of an optical amplification device provided by an embodiment of the present application;
[0030] Figure 6 is a schematic structural diagram of another optical amplification device provided by an embodiment of the present application;
[0031] Figure 7 is a schematic structural diagram of yet another optical amplification device provided by an embodiment of the present application;
[0032] Figure 8 is a schematic structural diagram of yet another optical amplification device provided by an embodiment of the present application;
[0033] Figure 9 is a schematic structural diagram of yet another optical amplification device provided by an embodiment of the present application;
[0034] Figure 10 is a schematic structural diagram of yet another optical amplification device provided by an embodiment of the present application;
[0035] Figure 11 is a schematic structural diagram of yet another optical amplification device provided by an embodiment of the present application;
[0036] Figure 12 is a schematic structural diagram of a wavelength division system provided by an embodiment of the present application;
[0037] Figure 13 is a schematic structural diagram of a wavelength division system provided by an embodiment of the present application;
[0038] Figure 14 is a schematic flow diagram of a detection method provided by an embodiment of the present application. Detailed implementation manners
[0039] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application.
[0040] It should be noted that in the description of this application, unless otherwise specified, "a plurality of" means two or more than two. In addition, " / " indicates that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B. The "and / or" in this application is only an association relationship describing the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Here, A and B can be singular or plural. Moreover, in order to clearly describe the technical solutions of the embodiments of this application, in the embodiments of this application, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and roles. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and terms such as "first" and "second" do not necessarily limit differences. It should also be noted that unless otherwise specified, the specific descriptions of some technical features in one embodiment can also be applied to explain the corresponding technical features mentioned in other embodiments.
[0041] Optical fiber communication is a communication method that uses light waves as the carrier and optical fibers as the transmission medium.
[0042] An optical fiber is a fiber made of glass or plastic and can be used as an optical conduction tool. Its principle is "total internal reflection of light". If the geometric size of the core of the optical fiber is much larger than the wavelength of the light wave, there will be multiple propagation modes during the propagation of the optical fiber. Such an optical fiber is called a multimode optical fiber. When the geometric size of the core of the optical fiber is of the same order of magnitude as the wavelength of the light wave (such as in the range of 5 - 10 μm), the optical fiber only allows one mode (the fundamental mode) to propagate in it, and the remaining higher-order modes are all cut off. Such an optical fiber is called a single-mode optical fiber.
[0043] The wavelength division multiplexing method is adopted in the wavelength division system. Wavelength division multiplexing refers to combining two or more different wavelengths of light (carrying various information) at the sending end through a multiplexer (also called a combiner (multiplexer)) and coupling them into the same optical fiber for transmission. At the receiving end, the light of various wavelengths is separated by a demultiplexer (also called a wavelength splitter or a demultiplexer (demultiplexer)), and then further processed by an optical receiver to restore the original signal. This technology of simultaneously transmitting two or more different wavelengths of light in the same optical fiber is called wavelength division multiplexing. Through wavelength division multiplexing technology, the transmission capacity of the optical fiber can be improved. In the wavelength division multiplexing networking mode, different access stations carry services by allocating different wavelengths.
[0044] Currently, the quality / fault detection of the optical fiber in the wavelength division system can be achieved by an optical time domain reflectometer (OTDR). See Figure 1As shown in the figure, it is a schematic diagram of the application of OTDR in a wavelength division system. The wavelength division system includes a multiplexer / demultiplexer, an optical amplifier (OA), a fiber interface unit (FIU), and an OTDR. The optical amplifier can also be simply referred to as an optical amplifier. The function of the optical amplifier is to provide optical signal gain to compensate for the transmission attenuation of the optical signal in the path and increase the relay-free transmission distance of the system. The multiplexer / demultiplexer can use an optical add / drop multiplexer (OADM) for add / drop wavelength processing. The OADM in a node is responsible for separating the optical signal of its corresponding wavelength from the received optical signal and performing add / drop wavelength processing after receiving the optical signal. The optical signal other than the optical signal of its corresponding wavelength in the received optical signal is amplified by the optical amplifier and then coupled to the optical fiber through the FIU. Then at the node of the receiving end, after receiving the optical signal through the FIU and amplifying it by the optical amplifier, it reaches the OADM of the receiving end node for add / drop wavelength processing. A node can also be referred to as a site or a network device, etc. Nodes can be applied to the core layer, aggregation layer, or access layer.
