光纤延时自外差法测量DFB型LD温度调谐的瞬态特性

All-fiber delayed self-heterodyne interferometer for measuring the transient characteristics of single-mode DFB LDs under temperature modulation

以马赫-曾德干涉仪(MZI)原理为基础搭建了臂长差为3km的光纤延时自外差(FOSHI)测量系统,测量了1 582nm分布反馈型(DFB)二极管激光器(LDs)在温度调谐下输出的瞬态特性,包括LDs输出波长及线宽。结果表明,DFB LDs输出光波长随调谐温度呈线性关系,通过对光电流功率谱密度函数的洛伦兹线型拟合得到LDs的线宽为3.24MHz,与3MHz理论值相近。

The all-fiber delayed self-hetrodyene interferometer（FDSHI） system with 3 km optical path difference is established based on the principle of Mach-Zehnder interferometer（MZI）.The output transient characteristics,including the output wavelength and linewidth,of the 1 582 nm distributed feedback（DFB） laser diode（LD） under temperature modulation are measured.The results indicate that the output wavelength of the DFB LD varies with temperature linearly.Through Lorentzian fitting for the optical current power spectral density function,we achieve that the LD linewidth is 3.24 MHz which is close to the theoretical value of 3 MHz.