Polarization-insensitive fabry-perot tunable filter

Details Polarization-insensitive fabry-perot tunable filter Polarization-insensitive fabry-perot tunable filter

1996-04-09

1998-07-14

Sikes, William L.

Liquid crystal cells, elements and systems

Liquid crystal optical element

Liquid crystal etalon

349119, 349121, 349172, G02F 11335, G02F 1139

Patent

active

057812683

ABSTRACT:
This invention provides polarization-independent optical filters that are Fabry-Perot filters. The inventive filters incorporate a phase modulator within the FP cavity and two quarter-wave plates, one on either side of the phase modulator, in the cavity. The quarter-wave plates are perpendicular to each other and oriented at .+-.45.degree. with respect to the optic axis of the phase modulator. A variety of phase modulators including those that incorporate nematic and smectic liquid crystal optical modulators can be employed in these FP filters. The filters of this invention are particularly useful in fiber optic systems and in telecommunications applications at 1550 nm.

REFERENCES:
patent: 5033825 (1991-07-01), Ishikawa et al.
patent: 5150236 (1992-09-01), Patel
patent: 5168383 (1992-12-01), Iwaki et al.
patent: 5321539 (1994-06-01), Hirabayashi et al.
patent: 5552912 (1996-09-01), Sharp et al.
Evans, J.W. (Mar. 1949), "The Birefringent Filter," J. Opt. Soc. Am. 39(3):229-242, Mar. 1949.
Title, A.M. and Rosenberg, W.J. (1981), "Tunable birefringent filters," Opt. Eng. 20(6):815-823, Dec. 1981.

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