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通过构建外部光反馈半导体激光器的理论模型,并结合激光器速率方程和噪声理论,讨论并优化了增益芯片和光纤光栅外腔各参数在不同电流下对器件频率噪声和相对强度噪声的影响。模拟结果表明:通过改变电流并对有源区尺寸、光纤光栅结构和耦合效率等参数的调整,在理论上可以将器件的频率噪声降低5×10~8 Hz左右,相对强度噪声降低8dB/Hz左右。该研究将为低噪声、窄线宽外部光反馈激光器的实验研究提供理论指导,同时也对其他结构的外腔激光器噪声特性的研究有着借鉴意义。
Through the theoretical model of the external optical feedback semiconductor laser and the laser rate equation and noise theory, the influences of various parameters of gain chip and fiber grating on the frequency noise and relative intensity noise of the device under different currents are discussed and optimized. The simulation results show that by changing the current and adjusting the size of the active region, the structure of the fiber grating and the coupling efficiency, it is theoretically possible to reduce the frequency noise of the device by about 5 × 10 ~ 8 Hz and reduce the relative intensity noise by 8 dB / Hz about. The research will provide theoretical guidance for experimental research on low noise, narrow linewidth external optical feedback lasers, and also provide reference for the study of noise characteristics of other structures of external lasers.