Research On Remaining Useful Life Prediction Technology Of Laser Diodes

Laser diodes are a class of lasers with a wide range of applications.As the core component of laser equipment,its performance and remaining life determine the performance and remaining life of laser equipment.Residual life is an important basis for reasonably arranging equipment or product maintenance strategies.Therefore,how to predict the remaining life of laser diodes becomes the key to formulating a maintenance strategy for laser equipment.The thesis focuses on the remaining life prediction of laser diodes.The main research contents include:1.Analysis of laser diode performance degradation mechanismObtaining characteristic parameters that characterize the remaining life of a laser diode is the basis for life prediction.Laser diodes have two typical degradation modes:active area degradation and cavity surface degradation.Active area degradation and cavity surface degradation will cause the threshold current to increase and the slope to decrease,and both will cause the optical power to decrease(constant current mode)or Increased operating current(constant power mode).Based on the analysis of the mechanism and influence of the two degradations,it is concluded that there is no interaction between them,and then the optical power(constant current mode)/working current(constant power mode)is selected as the characteristic parameter to characterize the remaining life of the conductor laser.2.Research on Prediction Method of Residual Life of Laser diodeIn view of the uncertainty and randomness of the degradation process of laser diodes,using optical power as a characterization parameter,a laser diode degradation model in constant current mode was constructed using the Wiener process,and the model parameters were identified using Expectation Maximization(EM).The Kalman filtering method was used to update the model,and the remaining life density function of the laser diode was obtained.Finally,experimental data was used to verify the effectiveness of the above prediction model and method,which laid a foundation for the implementation of the laser diode remaining life prediction.3.Accelerated degradation experiment of laser diode and realization of remaining life predictionIn order to further verify the effectiveness of the prediction model and method,a laser diode accelerated degradation experiment platform was built,an accelerated degradation experiment based on laser diodes was implemented,and the degradation experimental data was analyzed to obtain the degradation modes that occur within the laser diode.The remaining life prediction method can carry out the prediction of the remaining life,which can effectively predict the remaining life of the laser diode.