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由于相干布居振荡效应,光脉冲通过处于吸收状态的掺铒光纤介质时,将导致群速度传输减慢.由掺铒光纤的吸收特性可知,此时必伴随着强烈的吸收损耗,这势必会给实际的慢光信号测量及光通信领域带来诸多的困难.从铒离子基态粒子速率方程出发,对损耗可控条件下的光速减慢传输进行了数值仿真研究,并加以实验验证.研究表明:抽运光强度越高,信号光损耗系数越小;抽运掺铒光纤长度越长,信号光损耗系数越小.通过优化抽运光强度、掺铒光纤长度等参量,可以实现损耗可控条件下的光脉冲群速度减慢传输.
Due to the oscillatory effect of coherent population, when the light pulse passes through the erbium-doped fiber medium in absorption state, the group velocity transmission will be slowed down, which is bound to be accompanied by the strong absorption loss due to the absorption characteristic of the erbium-doped fiber Which brings a lot of difficulties in the field of actual slow optical signal measurement and optical communication.From the ground state particle velocity equation of erbium ion, the numerical simulation on the slowing down of the light velocity under the controllable loss condition is carried out and verified by experiments. : The higher the pump light intensity, the smaller the signal light loss coefficient; the longer the pump erbium-doped fiber length, the smaller the signal light loss coefficient. By optimizing the pump light intensity, erbium-doped fiber length and other parameters, can achieve loss control Under conditions of light pulse group slow transmission.