全光缓存器能够在光域内对数据包进行存储而不需经过光电光的变换,成为全光网的重要组成部分,其性能的优劣将直接影响到网络的丢包率等。但在半导体光放大器中交叉增益调制和交叉相位调制效应并存,导致基于半导体光放大器的环路型全光缓存器中缓存后输出的数据包与未缓存数据包的输出功率间存在不均衡,使得网络误码率增加。在详细分析全光缓存器工作原理的基础上,利用半导体光放大器中交叉增益调制和交叉相位调制并存的现象,巧妙地提出了将控制脉冲反相并配合电可调衰减器的新方法。该方法简单易行,有效解决了此类全光缓存器中数据包输出功率不均衡的难题,缓存器性能得到了极大改善。此方法适用于所有基于半导体光放大器的环路型全光缓存器。

Alloptical buffer can store the packet in optical domain without the opticalelectronicoptical conversion and becomes the important element in alloptical network. Its performance greatly influences the loss packet probability of network. But in semiconductor optical amplifier (SOA) cross phase modulation and cross gain modulation are coexisting. So in recircular alloptical buffer based on SOA, the output power between stored packet and packet without being stored is unbalanced and bit-error ratio of network increases. After analyzing the working principle of alloptical buffer, a new method for power equilibrium in recircular alloptical buffer based on SOA is presented. By changing the usual positive control pulse to negative and using an electronic variable optical attenuator, the buffer gets an uniform output power and its performance is improved markedly. This method can be applied in all recircular alloptical buffer based on SOA.