Patent ID: 11910134
Assignee: GOOGLE LLC
Field: Telecommunications (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 15:
16. A method of detecting signal loss in an optical fiber system, the method comprising:
forming a path comprising a fiber input to a first fiber collimator, an optical circuit switch (OCS) optical path, and a port of a second fiber collimator,
wherein a first photodetector of a link diagnostic system is optically coupled to an optical circulator along the path;

generating, by a light source of at the link diagnostic system, an optical signal;
transmitting the optical signal through at least a portion of the path;
receiving a portion of the optical signal at the optical circulator connected to the port of the second fiber collimator;
receiving at the first photodetector a reflected portion of the optical signal; and
detecting signal loss based on the reflected portion of the optical signal.