Optical fiber connection detection method and related device

A method comprising:

• receiving, by a second network device from a target optical input interface, a modulated optical signal that is from a target optical output interface of a first network device, wherein the target optical input interface is one of at least one optical input interface of the second network device;
• obtaining, by the second network device, first label information from the modulated optical signal, wherein the first label information indicates the target optical output interface;
• and
• obtaining, by the second network device, second label information, wherein the second label information indicates the target optical input interface, and the first label information and the second label information are used to detect an optical fiber connection relationship between the target optical input interface and the target optical output interface.

A first network device, comprising a label loader, a laser, a demultiplexer, and at least one optical output interface that are sequentially coupled, wherein

• the label loader is configured to obtain first label information, wherein the first label information indicates a target optical output interface, and the target optical output interface is one of the at least one optical output interface;
• the laser is configured to generate an optical signal, wherein a wavelength of the optical signal is within a wavelength range corresponding to the target optical output interface, and the laser is further configured to modulate the first label information onto the optical signal, to generate a modulated optical signal;
• and
• the demultiplexer is configured to send the modulated optical signal from the target optical output interface to a target optical input interface of a second network device, to detect an optical fiber connection relationship between the target optical output interface and the target optical input interface.