Multimode fibers (MMF) are enjoying a renewed attention boosted by recent advances in multimode complex nonlinear optics. Reason behind nonlinearity is occurred either due to intensity dependence of the medium refractive index or to inelastic-scattering phenomenon. The most commonly occurred non-linear effects in optical Multiple Input Multiple Output (O-MIMO) are the Kerr, Stimulated Brillouin Scattering (SBS) and Stimulated Raman Scattering (SRS) effects. The impact of Kerr, SBS and SRS instigate distortions to the optical signal transmission over MIMO transmission system. In this work, we focus on the impact of the optical Kerr, SBS and SRS effects on the overall performance of a MIMO transmission system. It is observed that in O-MIMO system, nonlinear effects degrade the system performance since many channels propagate simultaneously. They can result in pulse distortion and crosstalk between channels. Here, a comparative study between MIMO communication system with and without nonlinearities allows an accurate performance evaluation. The comparison is performed using Q-factor and Bit Error Rate (BER). The outcome is analyzed using OptiSystem software tool.

由于多模复杂非线性光学的最新进展，多模光纤（MMF）受到了新的关注。非线性背后的原因是由于介质折射率的强度依赖性或非弹性散射现象引起的。光学多输入多输出（O-MIMO）中最常见的非线性效应是Kerr，受激布里渊散射（SBS）和受激拉曼散射（SRS）效应。Kerr，SBS和SRS的影响会导致失真对MIMO传输系统上的光信号传输。在这项工作中，我们重点研究光学Kerr，SBS和SRS效应对MIMO传输系统整体性能的影响。可以看出，在O-MIMO系统中，非线性效应会降低系统性能，因为许多信道会同时传播。它们会导致脉冲失真和通道之间的串扰。在此，通过对带有和不带有非线性的MIMO通信系统之间的比较研究，可以进行准确的性能评估。使用Q因子和误码率（BER）进行比较。使用OptiSystem软件工具分析结果。