Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1991-05-31
1992-08-18
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250211J, 25022724, 357 19, 357 30, H01J 4014
Patent
active
051401525
ABSTRACT:
A semiconductor optoelectronic device provides full duplex data communication over a single optical fiber. The semiconductor device comprises a unitary P-N light emitting portion and an N-I-P photodiode portion. The light emitting portion and the photodiode portion share a common electrode for connection to operating voltage sources. The second electrode of the light emitting portion contains a window that is associated with one end of the optical fiber. A source of operating voltage for the light emitting portion is connected to the common electrode, and through data controlled switch means and a first resistance means to the second electrode of the light emitting portion. A source of operating voltage for the photodiode portion is connected to the common electrode, and through a second resistance means to a second electrode of the light emitting portion. Differential amplifier means is connected to receive the voltage developed across the first and second resistance means. The output of the differential amplifier means is a measure of the any data-containing light transmission that may be received from the end of the optical fiber, independent of the state of energization of the light emitting portion.
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Hancock Earl C.
Nelms David C.
Shami K.
Sirr Francis A.
The University of Colorado Foundation Inc.
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