Temperature control system for DFB lasers based on digital PID

doi:10.3969/j.issn.1007-5461.2025.06.007

Abstract

Abstract: Distributed feedback (DFB) semiconductor lasers are core components of gas sensors based on tunable diode laser absorption spectroscopy technology, and their output wavelength stability is affected by the stability of operating temperature. In order to provide stable and reliable light source for DFB lasers, a high stability laser temperature control system based on an integral-separated proportionalintegral-derivative (PID) algorithm has been developed in this work. Using the thermoelectric cooler (TEC) inside the laser as the temperature control element and the negative temperature coefficient thermistor as the temperature measurement element, we design a TEC driving circuit based on pulse width modulation technology and a high-precision temperature acquisition circuit for the system, Using the temperature control system, the temperature control test of 1654 nm DFB laser is carried out. The experimental results show that the temperature control range of the system is 15~35 ℃, the response time is lower than 13 s, the temperature control accuracy of the system reaches ±0.002 ℃ within 2 hours, and the temperature stability reaches 0.016%. Using this temperature control system, the DFB laser operates stably with an output wavelength standard deviation of 0.00011 nm.

Key words: optoelectronics, distributed feedback semiconductor laser, proportional-integral-derivative algorithm, high stability, temperature control

CLC Number:

TN248.4

YU Zhichao , , YAO Lu , KAN Ruifeng , SUN Fangliang , , XU Zhenyu , ZHANG Xianyi . Temperature control system for DFB lasers based on digital PID[J]. Chinese Journal of Quantum Electronics, 2025, 42(6): 795-805.

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