Optical circulator

Details Optical circulator Optical circulator

1997-12-08

1999-06-01

Spyrou, Cassandra

Optical: systems and elements

Polarization without modulation

Polarization using a time invariant electric, magnetic, or...

359494, 359495, G02B 530

Patent

active

059093102

ABSTRACT:
An improved optical circulator device transfers light from a first optical fiber to a second optical fiber, and from the second fiber to a third optical fiber. The device comprises reciprocal and non-reciprocal polarization rotators, birefringent beam splitters and combiners, and a birefringent walk-off element. The invention also contains a polarization-dependent light bending device comprising two tapered birefringent plates. The light bending device compensates for an angle between a first light beam emanating from the first fiber and a second light beam exiting through the third fiber. The existence of this angle allows the first and third fibers to be coupled to the light beams using a single lens.

REFERENCES:
patent: 4978189 (1990-12-01), Blonder et al.
patent: 5319483 (1994-06-01), Krasinski et al.
patent: 5408354 (1995-04-01), Hosokawa
patent: 5471340 (1995-11-01), Cheng et al.
patent: 5574596 (1996-11-01), Cheng
patent: 5729377 (1998-03-01), Bergmann

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