Multiply periodic refractive index modulated optical filters
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United States of America Patent
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May 23, 2000
Grant Date -
N/A
app pub date -
Sep 2, 1998
filing date -
Sep 2, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high transmission comb-like optical filter structure in wave guiding media is described, an example of which includes multiply periodic modulation of length L=UL.sub.R where U represents an integer number of identical periods of length L.sub.R and L.sub.R is the length of a series of periodically modulated elements of length s.sub.v =M.sub.v d.sub.v, v=1 to V, where M.sub.v is an integer number of cycles of length d.sub.v. Individual filter elements of length s.sub.v of a filter of the invention compared to the reflectors bounding a conventional or series coupled Fabry-Perot cavity exhibit moderate to low reflectivity. Modulation of individual filter elements may be step-wise constant, sinusoidal, or other forms of refractive index modulation.
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