Investigation on gain characteristics in non-degenerate cascaded phase sensitive parametric amplifiers

We theoretically and experimentally show the impact of the ratio between the signal and idler generated from the PIA part on the gain characteristics in the continuous wave (CW) pump non-degenerate cascaded phase-sensitive fiber optical parametric amplifier (PS-FOPA). The results show that the length of highly nonlinear fiber (HNLF) used for generating the idler can cause the variation of power ratio between the idler and signal, which significantly affects the gain characteristics of the PS-FOPA under the small signal gain condition. To obtain high gain, it is better to choose long HNLF to generate idler. In our experiment, 5.5 dB gain and 18 nm bandwidth (on/off gain>10 dBm) in PS-FOPA can be achieved when 300 m-long HNLF instead of 200 m-long HNLF is used in PIA.     

半导体光放大器全光波长转换的理论研究

根据半导体光放大器中载流子密度变化与光场强度变化的速率方程,利用半导体光放大器实现波长变换的理论模型,并且数值计算了各种入射波(方波、锯齿波、三角波、高斯波)调制情况下模型的响应状况。数值计算的结果表明,半导体光放大器在全光波长转换中具有很好的线性响应特性和较高的转换速率。     

光开关在自动交换光网络中的研究与检测技术

作为自动交换光网络中的核心器件。光开关将在未来全光网中发挥着重要作用，并成为未来光联网的关键技术．本文总结光开关实现方法的最新进展，重点介绍电光效应开关和超高速光控开关的工作原理和实际应用．最后阐述我实验室在光开关性能检测方面所做的研究工作．