Optical waveguides – With optical coupler – Particular coupling structure
Patent
1997-02-14
1998-08-25
Sanghavi, Hemang
Optical waveguides
With optical coupler
Particular coupling structure
385 34, 359131, G02B 626, G02B 632
Patent
active
057991219
ABSTRACT:
An optical device is provided having an input and an output terminal spaced equidistant from an optical axis of a graded index lens. An at least partially reflective surface is disposed spaced but adjacent from another end face of the graded index lens. The optical path length from the input or output terminal to a first end face of the lens is equal to the optical path length from the other end face of the lens to the at least partially reflective surface. The graded index lens has a length that collimates light launched from the input terminal to the at least partially reflective surface. Moving the input an output terminals toward or away from one another changes the angle at which light exits the other end face of the graded index lens, and thus changes the angle at which light is incident upon the at least partially reflecting surface. Conveniently, if the at least partially reflecting surface is a WDM interference filter, tunability of the filter is achieved by moving the input an output terminals toward or away from one another.
REFERENCES:
patent: 4474424 (1984-10-01), Wagner
patent: 4486071 (1984-12-01), Levinson
patent: 4521071 (1985-06-01), Bohm
patent: 4550975 (1985-11-01), Levinson et al.
patent: 5555330 (1996-09-01), Pan et al.
patent: 5612824 (1997-03-01), Si et al.
Cheng Yihao
Duck Gary S.
JDS Fitel Inc.
Sanghavi Hemang
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