半导体光放大器亚皮秒量级超快动态特性的研究  

Theoretical study on ultrafast response of semiconductor optical amplifier

作　　者：蒋中[1] 张新亮[1] 黄德修[1] 

机构地区：[1]华中科技大学武汉光电国家实验室(筹)和光电子科学与工程学院,武汉430074

出　　处：《物理学报》2006年第9期4713-4719,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60407001);教育部新世纪优秀人才计划(批准号:NCET-04-0715)资助的课题.~~

摘　　要：通过考虑脉冲频谱的增益色散,提出了一个分析亚皮秒光脉冲在半导体光放大器(SOA)中传输的新思路.分别对超快光脉冲在时域和频域内进行离散化,建立了一个更为合理的传输数值模型.基于该模型,观察到了脉冲频谱的明显漂移,并探讨了漂移量与脉冲载波波长、脉冲能量、脉冲宽度、SOA长度和注入电流等外部条件之间的关系,从理论上解释了文献没有证实的实验结果.同时,基于交叉增益调制原理,利用双光束结构,描述了载流子加热、光谱烧孔效应和双光子吸收等非线性效应引起的增益压缩.理论分析的结果为改善SOA的动态特性提供了指导.We proposed a novel method to analyze the propagation of sub-picosecond optical pulses through semiconductor optical amplifiers（SOA）, fully considering spectral dispersion of ultrashort pulses. A reasonable model is established via sampling the pulses simultaneously in time domain and frequency domain. Based on the established model, we observed an evident shift of the pulse spectrum, which agrees well with the experiment results in literature. Further, the relationship is discussed respectively between the value of shift and several external conditions, including wavelength, energy, width of the pulse, length of SOA and injected current. Gain suppression induced by ultrafast nonlinearities including cartier heating, spectral hole burning and two- photon absorption is described in detail, employing two-beam configuration. The simulated results give good guidance to the improvement of ultrafast dynamic characteristics of SOAs.

关 键 词：半导体光放大器 超快非线性效应 增益色散性 

分 类 号：TN722[电子电信—电路与系统]