Waveguide mach-zehnder optical isolator utilizing transverse...

Details Waveguide mach-zehnder optical isolator utilizing transverse... Waveguide mach-zehnder optical isolator utilizing transverse...

2005-09-13

2005-09-13

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

C359S240000, C359S280000

Reexamination Certificate

active

06943932

ABSTRACT:
A device and method for optical isolation for use in optical systems is disclosed. The device provides for a waveguide optical isolator fabricated using two arms, made of optical waveguides comprising magneto-optical material, in a Mach-Zehnder interferometer configuration. The device of the present invention operates using the TM mode of a light wave and, thus, does not require phase-matching of TM and TE modes. Further, the present invention does not use polarizers to extinguish the optical feed-back.

REFERENCES:
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patent: 5479551 (1995-12-01), DiGiovanni et al.
patent: 5686990 (1997-11-01), Laznicka, Jr.
patent: 6611644 (2003-08-01), Galstian
Fujita et al, “Waveguide optical isolator based on Mach-Zehnder interferometer”, Apr. 17, 2000, vol. 76, pp. 2158-2160.
Mizumoto et al, “In-Plane Magnetized Rare Earth Iron Garnet for a Waveguide Optical Isolator Employing Nonreciprocal Phase Shift”, Nov. 1993, vol. 29, pp. 3417-3419.

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