Waveguide type variable optical attenuator

Details Waveguide type variable optical attenuator Waveguide type variable optical attenuator

2005-12-27

2005-12-27

Pak, Sung (Department: 2874)

Optical waveguides

Polarization without modulation

C385S014000, C385S049000, C385S140000, C398S152000

Reexamination Certificate

active

06980707

ABSTRACT:
A waveguide type variable optical attenuator has: a substrate; two optical circuits that are in parallel formed on the substrate, each of the optical circuits including two couplers that conduct the branching and coupling of light and are connected to the input port and output port of light and two waveguides through which the two couplers are connected; a polarization maintaining fiber one end of which is connected to the output port of one of the two optical circuits and the other end of which is connected to the input port of the other of the two optical circuits while being twisted 90°; and a heater that is provided around neighboring waveguides of the two optical circuits such that the neighboring waveguides share heat to be generated by the heater.

REFERENCES:
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patent: 6760499 (2004-07-01), Pezeshki et al.
patent: 6870972 (2005-03-01), Miyata et al.
patent: 2003/0039461 (2003-02-01), Chun et al.
patent: 2003/0123777 (2003-07-01), Miyata et al.
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patent: 2004/0240765 (2004-12-01), Wooten et al.
patent: 11-249089 (1999-09-01), None

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