Wavelength filter and polarizer

Details Wavelength filter and polarizer Wavelength filter and polarizer

2005-05-10

2005-05-10

Lee, Michael G. (Department: 2876)

Optical waveguides

Polarization without modulation

Reexamination Certificate

active

06891983

ABSTRACT:
A band-stop wavelength filter and TE-TM mode selector made using an absorptive layer on an optical waveguide is provided. At the correct thickness, refractive index, absorptive loss, and location of the absorptive layer, a relatively high fraction of guided-mode intensity flows in the absorptive layer for one polarization mode. A much smaller fraction flows for the perpendicular polarization mode and for wavelengths on both sides of the design center. The result is a broad-band-stop filter for the selected polarization mode. This device is capable of strong discrimination between TE and TM modes over a very broad bandwidth.

REFERENCES:
patent: 4672196 (1987-06-01), Canino
patent: 5185831 (1993-02-01), Kawashima
patent: 5469519 (1995-11-01), Chang et al.
patent: 6459829 (2002-10-01), Yamauchi et al.

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