Detection device, communication device, detection method, and communication system

A detection method, comprising:

• detecting a transmission fault on an optical transmission path, wherein
• the optical transmission path comprises a local optical module assembly, a plurality of local wavelength division multiplexing optical link groups, a local multiplexer/demultiplexer, and a plurality of remote wavelength division multiplexing optical link groups, that are sequentially coupled,
• the plurality of local wavelength division multiplexing optical link groups are coupled to a plurality of filtering ends of the local multiplexer/demultiplexer,
• a multiplexing end of the local multiplexer/demultiplexer is coupled to the plurality of remote wavelength division multiplexing optical link groups,
• the local optical module assembly integrates an optical time-domain reflectometer (OTDR) detection function, and
• a detection accuracy of the OTDR detection function is greater than a filtering accuracy of the local multiplexer/demultiplexer;
• and
• in response to first alarm information, obtaining different fault indication signals based on whether the local optical module assembly detects a filtering leakage optical signal from the plurality of local wavelength division multiplexing optical link groups based on the OTDR detection function, wherein
• the first alarm information indicates that a first local wavelength division multiplexing optical link group in the plurality of local wavelength division multiplexing optical link groups is incapable of exchanging a service optical signal, and
• the fault indication signal indicates that the transmission fault occurs on the first local wavelength division multiplexing optical link group or the transmission fault occurs on a first remote wavelength division multiplexing optical link group corresponding to the first local wavelength division multiplexing optical link group.

A communication system, comprising:

• a detection device comprising a processor;
• and
• an optical transmission path, comprising a local optical module assembly, a plurality of local wavelength division multiplexing optical link groups, a local multiplexer/demultiplexer, a plurality of remote wavelength division multiplexing optical link groups, and a remote optical module assembly that are sequentially coupled, wherein
• the plurality of local wavelength division multiplexing optical link groups are coupled to a plurality of filtering ends of the local multiplexer/demultiplexer,
• a multiplexing end of the local multiplexer/demultiplexer is coupled to the plurality of remote wavelength division multiplexing optical link groups,
• the local optical module assembly integrates an optical time-domain reflectometer (OTDR) detection function,
• a detection accuracy of the OTDR detection function is greater than a filtering accuracy of the local multiplexer/demultiplexer, and the detection device is configured to:
• exchange a service optical signal with a remote communication device by way of the optical transmission path;
• and
• in response to local alarm information, output different fault indication signals based on whether the local optical module assembly detects a filtering leakage optical signal from the plurality of local wavelength division multiplexing optical link groups based on the OTDR detection function, wherein
• the local alarm information indicates that a first local wavelength division multiplexing optical link group in the plurality of local wavelength division multiplexing optical link groups is incapable of exchanging the service optical signal, and
• the fault indication signal indicates that a transmission fault occurs on the first local wavelength division multiplexing optical link group or a transmission fault occurs on a first remote wavelength division multiplexing optical link group corresponding to the first local wavelength division multiplexing optical link group.