Polarization independent optical nonreciprocal circuit based on

Details Polarization independent optical nonreciprocal circuit based on Polarization independent optical nonreciprocal circuit based on

1997-02-28

1999-05-18

Lee, John D.

Optical waveguides

Polarization without modulation

359494, 359497, 385 24, G02B6/27

Patent

active

059058234

ABSTRACT:
An inexpensive polarization independent optical nonreciprocal circuit which does not require a use of expensive birefringent crystals, optical branching circuits, and a phase adjustment. The optical nonreciprocal circuit is formed by at least one lens through which a light propagating between two waveguides passes; and a polarization rotation circuit for sequentially applying a nonreciprocal rotation and a reciprocal rotation to a first half of the light propagating between two waveguides, and sequentially applying a reciprocal rotation and a nonreciprocal rotation to a second half of the light propagating between two waveguides, so that the first half and the second half of a light propagating forward are set to have an identical polarization to form an even guided mode and coupled, while the first half and the second half for a light propagating backward are set to have opposite polarizations to form an odd non-guided mode and dissipated.

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"Polarization-Independent Silica-on-Silicon Mach-Zehnder Interferometers," Yaffe, et al., Journal of Lightwave Technology, Jan. 12, 1994, No. 1, p. 64.
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