High loss loop back for long repeater span

Details High loss loop back for long repeater span High loss loop back for long repeater span

2011-08-30

2011-08-30

Vanderpuye, Ken N (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S010000, C398S011000, C398S013000, C398S016000, C398S017000, C398S018000, C398S020000, C398S025000, C398S030000, C398S031000, C398S032000, C398S033000

Reexamination Certificate

active

08009983

ABSTRACT:
Various high loss loop back (HLLB) repeater architectures are disclosed that enable selectively monitoring (e.g., measuring, analyzing, etc) of Rayleigh signals from both inbound and outbound directions of an optical communication system. In one such embodiment, first and second optical test signal frequencies (or ranges) are used, in conjunction with selective filtering, for monitoring the outbound and inbound paths, respectively. The repeater architectures allow optical time domain reflectometry (OTDR) monitoring techniques to be employed, for example, in particularly long repeater spans, such as those in excess of 90 km in length.

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