功率均衡对于双环全光缓存器中双波长信号的质量改善

The quality improvement of the dual-wavelength signals in DLOB by power equalization

信号在双环全光缓存器中进行缓存,是利用信号光和控制光在SOA中进行交叉相位调制来实现的。而对两个波长信号同时进行缓存将存在相位和增益不均衡问题,从而影响了输出信号的质量。本文提出了一种利用SOA的饱和特性对双波长信号进行功率均衡,而后写入缓存器的方法,使不同峰值功率信号获得相同的增益和相位调制,从而改善输出信号的质量。实验得到了速率为2.5Gb/s的NRZ码数据包缓存16圈的结果,信号缓存时间达到16.5με。输出信号的消光比为8dB,信噪比8.1dB.

The data packet buffering can be implemented in dual loop optical buffer （DLOB） due to the effect of cross-phase modulation （XPM） between the control signal and the data packets. But the output quality of dual wavelength signals will decrease because of the unbalanced gain and phaze shift. The problem can be resolved by power equalization using the setu ration character of SOA. The data packets with 2.5 Gb/s can be buffered in DLOB for 16 cycles eorresponding to 16.5μg. The extinction ratio of the output packet is 8 dB while the S/N is 8. 1 dB.