基于优化纵模间隔的布里渊散射慢光的研究

Study of Brillouin scattering slow light based on optimized longitudinal mode spacing

理论分析了多纵模布里渊(Brillouin)泵浦慢光的纵模间隔对信号增益与延迟的影响,结合信号的展宽特性,发现当纵模间隔与本征布里渊谱宽的比值小于0.3时,信号增益与延迟的波动可以忽略。提出并验证了基于半导体光放大器(SOA)的宽带多纵模布里渊泵浦慢光的方法,输出布里渊泵浦源的带宽与SOA偏置电流的斜率约为6.8MHz/mA,当环形腔中的损耗值为8dB、且偏置电流为120mA时,获得了11.5GHz宽带的泵浦源,其纵模间隔为6MHz。利用8Gbit/s的高速信号,在布里渊增益为4dB时,获得了130.0ps的延迟。

The effects of mode spacing of multiple longitudinal modes BrilIouin pump slow light on gain and delay are analyzed theoretically. Through the analysis of Brillouin gain, delay and signal broadening affected by the mode spacing, the fluctuation of the gain and delay can be ignored when the ratio between mode spacing and intrinsic Brillouin spectral width is less than 0. 3. The multiple longitudinal modes pump with optimized mode spacing is obtained by using semiconductor optical amplifier （SOA）. The ratio between laser bandwidth and bias of SOA is about 6.8 MHz/mA,the 3 riB-bandwidth is about 11.5 GHz when the loss of the variable optical attenuator is 8 dB and bias of SOA is 120 mA,and the spectrum of the pump is composed of a large number of longitudinal modes separated by 6 MHz. The delay of 8 Gbit/s signal is about 130.0 ps at 4 dB Brillouin gain.