基于高非线性光纤和SOA非线性效应的星上再生波长变换

A regenerative wavelength conversion scheme on satellite based on HNLF and nonlinearity of SOA

针对分布式卫星系统信息交换频繁、波长变换频次高且由此导致信号损伤严重的特点,提出了一种基于高非线性光纤(HNLF)和半导体光放大器(SOA)非线性效应的星上全光再生波长变换方案。利用HNLF的自相位调制(SPM)效应对原始信号频谱进行展宽,通过红移或蓝移滤波取出预变换信号,分别作为波长上变换或下变换的泵浦光信号,最后基于SOA的四波混频(FWM)效应实现了对原始信号的波长变换。理论推导了波长变换方案的工作原理,分析了波长变换性能与各结构参数之间的关系。仿真实验结果表明:本文方案在有效实现波长变换的同时能够一定程度地改善信号质量,Q因子改善最高可达3dB以上,功率转换效率可达到20dB。

Aiming at the charactoristics of distributed satellites system that the information exchanging and wavelength conversion are frequent and subsequently the injury of signal is serious,a regenerative wavelength conversion scheme on satellite based on HNLF and nonlinearity of semiconductor optical amplifier（SOA）is put forward.Making use of the self-phase modulation（SPM）in high nonlinear fiber（HNLF）to broaden the spectrum of initial signals,apre-conversion signal is obtained as the pump laser for wavelength up or down conversion respectively through a red-shifted filter or a blue-shifted filter.Finally,the wavelength coversion is realized based on the four-wave mixing（FWM）in SOA.The principle of the scheme is deduced theoretically,and the relationship between conversion performance and structural parameters is analyzed.The simulation results show that the scheme can improve the quality of signals to some extent when completing a wavelength conversion,Qfactor improvement can be 3dB at most,and at the same time the conversion efficiency can reach 20 dB.