基于PbS掺杂少模光纤的线偏振模放大

Linearly Polarized Modes Amplifier Based on PbS doped Few-Mode Fiber

本文采用改进的化学气相沉积(modified chemical vapor deposition,MCVD)法制备了一种新型少模光纤DD硫化铅(Pb S)掺杂少模光纤,研究了该光纤的荧光特性,并基于空间光调制器搭建了少模光纤放大系统,测量了光纤的模式增益特性。实验结果表明:在980 nm激光泵浦下,该光纤表现出超宽带近红外发光,光谱范围为1 050~1 650 nm;在1 540~1 560 nm波段范围内,实现了LP和LP模式放大,平均模式开关增益为4.5 d B,差模增益小于0.6 d B。该光纤为模分复用系统实现宽带模式放大提供了可行性。

In this paper,a new type of few-mode fiber,lead sulfide (Pb S) doped fewmode fiber is fabricated using modified chemical vapor deposition (MCVD) technique.The fluorescence characteristics of the fiber is characterized.A few-mode fiber amplification system based on the spatial light modulator is built,and the mode gain characteristics of the fiber are measured.The experimental results show that the fiber exhibits ultrawideband near-infrared luminescence when pumped by a 980 nm laser,and the spectral range is from 1 050 nm to 1 650 nm.The LPand LPmode amplifications are realized with the average modal on-off gain of 4.5 d B and the differential modal gain is less than0.6 d B within the band from 1 540 to 1 560 nm.The optical fiber provides the feasibility to realize broadband mode amplification in the mode division multiplexing system.