Detection method and apparatus for optical path, and roadm

Abstract

A detection method and apparatus for an optical path, and an ROADM, which relate to the technical field of optical communications, and are used for detecting an optical path for non-service optical transmission in an ROADM. The method comprises: sending detection information to an ROADM, wherein the detection information is used for instructing the detection, on the basis of a first optical signal in an ASE optical signal, a target optical path between a first-dimensional port of a first WSS and a second-dimensional port of a second WSS, the target optical path is an optical path among a plurality of optical paths between the first-dimensional port and the second-dimensional port other than an optical path where a second optical signal is located, and the first optical signal and the second optical signal are optical signals of different wavebands in the ASE optical signal; acquiring a plurality of optical powers of the first optical signal, wherein the plurality of optical powers are measured by the ROADM at a first detection port of the first WSS and a second detection port of the second WSS on the basis of the detection information; and on the basis of the plurality of optical powers, determining a path loss of the target optical path.

Description

Method and device for detecting optical path and ROADM

[0001] The present application claims priority from the Chinese patent application No. 202410823813.4 filed on June 24, 2024, and entitled "Method and device for detecting optical path and ROADM", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of optical communication technology, and in particular to a method and device for detecting an optical path and a ROADM. BACKGROUND

[0003] A reconfigurable optical add / drop multiplexer (ROADM) is a key node in a wavelength division multiplexing (WDM) transmission system and an optical transport network. The ROADM usually supports wavelength reconfiguration in multiple dimensions, can download a signal of a specific wavelength from a multi-wavelength signal from other dimensions to a local dimension, can upload a signal of any wavelength from the local dimension to other dimensions, and can flexibly configure the wavelength of the signal downloaded by the local dimension in multiple dimensions, so that the network to which the ROADM belongs has the ability of dynamic reconfiguration.

[0004] Currently, when the insertion loss of an optical path in the ROADM is detected, it can only be achieved by detecting a service optical signal transmitted in the optical path, and the optical path without the service optical signal cannot be detected. Therefore, there is an urgent need for a method capable of detecting the optical path without the service optical signal in the ROADM. SUMMARY

[0005] The present application provides a method and device for detecting an optical path and a ROADM, which can be used to detect the optical path without the service optical signal in the ROADM.

[0006] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0007] In a first aspect, a method for detecting an optical path is provided. The method is used for detecting an optical path in a ROADM. The ROADM includes a plurality of WSSs. Each WSS of the plurality of WSSs includes a dimension port, a detection port, and a plurality of upload / download ports. The plurality of upload / download ports of different WSSs of the plurality of WSSs are connected through optical fibers. The plurality of WSSs includes a first WSS and a second WSS. The method includes: sending detection information to the ROADM. The detection information is used to instruct the ROADM to detect a target optical path between a first dimension port of the first WSS and a second dimension port of the second WSS based on a first optical signal in an ASE optical signal received by the first WSS. The target optical path is an optical path between the first dimension port and the second dimension port, except for an optical path in which a second optical signal is located. The first optical signal and the second optical signal are optical signals of different wavebands in the ASE optical signal. For example, the first optical signal can be a noise optical signal, and the second optical signal can be a service optical signal. The method further includes: obtaining a plurality of optical powers of the first optical signal. The plurality of optical powers are detected by the ROADM at a first detection port of the first WSS and a second detection port of the second WSS based on the detection information. The method further includes: determining a path loss of the target optical path based on the plurality of optical powers.

[0008] In the above technical solution, the management device can send detection information to the ROADM. The detection information is used to instruct the ROADM to detect a target optical path between a first dimension port of the first WSS and a second dimension port of the second WSS based on a first optical signal in an ASE optical signal. The target optical path is an optical path between the first dimension port and the second dimension port, except for an optical path in which a second optical signal is located. The first optical signal can be a noise optical signal, and the second optical signal can be a service optical signal. In this way, when the ROADM receives the detection information, the ROADM can use the noise optical signal in the ASE optical signal to detect an optical path in the ROADM without a service optical signal. In addition, no additional device needs to be added, so that the volume and cost of the ROADM are not increased.

[0009] In a possible implementation manner of the first aspect, the target optical path includes an optical path formed by a first dimension port of the first WSS, a first upload / download port of the first WSS, a second upload / download port of the second WSS, and a second dimension port of the second WSS; the sending of the detection information to the ROADM includes: sending first detection information to the ROADM, the first detection information being used to instruct the ROADM to schedule a first optical signal in the ASE optical signal received by the first dimension port to a first detection port; sending second detection information to the ROADM, the second detection information being used to instruct the ROADM to schedule the first optical signal to a second detection port through the first upload / download port and the second upload / download port; and the obtaining of the multiple optical powers of the first optical signal includes: obtaining a first optical power of the first optical signal output by the first detection port when the ROADM schedules the first optical signal to the first detection port; and obtaining a second optical power of the first optical signal output by the second detection port when the ROADM schedules the first optical signal to the second detection port.

[0010] In a possible implementation manner of the first aspect, the method further includes: obtaining a third optical power output by the first detection port when the ROADM does not schedule the first optical signal to the first detection port; and obtaining a fourth optical power output by the second detection port when the ROADM schedules the first optical signal to the second detection port; and correspondingly, the determining of the path loss of the target optical path according to the multiple optical powers includes: determining the path loss of the target optical path according to the first optical power, the second optical power, the third optical power, and the fourth optical power.

[0011] In a possible implementation manner of the first aspect, the first optical signal includes part of the optical signals in the ASE optical signal that belong to an in-band waveband, and the second optical signal includes another part of the optical signals in the ASE optical signal that belong to the in-band waveband.

[0012] In a possible implementation manner of the first aspect, the first optical signal includes an optical signal in the ASE optical signal that belongs to an out-of-band waveband.

[0013] In a possible implementation manner of the first aspect, the first optical signal includes optical signals of multiple wavebands.

[0014] In a possible implementation manner of the first aspect, the ROADM supports a C waveband and / or an L waveband.

[0015] In a second aspect, a method for detecting an optical path is provided. The method is applied to a ROADM, and the ROADM includes a plurality of WSSs connected by optical fibers. The plurality of WSSs includes a first WSS and a second WSS. The method includes receiving detection information, the detection information being used to instruct the ROADM to detect a target optical path between a first dimension port of the first WSS and a second dimension port of the second WSS based on a first optical signal in amplified spontaneous emission (ASE) light signals received by the first WSS. The target optical path is an optical path between the first dimension port and the second dimension port, excluding an optical path in which a second optical signal is located. The first optical signal and the second optical signal are optical signals of different wavelength bands in the ASE light signals. The method further includes detecting a plurality of optical powers of the first optical signal at a first detection port of the first WSS and a second detection port of the second WSS respectively according to the detection information, and outputting the plurality of optical powers. The plurality of optical powers are used to determine a path loss of the target optical path.

[0016] In a possible implementation of the second aspect, the target optical path includes an optical path formed by the first dimension port of the first WSS, a first upload / download port of the first WSS, a second upload / download port of the second WSS, and the second dimension port of the second WSS. The method includes receiving detection information, including receiving first detection information, the first detection information being used to instruct the ROADM to schedule a first optical signal in the ASE light signals received by the first dimension port to the first detection port, and receiving second detection information, the second detection information being used to instruct the ROADM to schedule the first optical signal to the second detection port through the first upload / download port and the second upload / download port. The method further includes detecting a plurality of optical powers of the first optical signal at the first detection port of the first WSS and the second detection port of the second WSS respectively according to the detection information, including scheduling the first optical signal to the first detection port according to the first detection information, and detecting a first optical power of the first optical signal at the first detection port, and scheduling the first optical signal to the second detection port according to the second detection information, and detecting a second optical power of the first optical signal at the second detection port.

