US Patent 6891983 Wavelength filter and polarizer

Patent 6891983 was granted and assigned to Photodigm on May, 2005 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Patent Applicant

Current Assignee

Photodigm

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

68919830

Patent Inventor Names

Jacob Meyer Hammer0

Date of Patent

May 10, 2005

Patent Application Number

103076120

Date Filed

December 2, 2002

Patent Primary Examiner

Michael G. Lee

Patent 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.