Optical circulator

Details Optical circulator Optical circulator

1997-08-25

1999-03-02

Ullah, Akm E.

Optical waveguides

Polarization without modulation

385141, G02B 600

Patent

active

058781765

ABSTRACT:
A multi-port optical circulator for transmitting light from incoming and outgoing ports circularly includes one or more birefringent crystal plates disposed adjacent to one another for dividing an input beam into two beams having orthogonal polarizations and for combining two beams having orthogonal polarizations into a singe beam. Polarization beam splitting cubes introduce a beam to an opposite direction depending on the direction of the polarization of the beam and thereby substantially reflecting only one of s and p-polarizations of the beam. A polarization rotator between the first dividing and combining birefringent crystal and said polarization dependent beam splitting cube makes two orthogonal polarization vectors parallel or the two parallel polarization vectors orthogonal to one another.

REFERENCES:
patent: 4653921 (1987-03-01), Kwon
patent: 4661699 (1987-04-01), Welmers et al.
patent: 4786126 (1988-11-01), Kramer
patent: 5097351 (1992-03-01), Kramer
patent: 5155606 (1992-10-01), Landesman
patent: 5204771 (1993-04-01), Koga
patent: 5471340 (1995-11-01), Cheng et al.

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