Method of index trimming a waveguide and apparatus formed of the same
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United States of America Patent
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Jul 27, 2004
Grant Date -
Feb 20, 2003
app pub date -
Aug 16, 2001
filing date -
Aug 16, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of using a beam of ultra-short laser pulses, having pulse durations below 10 picoseconds, to adjust an optical characteristic within an optical medium is provided. The beams would have an intensity above a threshold for altering the index of refraction of a portion of the optical medium. The beams could be selectively applied to the optical medium and any structures formed or existing therein. Thus, the beam could be moved within a waveguide in the optical medium to alter the index of refraction of the waveguide forming any number of different longitudinal index of refraction profiles. The beam could also be moved within the optical medium near the waveguide to alter an effective index of refraction of a signal traveling within the waveguide. The techniques described can be used to improve, alter or correct performance of waveguide-based optical devices, such as arrayed waveguide gratings and cascaded planar waveguide interferometers.
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