To provide a new method of constructing and manufacturing a micro-optical filter.
An optical interference filter 2 is provided by a substrate 1 in which a plurality of parallel slots are formed so as to define layers (slots and substrate laminate) of alternating refractive index. As shown, the filter comprises a central Fabry-Perot resonator slot cavity 3 between two mirror groups of alternating slots and substrate laminate, and is coupled to optical fibers 7 accommodated in V-grooves 6 on either side. For tuning, one mirror group 5 may be movable in the direction of an arrow A, or, where the central resonator is provided by substrate material, by altering its temperature. One or more further Fabry-Perot filters may be formed in the substrate and coupled to the filter 2. The invention encompasses non-resonating filters.
SMITH GILBERT WILLIAM
MCNIE MARK EDWARD
Makoto Ono
Katsuma Osaki
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