Optical waveguides – Optical waveguide sensor
Patent
1990-12-03
1992-09-01
Lee, John D.
Optical waveguides
Optical waveguide sensor
385126, G02B 622
Patent
active
051446901
ABSTRACT:
A coupling mechanism for a non-identical dual core optical fiber. The fiber is sensitized along selected portions of its length by coating the fiber in a pattern of bands of specified spacing with material that is sensitive to the presence of a predetermined parameter or environmental field. By virtue of inequality of propagation properties and mismatch of optical phase of the fields of the two cores, evanescent wave coupling is largely or wholly suppressed except in those portions of length coated in the specified spatially periodic manner. Optical power launched into one of the two cores remains propagating within that core alone over an extended length of the fiber, except for that period of time when the predetermined parameter or environmental field is sensed. The specific spatial periodicity of the pattern of coating bands on the outside of the fiber acts in concert with the nonidentical propagation parameters of the two cores to effect intercore coupling of optical energy. This coupling, representing sensitivity to any environmental field which causes strain in the coating, is effective only on those portions of the dual core fiber length which bear a specific coating pattern.
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Patent Abstracts of Japan, vol. 11, No. 197 (P-589) Jun. 25, 1987.
Corning Incorporated
Heartney Phan T.
Lee John D.
Simmons, Jr. W. J.
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