Branching system with optical add drop multiplexing function

Details Branching system with optical add drop multiplexing function Branching system with optical add drop multiplexing function

1997-11-20

2000-03-14

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359110, H04J 1402, H04B 1008

Patent

active

060380462

ABSTRACT:
A branching system having an optical ADM, where the optical ADM comprises a first optical circulator being connected to a main signal transmission line input, a first FBG having an input which is an output of the first optical circulator, an optical isolator having an input which is an output of the first FBG, a second optical FBG having an input which is an output of the optical isolator and a second optical circulator having an input which is an output of the second FBG. With this structure, the optical amplifier is able to detect whether the branch transmission line is being cut off due to obstructions. Thus, even if a detour route of light being branched off at the optical circulator is generated, for the light is intercepted by the optical isolator, there should be no generation of a loop. Thus, deterioration on the transmission feature of the main transmission line can be prevented.

REFERENCES:
patent: 5717795 (1998-02-01), Sharma et al.
patent: 5926300 (1999-07-01), Miyakawa et al.
patent: 5933258 (1999-08-01), Flanagan et al.

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