The study of constant temperature and current control system for SLED

The stability of optical sources is required in many fiber optic sensor systems.This paper describes a high precision constant temperature and constant current control system for SLED, which is based on a singlechip computer.The system is able to control the temperature variation within ±0.01℃ and current drift under ±0.02mA by utilizing PID control algorithm, which meets the demands of the reliability and stability of the optical sources for sensor systems.