Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2005-05-10
2005-05-10
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S569000, C385S016000, C385S037000, C385S024000, C356S328000
Reexamination Certificate
active
06891676
ABSTRACT:
An optical spectral filtering device and associated method for selectively directing a portion of a wavelength multiplexed input signal, entering through an optical fiber, into one or more output signals provided to one or more optical fibers and/or electronic outputs. The optical filtering is accomplished using free-space diffractive wavelength demultiplexing optics combined with a fixed (permanent) patterned structure located in the spectrally dispersed image plane. The structure can block or direct a selected spectral portion of the optical signal to one or more separate outputs, such as an optical fiber or power detector. A single active element in the optical path is used to spatially shift, or steer, the entire input spectrum at the dispersed spectral image plane, to control the portion of the input spectrum illuminating specific features on the permanent patterned structure.
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Ford Joseph Earl
Wilson Gordon
Assaf Fayez G.
Bookham Technology PLC
Brosemer Jeffery J.
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