VCSEL monitoring using refracted ray coupling
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United States of America Patent
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Aug 17, 2004
Grant Date -
Apr 25, 2002
app pub date -
Sep 28, 2001
filing date -
Oct 2, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for monitoring the optical power output of a VCSEL uses refracted ray coupling to direct rays refracted out of an optical transmission medium, towards a photodetector. The photodetector is coupled to feedback circuitry and laser control circuitry capable of adjusting the VCSEL based on the monitored power output. A portion of the rays that enter the optical fiber are refracted out of the optical fiber by means of high-index materials and directed toward the photodetector by reflective surfaces situated around the coupling region in which the VCSEL is coupled to the optical fiber.
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