Coupling of Single-Mode Optical Fibers to GaAs Waveguides
Semiannual technical rept. no. 1, 1 Aug 1975-31 Jan 1976
WASHINGTON UNIV ST LOUIS MO LAB FOR APPLIED ELECTRONIC SCIENCES
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An investigation was conducted to find an efficient method to couple a single-mode optical fiber to a GaAs waveguide at near infrared wave lengths. The general approach is to first fabricate a transitional waveguide. The fiber and the transitional waveguide are then coupled together by the tapered velocity coupling method. Step index transitional waveguide structures were fabricated and evaluated with a coupling efficiency of 77, a value close to theoretical limit. Fabrication of silica fiber horn was not successful due to the thermal properties of the silica fiber materials. Alternative methods are being investigated to match the cylindrical geometry of the fiber to the planar geometry of the uniform waveguide, replacing the fiber horn.
- Fiber Optics and Integrated Optics