| 摘要 |
A high transmission comb-like optical filter structure in wave guiding media is described, an example of which includes multiply periodic modulation of length L=ULR where U represents an integer number of identical periods of length LR and LR is the length of a series of periodically modulated elements of length sv=Mvdv, v=1 to V, where Mv is an integer number of cycles of length dv. Individual filter elements of length sv of a filter of the invention compared to the reflectors bounding a conventional or series coupled Fabry-Perot cavity exhibit moderate to low reflectivity. Modulation of individual filter elements may be step-wise constant, sinusoidal, or other forms of refractive index modulation.
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