[0017] In a possible implementation of the second aspect, the method further includes detecting a third optical power at the first detection port and outputting the third optical power when the first optical signal is not scheduled to the first detection port, and detecting a fourth optical power at the second detection port and outputting the fourth optical power when the first optical signal is not scheduled to the second detection port. The first optical power, the second optical power, the third optical power, and the fourth optical power are used to determine the path loss of the target optical path.

[0018] In a possible implementation of the second aspect, the first optical signal includes part of optical signals of in-band wavelength bands in the ASE light signals, and the second optical signal includes another part of optical signals of in-band wavelength bands in the ASE light signals.

[0019] In a possible implementation manner of the second aspect, the first optical signal includes optical signals in an out-of-band wavelength band in the ASE optical signal.

[0020] In a possible implementation manner of the second aspect, the first optical signal includes optical signals in a plurality of wavelength bands.

[0021] In a possible implementation manner of the second aspect, the ROADM supports a C wavelength band and / or an L wavelength band.

[0022] In a third aspect, a detection apparatus of an optical path is provided, configured to detect an optical path in a ROADM, the ROADM including a plurality of WSSs, each WSS in the plurality of WSSs including a dimension port, a detection port and a plurality of upload / download ports, the plurality of upload / download ports of different WSSs in the plurality of WSSs being connected through optical fibers; the plurality of WSSs including a first WSS and a second WSS; the apparatus including: a sending unit configured to send detection information to the ROADM, the detection information being used to instruct the ROADM to detect a target optical path between a first dimension port of the first WSS and a second dimension port of the second WSS based on a first optical signal in an amplified spontaneous emission, ASE, optical signal received by the first WSS, the target optical path being an optical path between the first dimension port and the second dimension port other than an optical path in which a second optical signal is located, the first optical signal and the second optical signal being optical signals in different wavelength bands in the ASE optical signal; a receiving unit configured to obtain a plurality of optical powers of the first optical signal, the plurality of optical powers being detected by the ROADM at the first detection port of the first WSS and the second detection port of the second WSS based on the detection information; and a processing unit configured to determine a path loss of the target optical path according to the plurality of optical powers.

[0023] In a possible implementation manner of the third aspect, the target optical path includes an optical path formed by a first dimension port of the first WSS, a first upload / download port of the first WSS, a second upload / download port of the second WSS, and a second dimension port of the second WSS; the sending unit is further configured to send first detection information to the ROADM, the first detection information being used to instruct the ROADM to schedule a first optical signal in the ASE optical signal received by the first dimension port to a first detection port; the receiving unit is further configured to acquire a first optical power of the first optical signal output by the first detection port when the ROADM schedules the first optical signal to the first detection port; the sending unit is further configured to send second detection information to the ROADM, the second detection information being used to instruct the ROADM to schedule the first optical signal to a second detection port through the first upload / download port and the second upload / download port; and the receiving unit is further configured to acquire a second optical power of the first optical signal output by the second detection port when the ROADM schedules the first optical signal to the second detection port.

[0024] In a possible implementation manner of the third aspect, the receiving unit is further configured to acquire a third optical power output by the first detection port when the ROADM does not schedule the first optical signal to the first detection port, and acquire a fourth optical power output by the second detection port when the ROADM schedules the first optical signal to the second detection port; and the processing unit is further configured to determine a path loss of the target optical path according to the first optical power, the second optical power, the third optical power, and the fourth optical power.

[0025] In a possible implementation manner of the third aspect, the first optical signal includes part of the optical signals in the ASE optical signal that belong to an in-band waveband, and the second optical signal includes another part of the optical signals in the ASE optical signal that belong to the in-band waveband.

[0026] In a possible implementation manner of the third aspect, the first optical signal includes the optical signal in the ASE optical signal that belongs to an out-of-band waveband.

[0027] In a possible implementation manner of the third aspect, the first optical signal includes optical signals of multiple wavebands.

[0028] In a possible implementation manner of the third aspect, the ROADM supports a C waveband and / or an L waveband.

[0029] In a fourth aspect, a ROADM is provided, which includes a plurality of WSSs connected by optical fibers between different WSSs in the plurality of WSSs, the plurality of WSSs including a first WSS and a second WSS; the ROADM further includes: a receiving unit configured to receive detection information, the detection information being used to indicate that a first optical signal in an amplified spontaneous emission (ASE) optical signal received by the first WSS is used to detect a target optical path between a first dimension port of the first WSS and a second dimension port of the second WSS, the target optical path being an optical path between the first dimension port and the second dimension port except for an optical path in which a second optical signal is located, the first optical signal and the second optical signal being optical signals of different wavelength bands in the ASE optical signal; and a detecting unit configured to detect a plurality of optical powers of the first optical signal at a first detection port of the first WSS and a second detection port of the second WSS respectively according to the detection information and output the plurality of optical powers, the plurality of optical powers being used to determine a path loss of the target optical path.

[0030] In a possible implementation of the fourth aspect, the target optical path includes an optical path formed by the first dimension port of the first WSS, a first upload / download port of the first WSS, a second upload / download port of the second WSS, and the second dimension port of the second WSS; the ROADM further includes a scheduling unit; the receiving unit is further configured to receive first detection information, the first detection information being used to indicate that the first optical signal in the ASE optical signal received by the first dimension port is scheduled to the first detection port; the receiving unit is further configured to receive second detection information, the second detection information being used to indicate that the first optical signal is scheduled to the second detection port through the first upload / download port and the second upload / download port; the scheduling unit is configured to schedule the first optical signal to the first detection port according to the first detection information; the detecting unit is further configured to detect a first optical power of the first optical signal at the first detection port; the scheduling unit is further configured to schedule the first optical signal to the second detection port according to the second detection information; and the detecting unit is further configured to detect a second optical power of the first optical signal at the second detection port.

[0031] In a possible implementation of the fourth aspect, the detecting unit is further configured to detect a third optical power at the first detection port and output the third optical power when the first optical signal is not scheduled to the first detection port; and the detecting unit is further configured to detect a fourth optical power at the second detection port and output the fourth optical power when the first optical signal is not scheduled to the second detection port; wherein the first optical power, the second optical power, the third optical power, and the fourth optical power are used to determine the path loss of the target optical path.

[0032] In a possible implementation of the fourth aspect, the first optical signal includes part of the optical signals of the in-band wavelength band in the ASE optical signal, and the second optical signal includes another part of the optical signals of the in-band wavelength band in the ASE optical signal.

[0033] In a possible implementation form of the fourth aspect, the first optical signal comprises optical signals in the out-of-band wavelength band in the ASE optical signal.

[0034] In a possible implementation form of the fourth aspect, the first optical signal comprises optical signals in a plurality of wavelength bands.

[0035] In a possible implementation form of the fourth aspect, the ROADM supports a C wavelength band, and / or an L wavelength band.

[0036] In a fifth aspect, a device for detecting an optical path is provided, the device comprising a processor and a memory, the memory storing instructions that, when executed by the processor, cause the device to perform the method provided in the first aspect or any possible implementation form of the first aspect.

