Optical waveguides – Integrated optical circuit
Reexamination Certificate
2007-07-17
2007-07-17
Kim, Ellen E. (Department: 2874)
Optical waveguides
Integrated optical circuit
C385S024000, C385S037000
Reexamination Certificate
active
10222218
ABSTRACT:
A tunable optical filter includes a tunable Fabry-Perot (FP) filter, two tunable waveguide Bragg gratings (WBGs) and a 2×2 3-dB coupler. In one embodiment, the WBGs are implemented in a silicon substrate using polysilicon filled trenches. The FP filter is implemented with two silicon nitride trench WBGs with a gap region between them. The FP filter and the WBGs are respectively tuned to transmit and reflect a selected wavelength. A broadband optical signal is propagated into a first port of the coupler. The coupler propagates half of the beam to one WBG and the other half to the other WBG. The WBGs reflect these portions back to the coupler, which then propagates the reflected portions to the FP filter.
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Blakely , Sokoloff, Taylor & Zafman LLP
Kim Ellen E.
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