| 摘要 |
The present invention provides a method and apparatus for improved wavelength filtering and for producing a wavelength filter with improved wavelength filtering. The wavelength filter may include a waveguide to transmit an optical signal through a substrate, and a periodic series of grooves across a portion of the waveguide to effect reflection of a portion of the signal, the grooves having varying depths into the waveguide, wherein the varying depths affect a spectrum of the reflected portion.
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