[0045] See Figure 1 As shown in the figure, the OTDR injects pulsed optical signals into the main optical path through the FIU and receives the signals reflected back by the optical fiber through the FIU, thereby performing optical fiber detection, such as quality detection and fault detection. See Figure 2 As shown in the figure, it is a schematic structural diagram of a possible OTDR. The transmitting end in the OTDR includes a pulsed light source, a driver, and a modulator. The receiving end can include a circulator and a receiver. For example, the receiver can include a receiver optical sub-assembly (ROSA), a signal processor, and a microcontroller unit (MCU). For example, the signal processor can use a multi-chip model (MCM). The transmitting end emits a laser pulse (including a pulsed light source, a driver, and a modulator). For example, the pulsed light source can use a laser. For example, the receiving end uses a circulator to receive the signal reflected back by the optical fiber and enters the ROSA of the receiving end for optoelectronic signal conversion, and then after signal processing by the signal processor, the MCU is used to identify the fault location, etc. For another example, the length of the optical cable and the distance of attenuation in the optical cable can be measured by measuring the propagation time of the laser pulse in the optical fiber network. For another example, parameters such as insertion loss and attenuation in the optical cable can also be measured by measuring the reflection intensity of the signal in the optical cable and the change in the reflection intensity.
[0046] In the current wavelength division system, using an independent OTDR to perform optical fiber detection results in high costs and increased deployment complexity.
[0047] In the embodiments of the present application, the function of the OTDR is multiplexed in other optical devices, which can reduce the deployment cost and complexity while realizing the OTDR function. The embodiments of the present application provide an optical amplification device, a wavelength division system and a detection method. By multiplexing the function of the OTDR in the optical amplifier, that is, integrating the function of the OTDR through the optical amplifier, the hardware device of the optical amplifier is reused to emit pulses as the emission source of the OTDR. And a receiving end detection function device is added to the optical amplifier, so as to realize the function of the optical amplifier to implement the OTDR.
[0048] Before describing the solution provided by the embodiments of the present application in detail, the working principle of the optical amplifier will be described first. Taking the working principle of a semiconductor optical amplifier (SOA) as an example below. Other optical amplifiers capable of realizing pulse emission are also applicable to the present application.
[0049] The semiconductor optical amplifier amplifies the incident optical signal through stimulated emission, and its mechanism is the same as that of the semiconductor laser. The SOA is a semiconductor laser without feedback. Its core is that when the semiconductor optical amplifier is optically or electrically pumped, population inversion obtains optical gain, as Figure 3 shown in (a). Figure 3 Shown in (a) is a traveling-wave semiconductor optical amplifier. The SOA gain distribution curve g(ν) and the corresponding amplifier gain spectral curve G(ν) are as Figure 3 shown in (b). Figure 3 In which L represents the length of the SOA. Z represents the distance, and Δν g represents the gain bandwidth. Δν A represents the amplifier bandwidth.
[0050] However, the SOA has reflection at the cleavage plane (the reflection coefficient R is about 32%), with a relatively large feedback. When the bias current is lower than the threshold, they are used as semiconductor optical amplifiers, but the multiple reflections at the Fabry-Perot (F-P) cavity interface must be considered, as Figure 4 shown in (a). This kind of semiconductor optical amplifier can be called an F-P amplifier.
[0051] When R = R1 = R2, and considering the optical frequency ν = ν m , using the F-P interference theory, the amplification factor (i.e., gain) G FPA (ν) satisfies the condition shown in the following formula (1). ν m is the cavity resonance frequency. R1 and R2 represent the reflectivities of the cavity cleavage planes. G(v) represents the single-pass gain when the light wave only transmits once.