[0037] In a sixth aspect, an optical network system is provided, the optical network system comprising: a management device and a ROADM; wherein the ROADM is the ROADM provided in the fourth aspect or any possible implementation form of the fourth aspect; and the management device comprises the device for detecting an optical path provided in the third aspect or any possible implementation form of the third aspect, or the fifth aspect.

[0038] In a seventh aspect, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program or instructions, which, when executed, implement the method provided in the first aspect or any possible implementation form of the first aspect.

[0039] In an eighth aspect, a computer program product is provided, the computer program product comprising: a computer program, which can also be referred to as code or instructions; wherein the computer program, when executed, causes a computer to perform the method provided in the first aspect or any possible implementation form of the first aspect.

[0040] It can be understood that the beneficial effects of other aspects in addition to the first aspect and any possible implementation form of the first aspect and the second aspect can be correspondingly referred to the beneficial effects described in the foregoing, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0041] FIG. 1 is a structural schematic diagram of a ROADM provided in an embodiment of the present application;

[0042] FIG. 2 is a schematic diagram of detecting an optical path by adding an additional light source and a light detector provided in an embodiment of the present application;

[0043] FIG. 3 is a structural schematic diagram of an optical network system provided in an embodiment of the present application;

[0044] FIG. 4 is a structural schematic diagram of another ROADM provided by an embodiment of the present application;

[0045] FIG. 5 is a flowchart of a method for detecting an optical path provided by an embodiment of the present application;

[0046] FIG. 6 is a schematic diagram of a first optical signal in an ASE optical signal provided by an embodiment of the present application;

[0047] FIG. 7 is a schematic diagram of scheduling and detecting a first optical signal provided by an embodiment of the present application;

[0048] FIG. 8 is a schematic diagram of another scheduling and detecting a first optical signal provided by an embodiment of the present application;

[0049] FIG. 9 is a schematic diagram of yet another scheduling and detecting a first optical signal provided by an embodiment of the present application;

[0050] FIG. 10 is a structural schematic diagram of a management device provided by an embodiment of the present application;

[0051] FIG. 11 is a structural schematic diagram of another management device provided by an embodiment of the present application;

[0052] FIG. 12 is a structural schematic diagram of yet another ROADM provided by an embodiment of the present application. DETAILED DESCRIPTION

[0053] The making and using of various embodiments are discussed in detail below. It should be appreciated that the specific application provided by the present application can be implemented in a variety of specific environments. The specific embodiments discussed are merely illustrative of specific ways to make and use the application and the present technology, and do not limit the scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art.

[0055] Circuits or other components can be described as or said to be "configured to" perform one or more tasks. In this context, "configured to" is used to mean that the circuit / component includes structure (e.g., circuitry) that performs the task(s) during operation. As such, the circuit / component can be referred to as being configured to perform the task(s) even when the circuit / component is not currently operational (e.g., not on). The circuit / component used in the "configured to" language includes hardware-only circuits / component as well as any combination of hardware and software that performs the task(s).

[0056] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the present application, “at least one” means one or more, and “multiple” means two or more. “And / or” describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character “ / ” generally represents an “or” relationship between the associated objects before and after it. “At least one of the following” or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can represent a, b, c, a and b, a and c, b and c, a, b and c; where a, b and c can be single or multiple.

[0057] The embodiments of the present application use “first” and “second” and the like to distinguish objects with similar names or functions or roles. Those skilled in the art can understand that “first” and “second” and the like do not limit the quantity and execution order. The word “coupling” is used to represent electrical connection, including direct connection through wires or connection terminals or indirect connection through other devices. Therefore, “coupling” should be regarded as a broad electronic communication connection.

[0058] It should be noted that in the present application, the words “exemplary” or “for example” are used to mean serving as an example, instance or illustration. Any embodiment or design solution described as “exemplary” or “for example” in the present application should not be interpreted as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of “exemplary” or “for example” is intended to present the relevant concept in a specific manner.

[0059] Before introducing the embodiments of the present application, first, the related background involved in the present application is introduced and explained.

[0060] A reconfigurable optical add / drop multiplexer (ROADM) is a key node in a wavelength division multiplexing (WDM) transmission system and an optical transport network. The ROADM usually supports multiple dimensions of wavelength reconfiguration, can download a specific wavelength signal from a multi-wavelength signal from other dimensions to a local dimension, can upload any wavelength signal from the local dimension to other dimensions, and can flexibly configure the wavelength of the signal downloaded by the local dimension in multiple dimensions, so that the network to which the ROADM belongs has the ability of dynamic reconfiguration.

[0061] For example, FIG. 1 shows a structural diagram of a ROADM, and the ROADM has four dimensions, including dimension 1 to dimension 4. In the ROADM, two wavelength selective switches (WSSs) are arranged on each of the four dimensions, each WSS includes a dimension port, a detection port, and a plurality of upload / download ports, and the plurality of upload / download ports of the WSSs on different dimensions are connected through optical fibers. In FIG. 1, the WSSs arranged on the four dimensions of the ROADM are respectively denoted as WSS1 to WSS8, the detection port of each WSS is denoted as M, and the optical paths between different dimensions are denoted as arrowed lines (including solid lines and dashed lines).

[0062] Currently, when the insertion loss of the optical path in the ROADM is detected, it can only be realized by detecting the service optical signal transmitted in the optical path, and the optical path without the service optical signal cannot be detected. For example, in the ROADM shown in FIG. 1, the solid lines in the plurality of optical paths represent the optical paths with service optical signal transmission, and the dashed lines represent the optical paths without service optical signal transmission. The above-mentioned optical path detection scheme based on the service optical signal has the following problems: 1, the ROADM cannot complete the insertion loss preset when starting; 2, the insertion loss change cannot be detected; 3, the fiber breakage fault cannot be detected; 4, the fiber misconnection cannot be detected. Therefore, there is an urgent need for a method capable of detecting the optical path without service optical signal in the ROADM.

[0063] In a possible embodiment, a schematic diagram for detecting the optical path without service optical signal in the ROADM by adding an additional light source and a photo detector (PD) is provided. For example, as shown in FIG. 2, taking any two dimensions in the ROADM as an example, one of the two dimensions is provided with a WSS, a light-emitting diode (LD), and an optical amplifier (OA) connected to the WSS, and the other dimension is provided with a WSS, a PD, and an OA connected to the WSS, the LD and the PD are respectively the additional light source and the photo detector added in this scheme. In the detection method corresponding to the optical path without service optical signal, the detection light signal is transmitted by the LD, and the power of the detection light signal is detected by the PD to realize the detection, and the wavelength band corresponding to the detection light signal is located in the out-of-band wavelength band of the ROADM. Although this embodiment can realize the detection of the optical path without service optical signal, it needs to add an additional light source and a photo detector, thereby increasing the volume and cost of the ROADM.

[0064] Based on this, the embodiment of the present application provides a detection method of an optical path. The method can utilize the noise optical signal in the amplified spontaneous emission (ASE) optical signal in the ROADM to realize the detection of the optical path of the non-service optical signal in the ROADM, and does not need to increase additional devices, thereby compared with the embodiment described in FIG. 2, the volume and cost of the ROADM are not increased. The method provided by the embodiment of the present application can be applied to various optical network systems with the ROADM. The optical network system can also be referred to as an optical communication network. The optical network system can include but is not limited to a WDM transmission system, an optical transport network, an optical distribution network, an optical passive network or an optical switching network, etc. The structure of the optical network system is exemplarily described below.

