Reflective variable light attenuator

Details Reflective variable light attenuator Reflective variable light attenuator

2006-04-04

2006-04-04

Font, Frank G. (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S033000, C385S047000, C359S282000, C359S283000, C359S324000, C359S484010

Reexamination Certificate

active

07024073

ABSTRACT:
A reflection-type variable optical attenuator comprises: a main attenuator unit including a first birefringent crystal plate, a Faraday rotational angle varying unit, and a second birefringent crystal plate arranged in this order; an input port and an output port that are arranged on a side of one end of the main attenuator unit; and a two-point reflection-type optical path varying reflector that is arranged on a side of the other end of the main attenuator unit. Light that comes in from the input port makes a round trip in the main attenuator unit and goes out through the output port.

REFERENCES:
patent: 6018411 (2000-01-01), Fukushima et al.
patent: 6560379 (2003-05-01), Ikeda et al.
patent: 6631238 (2003-10-01), Liu et al.
patent: 04-221922 (1992-12-01), None
patent: 06-160774 (1994-06-01), None
patent: 11-002781 (1999-01-01), None
patent: 2000-249997 (2000-09-01), None
patent: 2000-249997 (2000-09-01), None
International Search Report for PCT/JP02/09705 mailed Oct. 29, 2002; ISA/JPO.

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