Dual stage optical device with low polarization mode dispersion

Details Dual stage optical device with low polarization mode dispersion Dual stage optical device with low polarization mode dispersion

1994-12-13

1996-10-15

Lee, John D.

Optical waveguides

Polarization without modulation

359497, 385 15, 385 31, G02B 627

Patent

active

055662595

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.

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

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