In-service monitoring of a fiberoptic network

摘要

An optical fiber breakage point may be located by coupling to the optical fiber an out-of-band optical test signal modulated at a periodic modulation pattern. A distance to the breakage point may be determined from a difference between modulation patterns of transmitted and received test signals.

主权项

1. A system comprising:
a controller configured to:
determine a magnitude of a returning optical test signal;determine a modulation frequency offset of the returning optical test signal relative to a current value of a periodically swept modulation frequency; anddetect fault information in a fiberoptic link based on a comparison of at least one of:
the determined magnitude of the returning optical test signal and a reference magnitude of an optical test signal redirected by a wavelength-selective reflector; ora comparison between the determined modulation frequency offset of the returning optical test signal to a reference modulation frequency offset of the optical test signal.