Coherent light generators – Particular component circuitry – Optical pumping
Patent
1984-03-27
1986-06-10
Davie, James W.
Coherent light generators
Particular component circuitry
Optical pumping
372 26, 455609, H01S 310
Patent
active
045947171
ABSTRACT:
A circuit is shown for rapidly enabling and disabling a high current laser diode through a coaxial cable responsive to a data signal received at the circuit input. At the circuit input are two switching transistors, one or the other of which is forward biased while its counterpart is reverse biased, depending upon the level of the incoming data signal. The output of one of the switching transistors is fed to the base inputs of two emitter follower transistors, one PNP and the other NPN. The emitter terminals of the follower transistors are connected to the gate terminal of an enhancement mode VMOS field effect transistor. When the VMOS FET is enabled, current flows in the laser diode to energize it. The voltage level at the input to the follower transistors determines the voltage to the gate input of the FET. When the incoming data signal is low, the gate-to-source potential difference is near zero, thus preventing the FET from conducting current. A change to the high level for incoming data rapidly increases the gate-to-source voltage to enable the FET and activate the laser.
REFERENCES:
patent: 4027179 (1977-05-01), Kawamoto et al.
patent: 4243951 (1981-01-01), Wolkstein et al.
patent: 4295226 (1981-10-01), Dombrowski
patent: 4400812 (1983-08-01), Clark et al.
patent: 4412331 (1983-10-01), Chapman
Bracht Roger R.
Silvey Dorrel R.
Davie James W.
Genovese J. A.
Niebuhr F. W.
Optical Storage International-U.S.
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