Optical: systems and elements – Light interference – Produced by coating or lamina
Reexamination Certificate
2006-08-15
2006-08-15
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Light interference
Produced by coating or lamina
C359S577000, C359S583000, C359S580000, C356S519000, C385S031000, C385S073000
Reexamination Certificate
active
07092162
ABSTRACT:
An optical cavity is combined with a MUX or a de-MUX device having substantially the same free-spectral range in order to enhance the bandwidth of the device. The optical cavity can be tuned to shift the frequencies of maximum insertion loss to match the center frequency of each channel. The reflectivities of the reflective surfaces of the cavity are judiciously selected to produce the insertion-loss spectrum needed to optimize the desired result. Multiple cavities can be used in series to refine the shape of the pass-band spectrum. A frequency window is used to fine tune the free-spectral range of the cavity and to shift the peaks of its insertion-loss spectrum to the desired frequencies. Inner and outer cavity surfaces are oriented to eliminate interference from secondary reflections.
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Ai Chiayu
Hsieh Yung-Chieh
Assaf Fayez G.
Durando Antonio R.
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