Optical filters
First Claim
1. An optical filter comprising a plurality of stacked optical cavities each having substantially the same thickness, wherein an oxide support layer is provided between adjacent cavities defining an air spacing, the filter having a first frequency response for transmission through the filter comprising a first comb response and a second frequency response for reflection from the filter and comprising a second comb response, the peaks of the first comb response lying between the peaks of the second comb response.
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Accused Products
Abstract
A multi cavity comb filter for interleaving or de-interleaving WDM signals has a plurality of stacked optical cavities each having substantially the same thickness. The multiple cavity arrangement provides a comb reflection response and a comb transmission response with broad peaks, so that the filter can be used for transmitting one group of channels and reflecting another group of channels at interleaved positions. The cavities are preferably formed from silicon wafers, so that existing techniques can be employed to obtain specific cavity thicknesses with sufficient accuracy and uniformity.
7 Citations
12 Claims
- 1. An optical filter comprising a plurality of stacked optical cavities each having substantially the same thickness, wherein an oxide support layer is provided between adjacent cavities defining an air spacing, the filter having a first frequency response for transmission through the filter comprising a first comb response and a second frequency response for reflection from the filter and comprising a second comb response, the peaks of the first comb response lying between the peaks of the second comb response.
Specification