[0065] FIG. 3 is a structure schematic diagram of an optical network system provided by the embodiment of the present application. The optical network system includes a management device 10 and at least one ROADM 20. The management device 10 can be connected with the at least one ROADM 20. The number of the at least one ROADM 20 can be one or more. The management device 10 is used to manage the at least one ROADM 20. For example, the management device 10 can be used to manage the scheduling and configuration of the multi-wavelength signals corresponding to different dimensions of each ROADM in the at least one ROADM 20. The embodiment of the present application does not make specific limitation on this.

[0066] Optionally, when the optical network system includes multiple ROADMs, different ROADMs of the multiple ROADMs can be directly or indirectly connected. FIG. 3 takes the example that the at least one ROADM 20 includes ROADM 1 to ROADM n, and the ROADM 1 to ROADM n are connected in a ring shape. n is an integer greater than 1.

[0067] In a possible embodiment, the structure of the above-mentioned ROADM can be as shown in FIG. 4. The ROADM can include multiple dimensions, which can also be referred to as multiple directions. Two WSSs and two OAs can be correspondingly arranged on each dimension. Each WSS in the ROADM can include a dimension port, a detection port and multiple upload / download ports. The multiple upload / download ports of the WSSs in different dimensions are connected through optical fibers. The dimension port of the same WSS is connected with the corresponding OA. The dimension port and the detection port of the same WSS can also be connected.

[0068] Optionally, the wavelength band corresponding to the optical signals supported by the ROADM can be a C wavelength band, or an L wavelength band, or simultaneously include a C wavelength band and an L wavelength band. The C wavelength band and the L wavelength band can include a plurality of different wavelength bands of optical signals. For example, the plurality of wavelength bands in the C wavelength band can include C1, C2 to C120, and the plurality of wavelength bands in the L wavelength band can include L1, L2 to L120.

[0069] It can be understood that the structure of the optical network system and the structure of the ROADM shown in the above do not constitute a limitation on the optical network system and the ROADM. In actual applications, the optical network system and the ROADM can include more or fewer components than those shown, or combine certain components, or different component arrangements, and the embodiments of the present application do not make specific limitations thereon.

[0070] FIG. 5 is a flowchart of an optical path detection method provided by an embodiment of the present application. The method can be applied to an optical network system to detect an optical path in a ROADM. The ROADM includes a plurality of WSSs, each of the plurality of WSSs includes a dimension port, a detection port and a plurality of upload / download ports, the plurality of upload / download ports of different WSSs in the plurality of WSSs are connected through optical fibers, the plurality of WSSs include a first WSS and a second WSS. As shown in FIG. 5, the method includes S201-S204.

[0071] S201: The management device sends detection information to the ROADM, the detection information being used to instruct the ROADM to detect a target optical path between a first dimension port of the first WSS and a second dimension port of the second WSS based on a first optical signal in an ASE optical signal received by the first WSS, the target optical path being an optical path between the first dimension port and the second dimension port except for an optical path in which a second optical signal is located among a plurality of optical paths between the first dimension port and the second dimension port, the first optical signal and the second optical signal being optical signals of different wavelength bands in the ASE optical signal.

[0072] The first WSS and the second WSS can be WSSs corresponding to two different dimensions of the ROADM, for example, the two dimensions are dimension 1 and dimension 2. The dimension port of the first WSS can be referred to as the first dimension port, and the detection port of the first WSS can be referred to as the first detection port. The dimension port of the second WSS can be referred to as the second dimension port, and the detection port of the second WSS can be referred to as the second detection port.

[0073] In addition, the ASE optical signal received by the first WSS can be an optical signal output by the OA connected to the first dimension port of the first WSS through self-excitation emission. The ASE optical signal can include a plurality of optical signals of different wavebands, the first optical signal and the second optical signal being optical signals of different wavebands in the ASE optical signal. In an example, the first optical signal can be a noise optical signal in the ASE optical signal, and the second optical signal can be a service optical signal in the ASE optical signal.

[0074] Further, there are a plurality of optical paths between the first dimension port and the second dimension port, and the target optical path can be any one of the plurality of optical paths except the optical path in which the second optical signal is located. The optical path in which the second optical signal is located can be an optical path for transmitting a service optical signal, or a path in which a service optical signal exists. That is, the target optical path can be any one of the plurality of optical paths that is not used for transmitting a service optical signal, or an optical path in which no service optical signal exists.

[0075] Optionally, the first optical signal includes part of the optical signals of the in-band waveband in the ASE optical signal, and the second optical signal includes another part of the optical signals of the in-band waveband in the ASE optical signal; and / or, the first optical signal includes the optical signals of the out-of-band waveband in the ASE optical signal. Optionally, the first optical signal includes optical signals of one or more wavebands.

[0076] In an example, when the intersection of the free wavebands of the two dimensions corresponding to the first WSS and the second WSS is not empty, the waveband corresponding to the first optical signal can be the free waveband of the two dimensions, or the waveband corresponding to the first optical signal is the free waveband of the in-band ASE optical signal. For example, as shown in (a) of FIG. 6, taking the C waveband supported by the ROADM as an example, if the waveband corresponding to the currently used service optical signal includes wavebands C1, C1 and C3, i.e., the waveband corresponding to the second optical signal includes wavebands C1, C1 and C3, part or all of the noise optical signals of the other wavebands in the in-band waveband of the ROADM except C1, C1 and C3 can be the first optical signal. For another example, as shown in (b) of FIG. 6, taking the C waveband supported by the ROADM as an example, if the waveband corresponding to the currently used service optical signal includes wavebands C118, C119 and C120, i.e., the waveband corresponding to the second optical signal includes C118, C119 and C120, part or all of the noise optical signals of the other wavebands in the in-band waveband of the ROADM except C118, C119 and C120 can be the first optical signal.

[0077] In another example, when the intersection of the free bands in the two dimensions corresponding to the first WSS and the second WSS is empty, the band corresponding to the first optical signal can be the optical signal in the ASE optical signal that belongs to the out-of-band band, or referred to as the band corresponding to the first optical signal being the out-of-band ASE optical signal. For example, the first optical signal can be the out-of-band ASE optical signal shown in (a) or (b) of FIG. 6, and if the in-band bands of the ROADM include C1 to C120 bands, the band of the out-of-band ASE optical signal can include one or more of C-1, C0, C121, C122, or C123.

[0078] In yet another example, when the intersection of the free bands in the two dimensions corresponding to the first WSS and the second WSS is not empty, the band corresponding to the first optical signal can include the free bands in the two dimensions, and can also include the optical signal in the ASE optical signal that belongs to the out-of-band band. For example, if the in-band bands of the ROADM include C1 to C120 bands, and the band corresponding to the second optical signal includes bands C1, C1, and C3, the band corresponding to the first optical signal can include C119, C120, C121, and C122.

[0079] Optionally, as shown in FIG. 7, the target optical path includes an optical path formed by the first dimension port of the first WSS, the first upload / download port of the first WSS, the second upload / download port of the second WSS, and the second dimension port of the second WSS. The first upload / download port can be one of the multiple upload / download ports of the first WSS, and the second upload / download port can be one of the multiple upload / download ports of the second WSS. In FIG. 7, the first dimension port is denoted as COM1, the second dimension port is denoted as COM2, the first detection port is denoted as MON1, the second detection port is denoted as MON2, the first upload / download port is denoted as A1 / D1, and the second upload / download port is denoted as A2 / D2.

[0080] In a possible embodiment, the management device sends detection information to the ROADM, which can include: the management device sends first detection information to the ROADM, the first detection information being used to instruct the ROADM to schedule the first optical signal in the ASE optical signal received by the first dimension port to the first detection port; and the management device sends second detection information to the ROADM, the second detection information being used to instruct the ROADM to schedule the first optical signal through the first upload / download port and the second upload / download port to the second detection port.

