Apparatus for obtaining derivative of characteristic curve,...

Details Apparatus for obtaining derivative of characteristic curve,... Apparatus for obtaining derivative of characteristic curve,...

H - Electricity

04

B

315/24

H04B 10/00 (2006.01) H01S 3/137 (2006.01) H01S 5/068 (2006.01) H04B 10/155 (2006.01)

Patent

CA 1277364

ABSTRACT APPARATUS FOR OBTAINING DERIVATIVE OF CHARACTERISTIC CURVE, AND METHOD OF CONTROLLING OPERATION, OF ELECTRONIC DEVICES. A novel technique for stabilizing an electronic device (40), e.g for stabilizing the bias current of a semiconductor laser at or near the lasing threshold of the device, comprises determining a derivative (in 100) of a variable characteristic of the device operation, e.g. the voltage across the laser, with respect to a parameter, e.g. the laser bias current. The derivative is determined by injecting one or more nonsinusoidal ac current (ITEST)components into the laser, and phase-sensitively detecting the voltage changes at the ac frequenices. An error voltage obtained (by 101-104) from the derivative is used to control the bias current (in 105). The derivative extraction method can also be embodied in measurement apparatus, and is useful in other process control applications.

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