Polarization independent waveguide optical isolator and...

Details Polarization independent waveguide optical isolator and... Polarization independent waveguide optical isolator and...

2006-05-09

2006-05-09

Lee, John D. (Department: 2874)

Optical waveguides

Polarization without modulation

C385S015000

Reexamination Certificate

active

07043100

ABSTRACT:
Polarization independent optical isolator/circulator devices based on Mach-Zehnder interferometers. The devices utilize either polarization splitting and nonreciprocal polarization conversion or nonreciprocal phase shift within the interferometric arm. For devices with nonreciprocal phase shift, the relative phase difference is 0° in the forward propagation direction and 180° in the backward propagation direction, or vice versa, so that light goes into a bar or cross port depending on the propagation direction. The devices have advantages over previous designs in the use of inexpensive device components, simple alignment, minimal space requirement, and negligible polarization mode dispersion or polarization dependent loss. In addition, the devices can be made in a waveguide form with minimal loss and with high fabrication ease. An additional phase compensator and/or a variable attenuator can be integrated in order to relax the fabrication tolerances.

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m. Shirasaki, et al., “Compact polarization-independent optical circulator”, Applied Optics, Aug. 1, 1981, pp. 2683-2687, vol. 20, No. 15, Japan.

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