Detection and Analysis System of Low Frenquency Electronic Noise in High Power Semiconductor Laser Diodes

Detection and analysis of noise are meaningful to nondestructive examination and reliability representation of high power semiconductor laser diodes. In this thesis a test and anaylysis bench was designed ,which can both test real electronic noise of the laser diodes and analysis with software.Under a series small current injection,we get the low frenquency 1/f electronic noise,Realized the separation of 1/f noise and zero mean white noise,using wavelet analysis using the test and analysis platform.Obtain the value of γ from the relationship between the frequency exponent factor γ and Hurst index ,then,realize the feature extraction of 1/f noise.