Attenuation devices

Details Attenuation devices Attenuation devices

2005-03-01

2005-03-01

Stafira, Michael P. (Department: 2877)

Optical waveguides

Accessories

Attenuator

C385S024000, C385S047000

Reexamination Certificate

active

06862395

ABSTRACT:
In one embodiment of the invention, an optical attenuation device has an input/output6on which a multiplexed optical input stream is received. A multiplexer/de-multiplexer (MUX/DEMUX)2separates the received stream into individual optical signals on individual channels and has an output/return path12from the MUX/DEMUX2for each of the channels. Reflector means4in each output/return path12reflects all or a proportion of the optical signal on the respective channel back along the output/return path12to the MUX/DEMUX2. At the MUX/DEMUX, the optical signals are combined into a multiplexed stream which is output on the input/output6. In an alternative embodiment, the device has first and second MUX/DEMUX2, 20, an output path12from the first MUX/DEMUX2, attenuation means40at the end of each output path12and return paths120from the attenuation means40to the second MUX/DEMUX20. The attenuation means attenuates the optical signals on the respective channels, and the attenuated signals are combined into a multiplexed stream at the second MUX/DEMUX20. Both embodiments achieve attenuation of multiplexed optical streams by attenuating the component optical signals of the stream in parallel.

REFERENCES:
patent: 5335114 (1994-08-01), Suzuki
patent: 5943155 (1999-08-01), Goossen
patent: 5949571 (1999-09-01), Goossen et al.
patent: 6148124 (2000-11-01), Aksyuk et al.
patent: 6556338 (2003-04-01), Han et al.
patent: 6636657 (2003-10-01), Aksyuk et al.

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