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Title: Polarization-independent optical wavelength filter for channel dropping applications

The polarization dependence of optical wavelength filters is eliminated by using waveguide directional couplers. Material birefringence is used to compensate for the waveguide (electromagnetic) birefringence which is the original cause of the polarization dependence. Material birefringence is introduced in a controllable fashion by replacing bulk waveguide layers by finely layered composites, such as multiple quantum wells using III-V semiconductor materials. The filter has use in wavelength-division multiplexed fiber optic communication systems. This filter has broad application for wavelength-tunable receivers in fiber optic communication links, which may be used for telecommunications, optical computer interconnect links, or fiber optic sensor systems. Since multiple-wavelength systems are increasingly being used for all of these applications, the filter is useable whenever a rapidly tunable, wavelength-filtering receiver is required. 14 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
228058
Assignee:
Univ. of California, Oakland, CA (United States) PTO; SCA: 440600; 990200; 990300; PA: EDB-96:081438; SN: 96001584037
Patent Number(s):
US 5,515,461/A/
Application Number:
PAN: 8-262,716
Contract Number:
W-7405-ENG-48
Resource Relation:
Other Information: PBD: 7 May 1996
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; OPTICAL FILTERS; DESIGN; DATA TRANSMISSION SYSTEMS; OPTICAL COMPUTERS; MEASURING INSTRUMENTS; USES; OPTICAL FIBERS