[0081] It can be understood that the management device can send the first detection information and the second detection information to the ROADM by one time of sending, or can send the first detection information and the second detection information to the ROADM by two times of sending, and the embodiments of the present application do not make specific limitation.

[0082] S202: When the ROADM receives the detection information, the ROADM detects the first optical power and the second optical power of the first optical signal according to the detection information at the first detection port of the first WSS and the second detection port of the second WSS respectively and outputs.

[0083] In a possible embodiment, the ROADM receiving the detection information can include the ROADM receiving the first detection information and the second detection information. When the ROADM receives the first detection information, the ROADM can schedule the first optical signal in the ASE optical signal received by the first dimension port of the first WSS to the first detection port of the first WSS through the first WSS, and detect and output the first optical power of the first optical signal at the first detection port of the first WSS. When the ROADM receives the second detection information, the ROADM can schedule the first optical signal to the second detection port of the second WSS through the first WSS and the second WSS, and detect and output the second optical power of the first optical signal at the second detection port of the second WSS.

[0084] Optionally, the ROADM can send the first optical power and the second optical power to the management device by one time of outputting, or can send the first optical power and the second optical power to the management device by two times of outputting, and the embodiments of the present application do not make specific limitation.

[0085] The process of the ROADM scheduling the first optical signal in the ASE optical signal and the process of detecting the first optical power and the second optical power of the first optical signal will be described below by taking FIG. 7 as an example.

[0086] For example, as shown in (a) of FIG. 7, the ROADM schedules the first optical signal in the ASE optical signal received by the first dimension port COM1 of the first WSS to the first detection port MON1 of the first WSS through the first WSS, and detects the first optical power P ASE1 ; as shown in (b) of FIG. 7, the ROADM schedules the first optical signal to the first upload / download port A1 / D1 through the first WSS, and the first optical signal output by the first upload / download port A1 / D1 is transmitted to the second upload / download port A2 / D2 of the second WSS through an optical fiber; then, the ROADM schedules the first optical signal received by the second upload / download port A2 / D2 to the second detection port MON2 through the second WSS, and detects the second optical power PASE2 The third upload / download port A3 / D3 of the first WSS and the fourth upload / download port A4 / D4 of the second WSS are also shown in FIG. 7, and a case where the ROADM schedules the second optical signal in the ASE optical signal received by the first dimension port COM1 to the third upload / download port A3 / D3 of the first WSS is taken as an example for description.

[0087] S203: The management device acquires a plurality of optical powers of the first optical signal.

[0088] In a possible embodiment, the management device acquiring the plurality of optical powers of the first optical signal comprises: the management device receiving a first optical power of the first optical signal, and receiving a second optical power of the first optical signal.

[0089] S204: The management device determines a path loss of the target optical path according to the plurality of optical powers.

[0090] In a possible embodiment, the management device determines the path loss of the target optical path according to the first optical power of the first optical signal and the second optical power of the first optical signal.

[0091] Optionally, the management device determines the path loss of the target optical path according to the first optical power and the second optical power of the first optical signal, comprising: determining the optical power of the first optical signal at the first dimension port according to the first optical power and a first insertion loss, and determining the optical power of the first optical signal at the second dimension port according to the second optical power and a second insertion loss, and determining the path loss of the target optical path according to the optical power of the first optical signal at the first dimension port and the optical power of the first optical signal at the second dimension port. Wherein, the first insertion loss is an insertion loss between the first dimension port and the first detection port, and the second insertion loss is an insertion loss between the second dimension port and the second detection port.

[0092] In a possible example, in combination with the description of FIG. 7, if the first optical power is represented as P ASE1 , the second optical power is represented as P ASE2 , the first insertion loss is represented as IL, the second insertion loss is represented as ΔIL, the optical power of the first optical signal at the first dimension port COM1 is represented as P COM1 , and the optical power of the first optical signal at the second dimension port COM2 is represented as P COM2 , then the path loss Q of the target optical path satisfies the following formula: Q=P COM1 -P COM2 ; P COM1 =P ASE1 +IL, P COM2 =P ASE2 +ΔIL; Q=P ASE1 -P ASE2+IL-ΔIL.

[0093] It can be understood that the first optical power P ASE1 and the second optical power P ASE2 may be considered as the optical powers of the first optical signal at the first detection port and the second detection port respectively in the absence of background noise (such as crosstalk noise) in the ROADM. However, in actual application, there is background noise in the ROADM, such as between the first dimension port and the first detection port, and between the second dimension port and the second detection port. At this time, the optical powers detected by the ROADM at the first detection port and the second detection port respectively are optical powers including background noise. Based on this, the embodiments of the present application can also detect the background noise between the first dimension port and the first detection port, and between the second dimension port and the second detection port, and remove the background noise from the actually detected optical power of the first optical signal, to determine the path loss of the target optical path according to the optical power after removing the background noise.

[0094] In a possible embodiment, for the ROADM, the method can further include: detecting a third optical power at the first detection port and outputting when the ROADM does not schedule the first optical signal to the first detection port; and detecting a fourth optical power at the second detection port and outputting when the ROADM does not schedule the first optical signal to the second detection port. The third optical power can be the detected optical power of the background noise between the first dimension port and the first detection port, and the fourth optical power can be the detected optical power of the background noise between the second dimension port and the second detection port.

[0095] The process of scheduling the first optical signal by the ROADM and the process of detecting the multiple optical powers will be illustrated below by taking FIG. 8 as an example.

[0096] For example, as shown in (a) of FIG. 8, when the ROADM does not schedule the first optical signal to the first detection port MON1, i.e., COM1 and MON1 do not establish cross, the ROADM detects the third optical power P N1 through the first detection port COM1; as shown in (b) of FIG. 8, when the ROADM schedules the first optical signal to the first detection port MON1 through the first WSS, i.e., COM1 and MON1 establish cross, the ROADM detects the first optical power P A1+N1 through the first detection port COM1; as shown in (c) of FIG. 8, when the ROADM does not schedule the first optical signal to the second detection port MON2, i.e., COM1-A1 / D1-A2 / D2-COM2 does not establish cross, the ROADM detects the fourth optical power P N2; as shown in (d) of FIG. 8, when the ROADM schedules the first optical signal to the first upload / download port A1 / D1 through the first WSS, the first optical signal is transmitted to the second upload / download port A2 / D2 through the first upload / download port A1 / D1, and the ROADM schedules the first optical signal received by the second upload / download port A2 / D2 to the second detection port MON2 through the second WSS, i.e., COM1-A1 / D1-A2 / D2-COM2 establishes cross, the ROADM detects the second optical power P A2+N2 .

[0097] In the above possible embodiments, for the management device, the method can further include: the management device receiving a third optical power and a fourth optical power output by the ROADM. Correspondingly, the management device determining the path loss of the target optical path according to the plurality of optical powers can include: determining the path loss of the target optical path according to the first optical power, the second optical power, the third optical power and the fourth optical power.

[0098] Optionally, determining the path loss of the target optical path according to the first optical power, the second optical power, the third optical power and the fourth optical power can include: determining the optical power of the first optical signal at the first dimension port according to the first optical power, the third optical power and a first insertion loss, and determining the optical power of the first optical signal at the second dimension port according to the second optical power, the fourth optical power and a second insertion loss; and determining the path loss of the target optical path according to the optical power of the first optical signal at the first dimension port and the optical power of the first optical signal at the second dimension port. Wherein, the first insertion loss is an insertion loss between the first dimension port and the first detection port, and the second insertion loss is an insertion loss between the second dimension port and the second detection port.

