Coherent light generators – Particular component circuitry – Optical pumping
Patent
1996-05-22
1998-06-02
Healy, Brian
Coherent light generators
Particular component circuitry
Optical pumping
372 29, 372 34, H01S 300
Patent
active
057612307
ABSTRACT:
A laser-diode driving circuit that ensures that the optical output of a laser diode will be stable within a wide temperature range. This circuit includes a reference voltage generator for generating a reference voltage, a control voltage generator for generating a control voltage, an amplifier for producing an amplified output signal corresponding to the difference between the reference voltage and the control voltage, and a driving current generator for generating a driving or operating current for driving a laser diode. The driving current generator is driven by the amplified output signal. The control voltage has a temperature dependence approximately the same as that required for keeping an optical output of the laser diode at a specified level independent of the ambient temperature change. Preferably, the control voltage generator contains a p-n junction diode for producing a temperature-dependent voltage, and a thermistor for compensating the temperature-dependent voltage to thereby produce said control voltage having an exponential characteristic with respect to the ambient temperature.
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Patent Abstracts Of Japan, vol. 10, No. 121 (E-401) (2178).
Oono Hiroshi
Yokomizo Masaaki
Healy Brian
NEC Corporation
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