Multipath interference detection method and apparatus, and optical module and communication device

A multipath interference detection apparatus, applied to a first optical module, the multipath interference detection apparatus comprising:

• a receiver, configured to receive a first signal;
• and
• a detector, configured to detect a frequency in the first signal;
• wherein it is determined that multipath interference is not detected, when only a first frequency corresponding to first information is detected from the first signal;
• and/or it is determined that the multipath interference is detected, when at least a second frequency corresponding to second information is detected from the first signal;
• wherein the first information is service information sent by a second optical module, and the second information is service information sent by the first optical module.

An optical module comprising a multipath interference detection apparatus, the multipath interference detection apparatus comprising:

• a receiver, configured to receive a first signal;
• and
• a detector, configured to detect a frequency in the first signal;
• wherein it is determined that multipath interference is not detected, when only a first frequency corresponding to first information is detected from the first signal;
• and/or it is determined that the multipath interference is detected, when at least a second frequency corresponding to second information is detected from the first signal;
• wherein the first information is service information sent by a second optical device, and the second information is service information sent by the optical module.