[0099] In one possible example, in combination with the description of FIG. 8 above, if the first optical power is represented as P A1+N1 , the second optical power is represented as P A2+N2 , the third optical power is represented as P N1 , and the fourth optical power is represented as P N2 , the first insertion loss is represented as IL, the second insertion loss is represented as ΔIL, the optical power of the first optical signal at the first dimension port COM1 is represented as P COM1 , and the optical power of the first optical signal at the second dimension port COM2 is represented as P COM2 , then the path loss Q of the target optical path satisfies the following formula: Q=P COM1 -P COM2 ; P COM1 =P ASE1 +IL, P ASE1 =P A1+N1 -P N1; P COM2 = P ASE2 + ΔIL, P ASE2 = P A2+N2 - P N2 ; Q = PASE1 - PASE2 + IL - ΔIL.

[0100] Further, the above-mentioned ROADM can support C band, or support L band, or support both C band and L band. When the ROADM supports C band or supports L band, the structure of the ROADM can be as shown in FIG. 7 or FIG. 8 as mentioned above. When the ROADM supports both C band and L band, the structure of the ROADM can be as shown in FIG. 9.

[0101] Optionally, as shown in FIG. 9, the first WSS can include first dimension ports CIN1 and LIN1, a first detection port MON1, a first upload / download port A1 / D1, the second WSS can include second dimension ports CIN2 and LIN2, a second detection port MON2, a second upload / download port A2 / D2, and the above-mentioned CIN1 and CIN2 are connected with C_OA respectively, and LIN1 and LIN2 are connected with L_OA respectively. Wherein, CIN1 and CIN2 represent the dimension ports corresponding to C band, LIN1 and LIN2 represent the dimension ports corresponding to L band, C_OA represents the OA connected with the dimension ports corresponding to C band, and L_OA represents the OA connected with the dimension ports corresponding to L band.

[0102] For example, if the target optical path includes the optical path formed by the first dimension ports CIN1 and LIN1, the first upload / download port A1 / D1, the second upload / download port, and the second dimension ports CIN2 and LIN2, the process of the ROADM scheduling the first optical signal, and the process of detecting the first optical power and the second optical power of the first optical signal can be as shown in (a) and (b) of FIG. 9.

[0103] In the embodiment, the ROADM can send the detection information to the management device, and the detection information is used to instruct the ROADM to detect the target optical path between the first dimension port of the first WSS and the second dimension port of the second WSS based on the first optical signal in the ASE optical signal received by the first WSS, the target optical path is an optical path between the first dimension port and the second dimension port except for the optical path where the second optical signal is located, the first optical signal can be a noise optical signal, and the second optical signal can be a service optical signal. In this way, when receiving the detection information, the ROADM can use the noise optical signal in the ASE optical signal to detect the optical path without the service optical signal in the ROADM, and no additional device needs to be added, so compared with the embodiment described in FIG. 2, the volume and cost of the ROADM will not be increased.

[0104] In the embodiment, the management device can send detection information to the ROADM, and the detection information is used to instruct the ROADM to detect the target optical path between the first dimension port of the first WSS and the second dimension port of the second WSS based on the first optical signal in the ASE optical signal received by the first WSS, the target optical path is an optical path between the first dimension port and the second dimension port except for the optical path where the second optical signal is located, the first optical signal can be a noise optical signal, and the second optical signal can be a service optical signal. In this way, when receiving the detection information, the ROADM can use the noise optical signal in the ASE optical signal to detect the optical path without the service optical signal in the ROADM, and no additional device needs to be added, so compared with the embodiment described in FIG. 2, the volume and cost of the ROADM will not be increased.

[0105] The above mainly introduces the scheme provided by the embodiment from the perspective of the interaction between the management device and the ROADM. It can be understood that the management device and the ROADM include the hardware structure and / or software module for executing the respective functions in order to realize the above functions. Those skilled in the art should easily realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed in the present text can be realized in the form of hardware or the combination of hardware and computer software. Whether a certain function is realized in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0106] The embodiments of the present application can divide the function modules of the management device and the ROADM according to the above method examples. For example, each function module can be divided according to each function, or two or more functions can be integrated in one module. The integrated module can be realized in the form of hardware or in the form of a software function module. It should be noted that the division of the modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, another division manner can be used. The following will be described by taking the division of each function module according to each function as an example.

[0107] In the case of using an integrated unit, FIG. 10 shows a structural schematic diagram of an optical path detection device involved in the above embodiment. The device can be a management device or a chip applied to the management device. The device includes a sending unit 301, a receiving unit 302, and a processing unit 303. The sending unit 301 can be used to support the device to perform S201 in the above method embodiment. The receiving unit 302 can be used to support the device to perform S203 in the above method embodiment. The processing unit 303 can be used to support the device to perform S204 in the above method embodiment. All related contents of each step involved in the above method embodiment can be referred to the function description of the corresponding function module, which will not be described herein again.

[0108] On the basis of using hardware, the processing unit 303 in the embodiments of the present application can be a processor of the device, the sending unit 301 can be a transmitter of the device, and the receiving unit 302 can be a receiver of the device. The transmitter can be integrated with the receiver to serve as a transceiver. The specific transceiver can also be referred to as a communication interface or an interface circuit.

[0109] As shown in FIG. 11, a structural schematic diagram of another optical path detection device involved in the above embodiment is provided in the embodiments of the present application. The device can be a management device or a chip applied to the management device. The device includes a processor 311, and can further include a memory 312, a transceiver 313, and a bus 314. The processor 311, the memory 312, and the transceiver 313 are connected through the bus 314.

[0110] The processor 311 is used to control and manage the actions of the device. In a possible embodiment, the processor 311 can be used to support the device to perform S201, S203, and S204 in the above method embodiment, and / or other technical processes described herein. The transceiver 313 is used to support the device to communicate, such as supporting the device to communicate with the ROADM.

[0111] In the embodiments of the present application, the processor 311 can be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a micro controller unit (MCU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, transistor logic device, hardware component or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in combination with the disclosure of the present application. The processor can also be a combination of computing functions, such as one or more microprocessor combinations, combinations of digital signal processors and microprocessors, and the like. The above bus 314 can include an address bus, a data bus, a control bus and the like.

[0112] In the case of using integrated units, FIG. 12 shows a structural schematic diagram of an optical path detection device involved in the above embodiments. The device can be a ROADM or a chip applied to a ROADM, and the device includes a receiving unit 401, a detection unit 402 and a scheduling unit 403. The receiving unit 401 can be used to support the device to perform the step of receiving detection information in the above method embodiments; the detection unit 402 can be used to support the device to perform one or more steps of detecting optical power in the above method embodiments; and the scheduling unit 403 can be used to support the device to perform one or more steps of scheduling a first optical signal in the above method embodiments. All related contents of the steps involved in the above method embodiments can be referred to the function description of the corresponding function modules, and the embodiments of the present application will not be repeated here.

[0113] On the basis of using hardware implementation, the receiving unit 401, the detection unit 402 and the scheduling unit 403 in the embodiments of the present application can be integrated in one or more WSSs in the device. For example, the receiving unit 401, the detection unit 402 and the scheduling unit can be integrated in the first WSS and the second WSS in the device, and the detection unit 402 can specifically include a first detection port of the first WSS and a second detection port of the second WSS, and the scheduling unit 403 can include components for scheduling or switching a plurality of upload / download ports in the first WSS and the second WSS.

