A semiconductor laser temperature control system and its control method

Abstract

The invention discloses a semiconductor laser temperature control system and a control method thereof, comprising a temperature sampling circuit connected to the semiconductor laser, an A / D converter connected to the temperature sampling circuit, a keyboard control, a display module, an alarm module, a single-chip microcomputer system and related The connected TEC temperature control chip and the TEC driving circuit are connected with the A / D converter, the keyboard control, the alarm module, the display module and the TEC driving circuit on the single chip microcomputer system. The temperature sampling circuit collects the temperature information of the controlled object and transmits it to the single-chip microcomputer system through the A / D converter. The single-chip microcomputer system processes the temperature information, outputs the duty cycle of the PWM signal and transmits it to the TEC drive circuit to generate the required control information to drive the TEC temperature. The control chip works. The invention combines single-chip microcomputer control, uses the TEC drive circuit to drive the TEC temperature control chip to work, and realizes the automatic temperature control through the double PID serial control algorithm in the algorithm. The invention has high automation, high temperature control precision, good safety performance and convenient operation.

Description

technical field [0001] The invention relates to a temperature control system, in particular to a semiconductor laser temperature control system and a control method thereof. Background technique [0002] With the rapid development of information technology, semiconductor lasers have been widely used in optical fiber communication, optical fiber sensing and laser radar and other fields. Since the output wavelength of the laser gradually drifts to the long wavelength direction with the increase of the device temperature, in addition, in a highly integrated device structure, excessively high temperature will reduce the performance of the components, or even burn the components. To a certain extent, the stability and reliability of electronic devices are reduced. Therefore, it is necessary to adopt appropriate temperature control technology for semiconductor lasers or systems to ensure that semiconductor lasers or systems can work normally. To this end, researchers have done r...

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Problems solved by technology

[0003] The above prior art has certain use value, but the temperature acquisition accuracy of the temperature acquisition circuit of these systems is not high, mainly because what the temperature acquisition circuit utilizes is that the electric bridge circuit causes, does not have high-precision algorithm to control simultaneously, makes In the process of temperature control, there will be temperature overshoot and temperature fluctuation in constant temperature control, and the response speed of the system is slow. Therefore, the application of these systems and methods is narrow, which limits their use in the temperature of high-precision semiconductor lasers. Applications in control systems

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