Method and system for obtaining variable optical attenuation...

Details Method and system for obtaining variable optical attenuation... Method and system for obtaining variable optical attenuation...

2005-02-15

2005-02-15

Palmer, Phan T. H. (Department: 2874)

Optical waveguides

Accessories

Attenuator

C385S014000, C385S024000, C356S464000, C356S477000

Reexamination Certificate

active

06856751

ABSTRACT:
A method and system of operating a variable optical attenuator to provide a required total attenuation in a planar lightwave circuit. The method comprises providing a first Mach-Zehnder interferometer having a first and a second arm carrying signals in an arbitrary polarization state, providing a second Mach-Zehnder interferometer having a third and a fourth arm carrying signals in an arbitrary polarization state, the second Mach-Zehnder interferometer concatenated in tandem with the first Mach-Zehnder interferometer, and cooperatively operating the concatenated first and second Mach-Zehnder interferometers to obtain the required total attenuation and an effectively nil polarization dependent loss.

REFERENCES:
patent: 6035078 (2000-03-01), Dagens et al.
patent: 6463183 (2002-10-01), Mizuno
patent: 20030039461 (2003-02-01), How Kee Chun et al.
patent: 1 279 999 (2001-07-01), None
patent: 2187858 (1987-09-01), None

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