Optical waveguides – With optical coupler – Plural
Reexamination Certificate
2007-04-17
2007-04-17
Pak, Sung (Department: 2874)
Optical waveguides
With optical coupler
Plural
C385S027000
Reexamination Certificate
active
10442443
ABSTRACT:
A new filter architecture uses subband division and a reflector structure. A de-multiplexer/multiplexer combination creates N subband branches comprising dispersive elements, phase control elements, and/or delay elements. The new structure yields high spectral accuracy across the filter's overall free spectral range (FSR). In one embodiment of the inventive filter, the overall filter has a free spectral range (FSR) of F, and the first multiband filter (MBF) has a FSR ofFfmbf=FN.The N subband outputs of the first multiband filter create a plurality of branches. Each branch comprises a dispersive element and optionally one or more elements such as a phase control element and/or a delay element. A reflector at the end of each of these branches reflects the light back through the branches and each of the MBFs and the first MBF.
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Lucent Technologies - Inc.
Pak Sung
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