[0052]
[0053] When the frequency ν of the incident optical signal s is equal to the cavity resonance frequency ν m , the gain GFPA(ν) reaches its peak. When ν s deviates from ν m , GFPA(ν) drops rapidly, as shown in Figure 4 Figure (b). Figure 4 Figure (b) shows the gain spectral curves of the SOA with different reflectivities. It can be seen from Figure 4 that when the reflectivity R of the semiconductor cleavage surface and air is 0.32, the peak value of the F-P amplifier at the resonance frequency is the largest; the smaller the reflectivity, the smaller the gain; when R = 0, the semiconductor laser becomes a semiconductor traveling-wave optical amplifier, and its gain spectral characteristic is a Gaussian curve.
[0054] From the above discussion, it can be seen that increasing the reflectivity R of the F-P resonator providing optical feedback can significantly increase the gain of the SOA. The larger the reflectivity R, the larger the gain at the resonance frequency. However, when R exceeds a certain value, the semiconductor optical amplifier will become a semiconductor laser. When GR = 1, formula (1) will become infinite, and at this time, the SOA generates laser emission, that is, it acts as a semiconductor laser.
[0055] Refer to Figure 5 shown in the figure, which is a schematic structural diagram of an optical amplification device 500 provided by an embodiment of the present application. The optical amplification device 500 includes a control module 510, an optical amplification module 520, and a signal receiving module 530. The optical amplification module 520 supports working in two working modes. For the convenience of distinguishing the two working modes, they are respectively called the first working mode and the second working mode. In the first working mode, the optical amplification module 520 acts as a laser emitter and performs the functions of a laser emitter, capable of emitting pulsed optical signals. In the second working mode, the optical amplification module 520 acts as an optical amplifier and performs the functions of an optical amplifier. The control module 510 controls the optical amplification module to work in the first working mode or the second working mode.
[0056] Regarding the first working mode:
[0057] The control module 510 controls the optical amplification module to operate in the first operating mode. In the first operating mode, the optical amplification module 520 emits pulsed optical signals to the optical fiber to be detected in the wavelength division system; the signal receiving module 530 receives the reflected optical signals of the optical fiber in response to the pulsed optical signals, and detects the optical fiber according to the reflected optical signals. For example, detecting the fault location of the optical fiber. For another example, by measuring the time taken for the pulsed optical signal to propagate in the optical fiber network, the length of the optical cable and the attenuated distance in the optical cable can be measured. For yet another example, the insertion loss, attenuation and other parameters in the optical cable can also be measured by measuring the reflection intensity of the signal in the optical cable and the change in the reflection intensity.
[0058] For the second operating mode:
[0059] The control module 510 controls the optical amplification module to operate in the second operating mode. In the second operating mode, the optical amplification module 520 receives the first optical signal transmitted in the wavelength division system, amplifies the received first optical signal to obtain a second optical signal, and sends the second optical signal to the optical fiber. In the second operating mode, the optical amplification module 520 acts as an optical amplifier in the main optical path.
[0060] In an embodiment of the present application, an optical amplification device is proposed, which can not only achieve the function of amplifying the signal in the main optical path, but also have the function of optical fiber detection, that is, have the function of OTDR. Thus, in scenarios where OTDR and optical amplifier are required, there is no need to use an independent OTDR device, which can reduce costs and deployment complexity.
[0061] The structure of the control module 510 is described in detail as follows.
[0062] See Figure 6 As shown, the control module 510 includes a controller 511 and a driver 512.
[0063] In a possible implementation manner, for the first operating mode:
[0064] The controller 511 sends a first control signal to the driver 512. The driver 512 outputs a first current to the optical amplification module 520 according to the first control signal, so that the optical amplification module 520 operates in the first operating mode. After receiving the first current, the optical amplification module 520 emits pulsed optical signals to the optical fiber to be detected in the wavelength division system; the signal receiving module 530 receives the reflected optical signals of the optical fiber in response to the pulsed optical signals, and detects the optical fiber according to the reflected optical signals.
