Optical waveguides – Polarization without modulation
Patent
1995-04-12
1996-12-03
Lee, John D.
Optical waveguides
Polarization without modulation
359497, 359501, 385 27, G02B 627
Patent
active
055816401
ABSTRACT:
The present invention provides for a two-stage optical isolator with reduced polarization mode dispersion. Each stage has two birefringent polarizers separated by a Faraday rotator. The polarizers in each stage are oriented with respect to each other to operate conventionally as an optical isolator for light in a backward direction. However, the polarizers in each stage are oriented with respect to the polarizers in the other stage so that a polarization mode along one direction, say, the ordinary direction, of light in the first stage travelling toward the second stage is aligned along the opposite, extraordinary, direction in the second stage and vice versa. In this manner the component of any polarization travels the same optical distance through the optical isolator to substantially reduce polarization mode dispersion. The birefringent polarizers and Faraday rotators of multiple stages can also be fitted into a single magnet to substantially reduce the sensitivity of the optical isolator to changes in wavelength.
REFERENCES:
patent: 4762384 (1988-08-01), Hegarty et al.
patent: 5082343 (1992-01-01), Coult et al.
patent: 5208876 (1993-05-01), Pan
patent: 5317655 (1994-05-01), Pan
Pan Jing-Jong
Shih Ming
Xu Jingyu
E-Tek Dynamics, Inc.
Lee John D.
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