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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 effect of slow mode longitudinal mode spacing of multi-longitudinal mode Brillouin pumping on signal gain and delay is theoretically analyzed. Combined with the signal broadening characteristics, it is found that when the ratio of longitudinal mode spacing to intrinsic Brillouin spectral width is less than 0.3, the fluctuation of signal gain and delay can be neglected. A method based on semiconductor multi-longitudinal mode Brillouin pumping slow light based on semiconductor optical amplifier (SOA) is proposed and validated. The slope of output bandwidth of Brillouin pump source and SOA bias current is about 6.8MHz / mA. A loss of 8dB in the toroidal cavity and a 120mA bias current resulted in a 11.5GHz wideband pump source with a vertical mode spacing of 6MHz. Using a 8 Gbit / s high-speed signal, a 130.0 ps delay is obtained at a Brillouin gain of 4 dB.