[0114] Based on this, the embodiment of the present application further provides a detection device of an optical path, which can be a ROADM or a chip applied to a ROADM, and the structure of the device can refer to the structure of the ROADM provided above. In a possible embodiment, the first WSS and the second WSS are configured to: receive detection information, the detection information being used to indicate that a first optical signal in an amplified spontaneous emission (ASE) optical signal received by the first WSS is used to detect a target optical path between a first dimension port and a second dimension port of the second WSS, the target optical path being an optical path between the first dimension port and the second dimension port except for an optical path in which a second optical signal is located, the first optical signal and the second optical signal being optical signals of different wave bands in the ASE optical signal; and according to the detection information, a plurality of optical powers of the first optical signal are detected at a first detection port of the first WSS and a second detection port of the second WSS respectively and output, the plurality of optical powers being used to determine path loss of the target optical path. All related contents of the steps involved in the above method embodiments can be referred to the function description of the corresponding function modules, and the embodiment of the present application will not be repeated here.

[0115] In another embodiment of the present application, an optical network system is provided, which includes a management device and a ROADM; wherein the optical network system can be or include the device provided in FIG. 10 or FIG. 11, and is configured to perform the steps of the optical network system in the method embodiments provided above; the ROADM can be the ROADM provided above, and is configured to perform the steps of the ROADM in the method embodiments provided above.

[0116] It can be understood that all related contents of the steps involved in the above method embodiments can be referred to the embodiments of the detection device of the optical path and the embodiments of the optical network system, and the embodiment of the present application will not be repeated here.

[0117] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other manners. For example, the apparatus embodiments described above are only schematic, for example, the division of the modules or units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another apparatus, or some features can be ignored or not executed.

[0118] The units described as separate components can or can not be physically separate, and the components displayed as units can be one physical unit or multiple physical units, that is, can be located in one place, or can be distributed to multiple different places. According to actual needs, part or all of the units can be selected to achieve the purpose of the embodiment scheme.

[0119] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a readable storage medium, which can include a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various storage medium capable of storing program codes. Based on this understanding, the technical solutions of the embodiments of the present application or the entire or part of the technical solutions that essentially contribute to the prior art can be embodied in the form of a software product.

[0120] In another embodiment of the present application, a readable storage medium is also provided, which stores computer execution instructions, when a device (which can be a single-chip microcomputer, a chip, etc.) or a processor executes the steps of the optical network system in the above method embodiment.

[0121] In another embodiment of the present application, a readable storage medium is also provided, which stores computer execution instructions, when a device (which can be a single-chip microcomputer, a chip, etc.) or a processor executes the steps of the ROADM in the above method embodiment.

[0122] In still another embodiment of the present application, a computer program product is also provided, which includes computer instructions stored in a readable storage medium; at least one processor of a device can read the computer instructions from the readable storage medium, and the at least one processor executes the computer instructions to make the device execute the steps of the optical network system in the above method embodiment.

[0123] In still another embodiment of the present application, a computer program product is also provided, which includes computer instructions stored in a readable storage medium; at least one processor of a device can read the computer instructions from the readable storage medium, and the at least one processor executes the computer instructions to make the device execute the steps of the ROADM in the above method embodiment.

[0124] 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 to this, any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for detecting an optical path, characterized in that, For detecting optical paths in a reconfigurable optical add-drop multiplexer (ROADM), the ROADM includes multiple wavelength selective switches (WSS), each WSS including a dimension port, a detection port, and multiple upload / download ports, the multiple upload / download ports of different WSSs being connected via optical fibers; the multiple WSSs include a first WSS and a second WSS; the method includes: The ROADM sends detection information, which instructs the ROADM to detect the target optical path between the first dimension port of the first WSS and the second dimension port of the second WSS based on the first optical signal in the amplified self-emission ASE optical signal received by the first WSS. The target optical path is an optical path other than the optical path where the second optical signal is located among multiple optical paths between the first dimension port and the second dimension port. The first optical signal and the second optical signal are optical signals of different bands in the ASE optical signal. Multiple optical powers of the first optical signal are obtained, wherein the multiple optical powers are detected by the ROADM at the first detection port of the first WSS and the second detection port of the second WSS based on the detection information; The path loss of the target optical path is determined based on the plurality of optical powers.

2. The method according to claim 1, characterized in that, The target optical path includes the optical path formed by the first dimension port of the first WSS, the first upload / download port of the first WSS, the second upload / download port of the second WSS, and the second dimension port of the second WSS; Sending detection information to the ROADM includes: Send first detection information to the ROADM, the first detection information being used to instruct the ROADM to schedule the first optical signal in the ASE optical signal received by the first dimension port to the first detection port; Send a second detection message to the ROADM, the second detection message being used to instruct the ROADM to schedule the first optical signal to the second detection port through the first upload / download port and the second upload / download port; The acquisition of multiple optical powers of the first optical signal includes: When the ROADM dispatches the first optical signal to the first detection port, the first optical power of the first optical signal output by the first detection port is obtained; When the ROADM dispatches the first optical signal to the second detection port, the second optical power of the first optical signal output by the second detection port is obtained.

3. The method according to claim 2, characterized in that, The method further includes: When the ROADM does not dispatch the first optical signal to the first detection port, the third optical power output by the first detection port is obtained; When the ROADM dispatches the first optical signal to the second detection port, the fourth optical power output by the second detection port is obtained; Determining the path loss of the target optical path based on the plurality of optical powers includes: The path loss of the target optical path is determined based on the first optical power, the second optical power, the third optical power, and the fourth optical power.

4. The method according to any one of claims 1-3, characterized in that, The first optical signal includes a portion of the optical signals belonging to the in-band band of the ASE optical signal, and the second optical signal includes another portion of the optical signals belonging to the in-band band of the ASE optical signal.

5. The method according to any one of claims 1-4, characterized in that, The first optical signal includes the out-of-band optical signal in the ASE optical signal.

6. The method according to any one of claims 1-5, characterized in that, The first optical signal includes optical signals of multiple wavelengths.

7. The method according to any one of claims 1-6, characterized in that, The ROADM supports C-band and / or L-band.

8. A method for detecting an optical path, characterized in that, The method is applied in a reconfigurable optical add-drop multiplexer (ROADM), wherein the ROADM includes multiple wavelength selective switches (WSS), different WSSs are connected by optical fibers, and the multiple WSSs include a first WSS and a second WSS; the method includes: Receive detection information, the detection information being used to instruct the ROADM to detect the target optical path between the first dimensional port and the second dimensional port of the second WSS based on the first optical signal in the amplified self-emission ASE optical signal received by the first WSS. The target optical path is an optical path other than the optical path where the second optical signal is located among multiple optical paths between the first dimensional port and the second dimensional port. The first optical signal and the second optical signal are optical signals of different bands in the ASE optical signal. Based on the detection information, multiple optical powers of the first optical signal are detected at the first detection port of the first WSS and the second detection port of the second WSS, and output. The multiple optical powers are used to determine the path loss of the target optical path.

