Coherent light generators – Particular temperature control
Patent
1986-12-22
1988-12-20
Sikes, William L.
Coherent light generators
Particular temperature control
372 36, 357 87, H01S 304
Patent
active
047929570
ABSTRACT:
A laser temperature controller is disclosed for controlling the temperature of a laser device. The controller includes a bridge circuit connected to a thermistor device which is mounted on the laser package. The bridge circuit generates error signals representing a need for cooling or heating as the operating temperature of the laser rises or falls about a set threshold. A voltage conversion circuit converts the error signals to a positive or negative polarity voltage. The output of the voltage conversion circuit is applied to a pair of operational amplifiers which input the voltage and compare it to a set reference voltage. When cooling is required a first amplifier provides a biasing voltage to a transistor when a set threshold is exceeded. The associated transistor switches drive current to a thermoelectric device mounted on the laser package thereby, cooling the laser. Similarly, when heating is required a second amplifier and transistor switches current of an opposite polarity to the thermoelectric device, which heats the laser. The output signal from the voltage conversion circuit is also applied to a laser temperature alarm circuit which provides a visual indication and an alarm signal to a controller interface when a set threshold of laser temperature is exceeded.
REFERENCES:
patent: 4571728 (1986-02-01), Yoshikawa
patent: 4631728 (1986-12-01), Simons
patent: 4683573 (1987-07-01), Albanese
patent: 4689659 (1987-08-01), Watanabe
patent: 4727554 (1988-02-01), Watanabe
patent: 4737798 (1988-04-01), Lonis et al.
GTE Communication Systems Corporation
Miologos Anthony
Sikes William L.
Thi Vo Xuan
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