Optical communications – Receiver – Including optical element
Reexamination Certificate
2006-09-12
2006-09-12
Payne, David C. (Department: 2613)
Optical communications
Receiver
Including optical element
C398S202000, C398S139000, C385S049000
Reexamination Certificate
active
07106980
ABSTRACT:
An optical receiver, small and inexpensive, is used for a WDM transmission system in place of a wavelength demultiplexer. In the receiver, a light-transmitting medium and a photodiode (PD) are placed on the same substrate, a wavelength-selecting filter is attached perpendicularly or obliquely to the end face of or to a cut section at the midpoint of the medium, the filter transmits only the assigned wavelength included in the incident light having multiplexed wavelengths, and the PD detects only the assigned wavelength. With an optical fiber, the fiber can be housed in a ferrule. In this case, the filter is inserted into a filter-supporting hole provided at a midpoint of the ferrule, the ferrule is fixed in a groove formed on the substrate, and an optical pathway-changing groove formed on the substrate reflects light having emerged from the optical fiber to introduce it into the PD.
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Y. Murakami et al. “Development of Simplified WDM System—Development of Compact EDFA and Optical Receiver Provided with Optical BPF”Technical Report of IEICE OCS99-60(Sep. 1999) pp. 41-46.
Kuhara Yoshiki
Nakanishi Hiromi
Yamabayashi Naoyuki
Payne David C.
Smith , Gambrell & Russell, LLP
Sumitomo Electric Industries Ltd.
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