Optical circulator

Details Optical circulator Optical circulator

1997-10-02

1999-11-23

Spyrou, Cassandra

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

359494, 385 34, G02B 530, G02B 632

Patent

active

059910763

ABSTRACT:
An at least 3-port optical circulator has first group of optical components, and a second group of optical components, the first group being separated from the second group by an optical distance "1". Each group of optical components has a divider and combiner for dividing an input beam into two beams having orthogonal polarizations and for combining two beams having orthogonal polarizations into a single beam. Furthermore, each group has a GRIN lens for at least substantially collimating or focussing input light, and a polarization rotator between the first divider and combiner and the GRIN lens for making two orthogonal polarization vectors parallel or the two parallel polarization vectors orthogonal to one of or both of the first and second group of optical elements having beam shifting means disposed to shift two beams having a predetermined same polarization. The beam shifting means are of a thickness and orientation so that a beam of light that propagates from a first port sequentially to a second port and from the second port sequentially to a third port are shifted a distance equal to the distance between the optical axes of the first and the third ports.

REFERENCES:
patent: 5588078 (1996-12-01), Cheng et al.

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