| 摘要 |
An optical interference filter ( 2 ) is provided by a substrate ( 1 ) in which is formed a plurality of parallel slots so as to define layers (slots and substrate laminae) of alternating refractive index. As shown, the filter comprises a central Fabry-Perot resonator slot cavity ( 3 ) between two mirror groups ( 4, 5 ) of alternating slots and substrate laminae, 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 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. |
