Optical circulator

Details Optical circulator Optical circulator

1995-05-16

1996-11-12

Healy, Brian

Optical: systems and elements

Polarization without modulation

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

359483, 359494, 359495, 359496, 359497, G02B 530

Patent

active

055745962

ABSTRACT:
The optical circulator according to the present invention comprises two birefringent crystal end-plates, non-reciprocal Faraday rotators inserted between birefringent crystal plates, and a pair of matched birefringent crystal plates disposed between the rotators. The first birefringent crystal end-plate functions as a dividing and combining means for dividing a beam into two beams of orthogonal electric field vectors from different paths into one on the same path. The pair of matched birefringent crystal plates serve as beam path determining means shifting a beam to a different direction depending on the direction of the electric field vector and the propagation. The pair of crystal plates are substantially identical but oppositely oriented, such that the pair of means have opposite beam shifted directions.

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patent: 5381261 (1995-01-01), Hirai et al.
patent: 5428695 (1995-06-01), Ohta
patent: 5471340 (1995-11-01), Cheng et al.
patent: 5499307 (1996-03-01), Iwatsuka

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