[0065] In another possible implementation manner, for the second operating mode:
[0066] The controller 511 sends a second control signal to the driver. The driver 512 outputs a second current to the optical amplification module 520 according to the second control signal, so that the optical amplification module 520 operates in the second operating mode. After receiving the second current, the optical amplification module 520 amplifies the first optical signal transmitted by the wavelength division system to obtain a second optical signal, and sends the second optical signal to the optical fiber.
[0067] Optionally, the controller 511 may be one or more integrated circuits such as a microcontroller unit (MCU) and a central processing unit (CPU) for implementing the functions of the above-mentioned controller 511, and specific details are not limited here.
[0068] The structure of the signal receiving module 530 is described in detail as follows.
[0069] See Figure 7 As shown, the signal receiving module 530 may include a detector 531 and a signal processor 532. The detector 531 may be a photodetector for performing photoelectric conversion processing on the received return optical signal. The signal processor 532 may detect the fault location of the optical fiber according to the electrical signal obtained by the photoelectric conversion processing; or measure the propagation time of the pulsed optical signal in the optical fiber network to obtain the optical cable length and the attenuation distance in the optical cable; or measure the reflection intensity of the signal in the optical cable and the change of the reflection intensity to measure parameters such as insertion loss and attenuation in the optical cable.
[0070] The signal processor 532 may be a processor capable of implementing electrical signal processing such as an application specific integrated circuit (ASIC) or a field-programmable gate array (FPGA) chip. The type of device used by the signal processor 532 in the embodiments of the present application is not specifically limited.
[0071] In a possible implementation manner, see Figure 8 As shown, the optical amplification device 500 may further include a coupling unit 540. For example, the coupling unit 540 may be a circulator or a coupler or other devices for realizing signal coupling, and specific details are not limited here. On the one hand, the coupling unit 540 can couple the pulsed optical signal to the optical fiber and couple the return optical signal from the optical fiber to the signal receiving module 530. On the other hand, the coupling unit 540 can couple the second optical signal to the optical fiber.
[0072] In some embodiments, the optical amplification module 530 may be a SOA, or other optical amplifiers that support amplification and emission of pulsed optical signals. SeeFigure 9 As shown in the figure, taking the optical amplification module 530 as an SOA and the coupling unit 540 as a coupler as examples. After the SOA integrates the OTDR function, the principle of performing the OTDR function is as follows: The current emitted by the controller 511 controlling the driver 512 enables the SOA to output a pulsed optical signal. When the pulsed optical signal is injected into the optical fiber through a coupler and propagates along the optical fiber, a small part of the energy of the pulsed optical signal is reflected back from some points on the optical fiber. The reflected signal will be input into the signal receiving module 530 through the coupler, and finally, the information such as the optical fiber length and the break point position is obtained through processing and calculation in the signal receiving module 530, completing the detection function of the OTDR.
[0073] In another possible implementation, in order to implement the signal coupling function, the FIU in the current wavelength division system can be reused, and the coupler (or circulator) in the optical amplification device 500 can be removed, and the FIU is used for multiplexing the pulsed optical signal and receiving the reflected signal. See Figure 10 As shown in the figure, the optical amplification module 520 is coupled to the optical fiber through the fiber interface unit FIU in the wavelength division system; the signal receiving module 530 is coupled to the optical fiber through the FIU. The current emitted by the controller 511 controlling the driver 512 enables the optical amplification module 520 to output a pulsed optical signal. When the pulsed optical signal is injected into the optical fiber through the FIU and propagates along the optical fiber, a small part of the energy of the pulsed optical signal is reflected back from some points on the optical fiber. The reflected signal will be input into the signal receiving module 530 through the FIU, and finally, the information such as the optical fiber length and the break point position is obtained through processing and calculation in the signal receiving module 530, completing the detection function of the OTDR.
