Numerical control driving method and device of super-radiance light emitting diode

Abstract

The present invention discloses a numerical control driving method and an apparatus for a superradiance light emitting diode. A step response method is used. At the beginning of starting the apparatus, a PID parameter which effectively controls a thermoelectric refrigerator is acquired and is used for a PID control algorithm. The deviation of a thermistor temperature signal and a stated temperature signal is compared. The signal is outputted to the thermoelectric refrigerator through the control of the PID. The thermoelectric refrigerator is controlled to generate a corresponding cooling capacity, so the work environment temperature of a SLD is improved and the temperature stability of the SLD is improved. The present invention is capable of being applicable for the superradiance light emitting diodes produced by various manufacturers and has strong applicability. In addition, the present invention is capable of adjusting a control parameter according to different work environments, so the problem that the control of the fixed parameter is not capable of adapting the environment temperature change is effectively overcome. The control accuracy is improved and the output power of SLD and the stability of a central wavelength are effectively improved.

Description

technical field [0001] The invention relates to a numerical control driving method and a device for a superluminescent light-emitting diode. Background technique [0002] Fiber optic gyroscope is an angular velocity sensor with a wide range of military and civilian application backgrounds. Superluminescent light-emitting diodes (SLDs), which have short-term coherence and long-term spatial coherence, are widely used as light sources for fiber optic gyroscopes. Since the stability of the SLD light source has a great influence on the accuracy of the gyroscope, it is extremely important to control the stable output of the SLD - optical power, optical wavelength, and polarization characteristics. The currently widely used SLD driving method is "constant current + temperature control". The constant current source is loaded to the SLD die, and the operating temperature of the SLD is controlled by a TEC (thermoelectric cooler), so as to achieve current and temperature stability. T...

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Problems solved by technology

The control of temperature usually adopts analog P (proportional) control or PI (proportional integral) control, and fixed parameter PID (proportional integral differential) digital control. This type of control method cannot effectively make appropriate adjustments to the changes in the SLD working environment. , the output characteristics of the light source vary greatly with the temperature of the working environment, and the control accuracy is low

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