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中文摘要：
研究了基于“保持光”（holding beam）注入（HBI）改善半导体光放大器（SOA）自偏振旋转（SPR）性能的方法。HBI虽然降低了SOA的偏振模式增益，但是缩短了对TE和TM模式的增益恢复时间，从而加速了SOA器SPR特性对超快信号的响应。以基于SOA的SPR特性的光功率均衡为例，我们发现，HBI可以明显抑制和消除载流子恢复时间过长导致的归零码（Rz）波形畸变和非归零码（NRZ）过冲现象。光功率均衡后，RZ信号消光比可提高8～10dB、NRZ信号消光比可提高4～6dB，两种信号的眼图Q因子均可达20以上。
英文摘要：
Performance improvement of self-induced polarization rotation （SPR） in a semiconductor optical amplifier （SOA） is proposed based on holding beam iniection （HBI）. Simulation results show that the holding beam injection can dramatically reduce the gain recovery time of TE and TM modes, and speed up the response of SPR in the SOA for the ultra fast signal, though the gains of TE and TM modes are also reduced. As an example of validation, the proposed method is applied in the SPR-based optical power equalization. It is observed that both the distortion of return-to-zero （RZ） signal and the overshoot of non-return-to-zero （NRZ） signal due to the slow gain recovery of the SOA can be significantly suppressed. After the power equalization, the extension ratio （ER） of the output signal can be increased by 8 --10 dB for RZ signal and 4--6 dB for NRZ signal respectively,and both signals reach high quality with the Q factor of eye-diagram over 20.
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