[0074] See Figure 11 The figure shows a schematic structural diagram of a possible optical amplification device provided by an embodiment of the present application. Figure 11 In this case, taking the optical amplification module 530 as an SOA as an example. The current emitted by the controller 511 controlling the driver 512 enables the SOA to output a pulsed optical signal. When the pulsed optical signal is injected into the optical fiber through the FIU and propagates along the optical fiber, a small part of the energy of the pulsed optical signal is reflected back from some points on the optical fiber. The reflected signal will be input into the detector 531 through the FIU, and finally, the information such as the optical fiber length and the break point position is obtained through processing and calculation in the signal processor 532, completing the detection function of the OTDR.
[0075] In the embodiment of the present application, the function of the OTDR can be integrated in an optical amplifier (such as an SOA), and the hardware device of the SOA can be reused to emit a pulsed light as the emission source of the OTDR. Then, by adding a receiving end detection device of the OTDR in the SOA module, the function of the OTDR can be realized in the SOA, with low cost and high integration.
[0076] In the embodiments of the present application, the above optical amplification device can be applied to a wavelength division system. The optical amplification device amplifies a first optical signal transmitted in the wavelength division system to obtain a second optical signal, and sends the second optical signal to an optical fiber coupled to the optical amplification device in the wavelength division system. When it is determined that the optical fiber needs to be detected, the optical amplification device emits a pulsed optical signal to the optical fiber, and receives a reflected optical signal reflected by the optical fiber for the pulsed optical signal, and detects the optical fiber according to the reflected optical signal.
[0077] In a possible implementation, refer to Figure 12 The following is a schematic structural diagram of a wavelength division system provided by an embodiment of the present application. Figure 12 In [diagram reference], the optical amplification device takes Figure 9 the structure shown as an example. The wavelength division system further includes a multiplexer / demultiplexer for performing wavelength add / drop operations. Figure 12 In [diagram reference], the first end of the coupler is connected to the optical amplification module, and the second end is connected to the optical fiber, for coupling the second optical signal to the optical fiber or coupling the pulsed optical signal to the optical fiber. The third end of the coupling unit is connected to the signal receiving module, for coupling the reflected optical signal from the optical fiber to the signal receiving module. Additionally, in the above solution, when the optical amplification module is deployed in the wavelength division system, the FIU may not be deployed in the wavelength division system, which can reduce costs and improve integration at the same time.
[0078] In a possible implementation, refer to Figure 13 The following is a schematic structural diagram of a wavelength division system provided by an embodiment of the present application. Figure 13 In [diagram reference], the optical amplification device takes Figure 11 the structure shown as an example. The wavelength division system further includes a multiplexer / demultiplexer for performing wavelength add / drop operations. Figure 13 In [diagram reference], the first end of the FIU is connected to the optical amplification module, and the second end is connected to the optical fiber, for coupling the second optical signal to the optical fiber or coupling the pulsed optical signal to the optical fiber. The third end of the FIU is connected to the signal receiving module, for coupling the reflected optical signal from the optical fiber to the signal receiving module.
[0079] In the embodiments of the present application, the optical multiplexer / demultiplexer can be an OADM, or a reconfigurable optical add-drop multiplexer (ROADM). The fixed optical add-drop multiplexer (FOADM) and the reconfigurable optical add-drop multiplexer (ROADM) reconfigurable OADM can also be referred to as a tunable OADM (T-OADM). The optical multiplexer / demultiplexer can also use other devices for implementing adding / dropping optical waves, and the embodiments of the present application do not limit this.
[0080] Based on the above embodiments, the embodiments of the present application further provide a detection method. As shown in Figure 14 the detection method includes S1401 and S1402.
[0081] S1401, the optical amplification device amplifies the first optical signal transmitted in the wavelength division system to obtain a second optical signal, and sends the second optical signal to the optical fiber coupled to the optical amplification device in the wavelength division system.
