Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1994-01-18
1995-04-04
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25022711, H01J 4014
Patent
active
054040060
ABSTRACT:
An optical receiver with an enhanced power capability and wide bandwidth is implemented by distributing a number of photodetectors along an optical transmission channel to convert respective portions of an optical signal into electrical signals. An electrical transmission line receives and accumulates signal inputs from the photodetectors. A velocity matching is established between the optical and electrical signals, allowing the photodetector outputs to accumulate coherently along the electrical transmission line, by loading the transmission line with distributed capacitance elements. The loading capacitances are preferably inherent in the photodetectors, which are designed and spaced apart from each other to yield the desired velocity matching. Possible photodetectors include p-i-n photodiodes with associated depletion layer capacitances, and metal-semiconductor-metal devices in which the capacitance is provided by interdigitated fingers that extend over an active optically absorbing layer on the waveguide from electrodes on either side.
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Loo Robert Y.
Ng Willie W.
Pikulski Joseph L.
Schaffner James H.
Denson-Low W. K.
Duraiswamy V. D.
Hughes Aircraft Company
Nelms David C.
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