基于功率转移函数的全光整形器性能评估

Assessment of Performance for All-optical Reshapers Based on the Power Transfer Function

基于输入/输出功率转移函数的线性化三段模型,考察了全光整形器性能的理论评价方法,通过构建一个光纤四波混频整形仿真系统,验证了这种方法的合理性.分析了高斯分布的输入信号对全光整形器输出性能的影响.根据输入信号特性,将转移函数曲线由低到高分为五个区域,当信号"1"的均值落在第五区域时可获得较高的品质因数值和误码率性能的提升.最佳工作状态下,随着转移函数中间段斜率的增加,全光整形器输出信号品质因数值和误码率性能的提升会趋于饱和,但消光比有一个线性的增加.

According to the linearized three-section modet ot input/output touv （TF）, the theoretical assessment method of all-optical reshapers＇ performance is investigated and verified by simulation of four-wave-mixing-based scheme. The performance of all-optical reshapers dependent on the input signal of Gaussian distribution is analyzed. The transfer function is divided into five regions from low to high power levels, and a larger improvement of quality factor or BER performance can be obtained for the cases that the average level of mark pulses exists in the fifth region. With the increase of the TF＇s second-section slope for a desirable reshaper, the gain saturation of quality factor or BER performance will occur and the extinction ratio will be improved linearly.