Variable polarization beam splitter, combiner and mixer

Details Variable polarization beam splitter, combiner and mixer Variable polarization beam splitter, combiner and mixer

1997-03-14

1998-04-14

Ullah, Akm E.

Optical waveguides

Polarization without modulation

385 16, 385 34, 349196, G02B 600, G02F 11335

Patent

active

057402884

ABSTRACT:
Collimated light from two input fibers are directed against the interface of a beam splitter cube formed by two right-angle prisms. Light transmitted through, or reflected by, depends upon the polarization of the incoming light. A collimator subassembly for an output fiber receives light from the beam splitter cube. Polarization of the incoming light is controlled by orientation of the optical axes of one or two liquid crystal cells placed between each input fiber and beam splitter cube. By controlling the optical axes of the liquid crystal cells light from the two input fibers can be sent to the output fiber in any desired ratio. By rearranging the optical fibers, right-angle prisms and liquid crystal cells, a variable polarization beam combiner can be formed. A combination of the variable polarization beam combiner and beam splitter provides a variable polarization beam mixer, in which two input light signals can be combined and then split into two different output signals by control of liquid crystal cells. Finally, birefringent crystals and laminated beam splitter plates may also be used for the right angle prisms.

REFERENCES:
patent: 4478494 (1984-10-01), Soref
patent: 4702557 (1987-10-01), Beckmann et al.
patent: 4948229 (1990-08-01), Soref
patent: 4959540 (1990-09-01), Fan et al.
patent: 5111321 (1992-05-01), Patel
patent: 5414541 (1995-05-01), Patel et al.
patent: 5477350 (1995-12-01), Riza et al.

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