Chromatic dispersion and dispersion slope compensating...

Optical: systems and elements – Diffraction – From grating

Reexamination Certificate

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C359S589000, C398S081000, C398S147000

Reexamination Certificate

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11168433

ABSTRACT:
In a chromatic dispersion and dispersion slope compensating apparatus according to the present invention, a WDM light which has been angularly dispersed to a first direction by a VIPA plate, is angularly dispersed to a second direction vertical to the first direction by a diffraction grating, and optical signals of respective wavelengths output from the diffraction grating are reflected by any one of a plurality of three-dimensional mirrors having reflective surfaces of curved shapes different from each other, to be returned to the VIPA plate. Thus, with a simple control mechanism in which the plurality of three-dimensional mirrors are moved to only the second direction, an apparatus capable of variably compensating for the chromatic dispersion and the dispersion slope independent of each other can be provided.

REFERENCES:
patent: 5930045 (1999-07-01), Shirasaki
patent: 6441959 (2002-08-01), Yang et al.
patent: 6646805 (2003-11-01), Mitamura et al.
patent: 6807008 (2004-10-01), Mitamura
patent: 2002/0012179 (2002-01-01), Cao et al.
patent: 2005/0180748 (2005-08-01), Kawahata
patent: 2005/0213215 (2005-09-01), Mitamura et al.
patent: 2006/0198024 (2006-09-01), Yamauchi et al.
patent: 2006/0215286 (2006-09-01), Okada et al.
patent: 1 237 308 (2002-09-01), None
patent: 2000-511655 (2000-09-01), None
patent: 2002-258207 (2002-11-01), None
patent: 2004/084440 (2004-09-01), None
European Search Reportt in corresponding Application No. 05014024.3-2216 mailed Oct. 21, 2005.
U.S. Appl. No. 10/901,219, filed Jul. 29, 2004, Nobuaki Mitamura et al., Fujitsu Limited of Kawasaki, Japan.

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