9. The method according to claim 8, characterized in that, The target optical path includes the optical path formed by the first dimension port of the first WSS, the first upload / download port of the first WSS, the second upload / download port of the second WSS, and the second dimension port of the second WSS; The received detection information includes: Receive first detection information, the first detection information being used to instruct the ROADM to schedule the first optical signal in the ASE optical signal received by the first dimension port to the first detection port; Receive second detection information, the second detection information being used to instruct the ROADM to schedule the first optical signal to the second detection port through the first upload / download port and the second upload / download port; The step of detecting multiple optical powers of the first optical signal at the first detection port of the first WSS and the second detection port of the second WSS based on the detection information includes: Based on the first detection information, the first optical signal is scheduled to the first detection port, and the first optical power of the first optical signal is detected at the first detection port. When the first optical signal is dispatched to the second detection port according to the second detection information, the second optical power of the first optical signal is detected at the second detection port.

10. The method according to claim 9, characterized in that, The method further includes: When the first optical signal is not dispatched to the first detection port, the third optical power is detected at the first detection port and output. When the first optical signal is not dispatched to the second detection port, the fourth optical power is detected at the second detection port and output. The first optical power, the second optical power, the third optical power, and the fourth optical power are used to determine the path loss of the target optical path.

11. The method according to any one of claims 8-10, characterized in that, The first optical signal includes a portion of the optical signals belonging to the in-band band of the ASE optical signal, and the second optical signal includes another portion of the optical signals belonging to the in-band band of the ASE optical signal.

12. The method according to any one of claims 8-11, characterized in that, The first optical signal includes the out-of-band optical signal in the ASE optical signal.

13. The method according to any one of claims 8-12, characterized in that, The first optical signal includes optical signals of multiple wavelengths.

14. The method according to any one of claims 8-13, characterized in that, The ROADM supports C-band and / or L-band.

15. A device for detecting optical paths, characterized in that, For detecting the optical path in a reconfigurable optical add-drop multiplexer (ROADM), the ROADM includes multiple wavelength selective switches (WSS), each WSS including a dimension port, a detection port, and multiple upload / download ports, the multiple upload / download ports of different WSSs being connected via optical fibers; the multiple WSSs include a first WSS and a second WSS; the device includes: A transmitting unit is configured to transmit detection information to the ROADM. The detection information is used to instruct the ROADM to detect a target optical path between a first-dimensional port of the first WSS and a second-dimensional port of the second WSS based on a first optical signal in the amplified self-emitting ASE optical signal received by the first WSS. The target optical path is an optical path other than the optical path where the second optical signal is located among multiple optical paths between the first-dimensional port and the second-dimensional port. The first optical signal and the second optical signal are optical signals of different wavelengths in the ASE optical signal. The receiving unit is configured to acquire multiple optical powers of the first optical signal, wherein the multiple optical powers are detected by the ROADM at the first detection port of the first WSS and the second detection port of the second WSS based on the detection information; A processing unit is used to determine the path loss of the target optical path based on the plurality of optical powers.

16. The apparatus according to claim 15, characterized in that, The target optical path includes the optical path formed by the first dimension port of the first WSS, the first upload / download port of the first WSS, the second upload / download port of the second WSS, and the second dimension port of the second WSS; The transmitting unit is further configured to send first detection information to the ROADM, the first detection information being used to instruct the ROADM to schedule the first optical signal in the ASE optical signal received by the first dimension port to the first detection port; The receiving unit is further configured to acquire the first optical power of the first optical signal output by the first detection port when the ROADM dispatches the first optical signal to the first detection port; The transmitting unit is further configured to send second detection information to the ROADM, the second detection information being used to instruct the ROADM to schedule the first optical signal to the second detection port through the first upload / download port and the second upload / download port; The receiving unit is further configured to acquire the second optical power of the first optical signal output by the second detection port when the ROADM dispatches the first optical signal to the second detection port.

17. The apparatus according to claim 16, characterized in that, The receiving unit is further configured to acquire the third optical power output by the first detection port when the ROADM does not schedule the first optical signal to the first detection port; The receiving unit is further configured to acquire the fourth optical power output by the second detection port when the ROADM dispatches the first optical signal to the second detection port; The processing unit is further configured to determine the path loss of the target optical path based on the first optical power, the second optical power, the third optical power, and the fourth optical power.

18. The apparatus according to any one of claims 15-17, characterized in that, The first optical signal includes a portion of the optical signals belonging to the in-band band of the ASE optical signal, and the second optical signal includes another portion of the optical signals belonging to the in-band band of the ASE optical signal.

19. The apparatus according to any one of claims 15-18, characterized in that, The first optical signal includes the out-of-band optical signal in the ASE optical signal.

20. The apparatus according to any one of claims 15-19, characterized in that, The first optical signal includes optical signals of multiple wavelengths.

21. The apparatus according to any one of claims 15-20, characterized in that, The ROADM supports C-band and / or L-band.

22. A ROADM, characterized in that, The ROADM includes multiple wavelength selective switches (WSS), and different WSSs among the multiple WSSs are connected by optical fibers. The multiple WSSs include a first WSS and a second WSS. The ROADM also includes: A receiving unit is configured to receive detection information, wherein the detection information is configured to indicate the detection of a target optical path between the first dimensional port and the second dimensional port of the second WSS based on a first optical signal in the amplified self-emission ASE optical signal received by the first WSS, wherein the target optical path is an optical path other than the optical path in which the second optical signal is located among multiple optical paths between the first dimensional port and the second dimensional port, and the first optical signal and the second optical signal are optical signals of different bands in the ASE optical signal; The detection unit is used to detect and output multiple optical powers of the first optical signal at the first detection port of the first WSS and the second detection port of the second WSS according to the detection information. The multiple optical powers are used to determine the path loss of the target optical path.

23. The ROADM according to claim 22, characterized in that, The target optical path includes the optical path formed by the first dimension port of the first WSS, the first upload / download port of the first WSS, the second upload / download port of the second WSS, and the second dimension port of the second WSS; the ROADM also includes a scheduling unit. The receiving unit is further configured to receive first detection information, the first detection information being configured to instruct the first optical signal in the ASE optical signal received by the first dimension port to be scheduled to the first detection port; The receiving unit is further configured to receive second detection information, the second detection information being used to instruct the first optical signal to be scheduled to the second detection port through the first upload / download port and the second upload / download port; The detection unit is further configured to schedule the first optical signal to the first detection port based on the first detection information; The scheduling unit is used to detect the first optical power of the first optical signal at the first detection port; The detection unit is further configured to schedule the first optical signal to the second detection port according to the second detection information; The scheduling unit is also used to detect the second optical power of the first optical signal at the second detection port.

24. The ROADM according to claim 23, characterized in that, The detection unit is further configured to detect and output the third optical power at the first detection port when the first optical signal is not scheduled to the first detection port; The detection unit is further configured to detect and output the fourth optical power at the second detection port when the first optical signal is not scheduled to the second detection port; The first optical power, the second optical power, the third optical power, and the fourth optical power are used to determine the path loss of the target optical path.

25. The ROADM according to any one of claims 22-24, characterized in that, The first optical signal includes a portion of the optical signals belonging to the in-band band of the ASE optical signal, and the second optical signal includes another portion of the optical signals belonging to the in-band band of the ASE optical signal.

26. The ROADM according to any one of claims 22-25, characterized in that, The first optical signal includes the out-of-band optical signal in the ASE optical signal.

27. The ROADM according to any one of claims 22-26, characterized in that, The first optical signal includes optical signals of multiple wavelengths.

28. The ROADM according to any one of claims 22-27, characterized in that, The ROADM supports C-band and / or L-band.

29. An optical network system, characterized in that, The optical network system includes: an optical path detection device as claimed in any one of claims 15-21, and a ROADM as claimed in any one of claims 22-28.

Images