Optical transmitter

Details Optical transmitter Optical transmitter

1984-04-13

1986-04-01

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

372 33, 372 38, 455618, H04B 900

Patent

active

045802947

ABSTRACT:
A transmitter employing a light-emitting diode as an output element, this element being included in series with a resistor in the output circuit of a difference amplifier the inverting input of which is coupled to the junction point of the diode and resistor, includes a network for compensating for the non-linear output power versus energizing current characteristic of the diode. This network comprises a field effect transistor (fet) biased to operate in the pre-pinch-off region and having its source-drain path connected to the diode. The source-drain path of the FET may shunt the diode and a further resistor in series therewith, or alternatively may be included in a feedback path to the inverting input of the amplifier.

REFERENCES:
patent: 3898583 (1975-08-01), Shuey
patent: 4369525 (1983-01-01), Breton et al.

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