Liquid crystal cells – elements and systems – Liquid crystal optical element – Liquid crystal diffraction element
Reexamination Certificate
2007-01-23
2007-01-23
Dudek, James A. (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal optical element
Liquid crystal diffraction element
C349S018000, C349S198000, C359S478000
Reexamination Certificate
active
10497239
ABSTRACT:
A liquid crystal variable wavelength filter unit and its driving method applicable for a Wavelength Division Multiplexing (WDM) communication system and an optical network using an optical fiber. The liquid crystal variable wavelength filter unit (130) includes a band pass filter (111) configured of a dielectric multi-layered film inclined by a predetermined angle of α between a first liquid crystal beam deflector (101) and a second liquid crystal beam deflector (103) and held between a first wedge prism (121) and a second wedge prism (123). The first drive device (141) is connected to the first liquid crystal beam deflector (101), and the second drive device (143) is connected to the second liquid crystal beam deflector (103). The wavelength is selected by the liquid crystal beam deflector by making the outgoing angle variable with respect to the band pass filter.
REFERENCES:
patent: 4729641 (1988-03-01), Matsuoka et al.
patent: 5126869 (1992-06-01), Lipchak et al.
patent: 5253033 (1993-10-01), Lipchak et al.
patent: 6104446 (2000-08-01), Blankenbecler et al.
patent: 6481861 (2002-11-01), Cao et al.
patent: 6522467 (2003-02-01), Li et al.
patent: 6529326 (2003-03-01), Cai
patent: 6587180 (2003-07-01), Wang et al.
patent: 6992809 (2006-01-01), Wang et al.
patent: 7009680 (2006-03-01), Cavanaugh et al.
patent: 7057799 (2006-06-01), Chu
patent: 2002/0003601 (2002-01-01), Wang et al.
patent: 2002/0159153 (2002-10-01), Nishimura et al.
patent: 2003/0133651 (2003-07-01), Hakimi et al.
patent: 2003/0142378 (2003-07-01), Mears et al.
patent: 2004/0010196 (2004-01-01), Wang et al.
patent: 2004/0218253 (2004-11-01), Chu
patent: 5-80358 (1993-04-01), None
patent: 6-51113 (1994-02-01), None
patent: 6-130339 (1994-05-01), None
patent: 9-90247 (1997-04-01), None
Ide Masafumi
Klaus Werner
Citizen Watch Co. Ltd.
Dudek James A.
Westerman, Hattori, Daniels & Adrian , LLP.
LandOfFree
Liquid crystal variable wavelength filter unit, and driving... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Liquid crystal variable wavelength filter unit, and driving..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid crystal variable wavelength filter unit, and driving... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3750368