Fault locating method for optical network and related device

A fault locating method for an optical network, the method comprising:

• receiving, by a first optical network device, a first optical signal from a second optical network device;
• obtaining, by the first optical network device, a first sample set comprising a plurality of optical powers obtained by the first optical network device sequentially sampling the first optical signal for a plurality of times in a first fault locating time period, wherein at least one optical power included in the first sample set is less than or equal to an optical power threshold;
• receiving, by the first optical network device, a third sample set from the second optical network device, wherein the third sample set comprises a plurality of optical powers obtained by sequentially sampling a third optical signal from the first optical network device for a plurality of times by the second optical network device in a third fault locating time period;
• wherein the first fault locating time period and the third fault locating time period at least partially overlap, or a time interval between the first fault locating time period and the third fault locating time period is less than or equal to a second time threshold;
• and
• determining, by the first optical network device, based on a change trend of the plurality of optical powers included in the first sample set and a change trend of the plurality of optical powers included in the third sample set, that the fault type in the optical network is a fault on an optical cable connected between the first optical network device and the second optical network device or a fault on at least one of a first branch optical path and a second branch optical path, wherein the second optical network device is configured to send the first optical signal to the first optical network device sequentially through the second branch optical path, the optical cable, and the first branch optical path, the second branch optical path is connected between the second optical network device and the optical cable, and the first branch optical path is connected between the first optical network device and the optical cable.

A network management device, comprising:

• a memory including program code;
• and
• at least one processor, connected to the memory and operable, upon execution of the program code, to cause the network management device to:
• obtain a first sample set from a first optical network device, wherein the first sample set comprises a plurality of optical powers obtained by the first optical network device sequentially sampling a first optical signal for a plurality of times in a first fault locating time period, at least one optical power included in the first sample set being less than or equal to an optical power threshold;
• obtain a third sample set from a second optical network device, wherein the third sample set comprises a plurality of optical powers obtained by sequentially sampling a third optical signal from the first optical network device for a plurality of times by the second optical network device in a third fault locating time period, wherein the first fault locating time period and the third fault locating time period at least partially overlap, or a time interval between the first fault locating time period and the third fault locating time period is less than or equal to a second time threshold;
• and
• determine, based on the first sample set and the third sample set, a fault type in an optical network based on a change trend of the plurality of optical powers, wherein the fault type in the optical network is a fault on an optical cable connected between the first optical network device and the second optical network device or a fault on at least one of a first branch optical path and a second branch optical path.