Compact, low crosstalk, three-port optical circulator

Details Compact, low crosstalk, three-port optical circulator Compact, low crosstalk, three-port optical circulator

1997-02-25

2000-02-15

Lee, John D.

Optical waveguides

Polarization without modulation

359488, 359497, 385 15, G02B 627

Patent

active

060262028

ABSTRACT:
A miniature three-port optical circulator that comprises a first input/output (I/O) port, a second I/O port complementary to the first I/O port, and a second walk-off crystal located between the first I/O port and the second I/O port. The first I/O port includes a light coupling assembly, a first walk-off crystal and a split polarization rotator arranged in order along the optical axis. The light coupling assembly comprises a capillary and two optical fibers. The optical fibers are secured side-by-side in the bore of the capillary. The optical fibers each have a diameter of one half of the diameter of the bore. The cores of the optical fibers are separated from one another in a separation direction by a separation distance. The first walk-off crystal is located to receive the light beams and has a first walk-off direction perpendicular to the separation direction. The split polarization rotator is mounted adjacent the first walk-off crystal and has a positive half and a negative half. The split polarization rotator is located so that the polarization components of the light beams that are deviated by the first walk-off crystal pass through one of the positive half and the negative half, and the polarization components that are not deviated by the first walk-off crystal pass through the other of the positive half and the negative half. The second walk-off crystal has a second walk-off direction perpendicular to the first walk-off direction, and has a walk-off distance equal to the separation distance.

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