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Temperature control circuit of semiconductor laser device

A temperature control circuit and laser technology, applied in semiconductor lasers, lasers, laser parts and other directions, can solve the problems of peak current and average current error, temperature control circuit open-loop instability, slow regulation speed, etc., to improve test accuracy , Overcome nonlinear distortion, increase the effect of stability

Inactive Publication Date: 2017-03-29
祁艳
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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing temperature control circuit of semiconductor lasers, such as open-loop instability, error between peak current and average current, slow control speed, and low precision, improve the anti-noise performance of the temperature control circuit of semiconductor lasers, realize fast control speed, and be easy to control , high-precision performance, the present invention designs a semiconductor laser temperature control circuit applied to semiconductors for temperature control

Method used

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  • Temperature control circuit of semiconductor laser device
  • Temperature control circuit of semiconductor laser device
  • Temperature control circuit of semiconductor laser device

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Embodiment Construction

[0015] figure 1 Among them, the constant current source outputs current, and the voltage across the thermistor is the product of the output current of the current source and the resistor R7. The working temperature of LD is set by adjusting the partial pressure relationship of branches R8 and R9. When the measured temperature is equal to the set temperature, AV=0; when the LD operating temperature changes, R7 changes accordingly. It can be seen that the voltage change varies linearly with the resistance change. The temperature measuring branch circuit voltage and the temperature setting branch circuit voltage are input to ADN8830 through THERMIN pin and TEMPSET pin respectively.

[0016] figure 2 Among them, the constant current source module adopts AD706 operational amplifier, which has the characteristics of high input impedance and low power consumption. The feedback signal is input to the positive-phase input terminal of the operational amplifier, the negative-phase in...

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Abstract

The invention designs a temperature control circuit design of a semiconductor laser device for regulating temperature of a semiconductor. The circuit is simple in structure, high in output impedance, small in output voltage error, high in testing precision, and flexible in design, and capable of accelerating the system response, reducing the regulating time, and increasing the system stability. The defects that for the existing H-bridge temperature measurement circuit, nonlinear distortion is easy to produce, the regulation speed is slow, the stability is bad, and the regulation precision is low are overcome.

Description

technical field [0001] The invention relates to a temperature control circuit of a semiconductor laser, which is suitable for occasions where the temperature of the semiconductor needs to be regulated. Background technique [0002] Semiconductor lasers (LD) have the advantages of small size, high efficiency, low power consumption and easy modulation. At present, they are widely used in communication, medical treatment, precision processing and detection and other fields. The stability of LD operating temperature seriously affects its light extraction performance lI-al. First of all, the LD threshold current increases with the increase of temperature, under the condition of constant driving current. The output light power becomes stronger with the increase of temperature; secondly, the increase of temperature causes the wavelength of the output light to red shift, and the red shift amount is about 0.2—0.4 nm / 。 C, especially in some applications, there are strict requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/024
Inventor 祁艳
Owner 祁艳
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