[0082] S1402, when it is determined that the optical fiber needs to be detected, the optical amplification device emits a pulsed optical signal to the optical fiber, and receives the reflected optical signal of the pulsed optical signal by the optical fiber, and detects the state of the optical fiber according to the reflected optical signal.
[0083] In a possible implementation manner, when the optical amplification device amplifies the first optical signal transmitted in the wavelength division system, the optical amplification device is in the second working mode; when it is determined that the optical fiber needs to be detected, the optical amplification device switches from the second working mode to the first working mode.
[0084] In a possible implementation manner, the need to detect the optical fiber may include: determining that the optical wave system is open-circuited; or, detecting the quality of the optical fiber.
[0085] It should be noted that the detection method in the present application can be implemented based on Figures 5 - 11 any of the structures of the optical amplification device shown.
[0086] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An optical amplification device, characterized in that, Applied in a wavelength division system, including a control module, an optical amplification module, and a signal receiving module; wherein, the optical amplification module supports operating in a first operating mode to implement the function of optical fiber detection and in a second operating mode to implement the optical amplification function; The control module is used to control the optical amplification module to operate in the first operating mode or the second operating mode; The optical amplification module is used to, in the first operating mode, transmit a pulsed optical signal to the optical fiber to be detected in the wavelength division system; in the second operating mode, receive a first optical signal transmitted in the wavelength division system, perform amplification processing on the received first optical signal to obtain a second optical signal, and send the second optical signal to the optical fiber; The signal receiving module is used to receive the reflected optical signal of the pulsed optical signal and detect the optical fiber according to the reflected optical signal.
2. The device according to claim 1, characterized in that, The control module includes a controller and a driver; The controller is used to send a first control signal to the driver; The driver is used to output a first current to the optical amplification module according to the first control signal so that the optical amplification module operates in the first operating mode.
3. The device according to claim 2, wherein, The controller is further used to send a second control signal to the driver; The driver is used to output a second current to the optical amplification module according to the second control signal so that the optical amplification module operates in the second operating mode.
4. The device according to any one of claims 1 to 3, characterized in that It further includes: A coupling unit, which is used for: Coupling the second optical signal to the optical fiber; or, Coupling the pulsed optical signal to the optical fiber and coupling the reflected optical signal from the optical fiber to the signal receiving module.
5. The device according to claim 4, characterized in that, The coupling unit is a coupler or a circulator.
6. The device according to any one of claims 1 to 3, characterized in that The optical amplification module is coupled to the optical fiber through a fiber interface unit FIU in the wavelength division system; The signal receiving module is coupled to the optical fiber through the FIU.
7. The device according to any one of claims 1-6, characterized in that, The optical amplification module is a semiconductor optical amplifier SOA.
8. A detection method, characterized in that Applied to the optical amplification device according to any one of claims 1-6, the method includes: The optical amplification device performs amplification processing on the first optical signal transmitted in the wavelength division system to obtain a second optical signal, and sends the second optical signal to the optical fiber coupled to the optical amplification device in the wavelength division system; When it is determined that the optical fiber needs to be detected, the optical amplification device emits a pulsed optical signal to the optical fiber, receives the reflected optical signal of the pulsed optical signal from the optical fiber, and detects the state of the optical fiber according to the reflected optical signal.
9. The method according to claim 8, characterized in that, When the optical amplification device performs amplification processing on the first optical signal transmitted in the wavelength division system, the optical amplification device is in the second operating mode; the method further includes: When it is determined that the optical fiber needs to be detected, the optical amplification device switches from the second operating mode to the first operating mode.
10. The method according to claim 8 or 9, characterized in that, Needing to detect the optical fiber includes: Determining that the optical wave system is open-circuited; or, Needing to detect the quality of the optical fiber.
11. A wavelength division system, characterized in that, Including the optical amplification device according to any one of claims 1-7.