基于中距相位共轭及色散管理的信道内四波混频补偿  

Intrachannel Four-Wave Mixing Compensation in Dispersion-Managed Transmission Links with Mid-Span Optical Phase Conjugation

作　　者：曹文华 Cao Wenhua(College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China)

机构地区：[1]深圳大学电子与信息工程学院,广东深圳518060

出　　处：《光学学报》2023年第5期51-60,共10页Acta Optica Sinica

基　　金：深圳市科技计划项目(JCYJ20190808115601653)。

摘　　要：基于中距相位共轭(OPC)结合色散管理的光纤非线性补偿方案,可满足OPC的传输对称性,改善非线性补偿效果,但是该方案用到了大量的反向色散光纤(IDF),不仅不便于对现有线路的升级改造,而且IDF尚未形成量产。采用色散补偿光纤(DCF)代替上述方案中的IDF,对两种方案(分别称为IDF方案和DCF方案)的非线性补偿性能进行了比较,详细考察了两种方案对信道内四波混频(IFWM)的补偿。通过数值计算发现,如果在DCF方案中采取非对称功率传输,则可获得接近于IDF方案的理想补偿效果。Objective Mid-span optical phase conjugation(OPC)is a viable option for nonlinearity compensation in high-speed fiber-optic transmission systems.However,propagation symmetry is a key factor in the good performance of OPC.In other words,nonlinearity compensation is effective when the transmission link is symmetric with respect to OPC in terms of optical power and accumulated dispersion,which is the metric of OPC effectiveness,called the power versus accumulated dispersion diagram(PADD).Due to fiber loss,symmetric PADD cannot be obtained in common transmission systems based on the erbium-doped fiber amplifier(EDFA).Recently,a novel approach to satisfying the nonlinearity compensation criteria has been proposed,where symmetric PADD is obtained through optimized dispersion management with the inverse dispersion fiber(IDF).However,the approach relies on the availability of IDF which does exist,and IDF is not mass-produced.This paper numerically investigates the possibility of using the dispersion-compensating fiber(DCF)instead of IDF for link construction,which allows for a relatively simple modification and upgrades of installed fiber-optic links.Methods Numerical simulations are performed by the use of the split-step Fourier method,and pulse evolution in the fibers is described by the generalized nonlinear Schrödinger equation,which includes intrachannel nonlinearities such as self-phase modulation(SPM),intrachannel cross-phase modulation(IXPM),and intrachannel four-wave mixing(IFWM).The performance of two links(for simplicity,called IDF-managed link and DCF-managed link,as shown in Fig.1)is compared with respect to the IFWM-induced peak intensity fluctuation at the"1"bits and ghost pulse generation at the"0"bits.The links are made of three types of fibers with parameters near 1.55μm,as listed in Table 1.In the IDF-managed link,the standard single-mode fiber(SSMF)and the IDF have the same length,same loss,and same nonlinearity except for the reversed group velocity dispersion(GVD).Whereas in the DCF-managed link,t

关 键 词：光纤光学 光学相位共轭 色散管理 色散补偿光纤 反向色散光纤 信道内四波混频 非线性补偿 

分 类 号：TN913.7[电子电信—通信与信息系统]