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激光通过光纤传输时,线宽越窄,受激布里渊散射的阈值就越低。高功率激光很容易产生受激布里渊散射,影响光信号的传输。对大功率半导体激光器进行小信号电流调制是解决这一问题的方法之一。在正弦小信号调制电流作用下,分布反馈式半导体激光器(DFB-SLD)输出的激光会发生频率偏移,光源线宽展宽,从而可以提高受激散射阈值,进而降低传输损耗。通过理论分析,给出了在正弦小信号低频调制电流作用下激光频率偏移量与调制电流幅度和频率关系的数学模型,进而设计相应的光路和电路进行实验测量,并借助数据拟合的方法给出了数学模型中的参数值。
When the laser is transmitted through the optical fiber, the narrower the linewidth, the lower the threshold for stimulated Brillouin scattering. High-power laser is easy to produce stimulated Brillouin scattering, affecting the optical signal transmission. Small-signal current modulation of high-power semiconductor lasers is one of the solutions to this problem. Under the action of sinusoidal small signal modulation current, the output laser of distributed feedback semiconductor laser (DFB-SLD) will have frequency offset and widening of light source line width, which can increase stimulated scattering threshold and reduce transmission loss. Through theoretical analysis, the mathematical model of the relationship between the laser frequency offset and the modulation current amplitude and frequency under the action of sinusoidal low-signal modulation current is given, and then the corresponding optical and electrical circuits are designed for experimental measurement. By means of data fitting The parameter values in the mathematical model are given.