Analytical formula of nonlinear interference in few-mode fibers in strong coupling regime

Abdallah A I Ali,Abdulaziz E El-Fiqi,Rameash K Pokharel,Ziad A El-Sahn,Hossam M H Shalaby

doi:10.1109/icton.2015.7193620

Abdallah A I Ali, Abdulaziz E El-Fiqi + Show 3 more

Open Access

https://doi.org/10.1109/icton.2015.7193620

Copy DOI

Abstract

We derive a closed-form formula for the nonlinear interference in few-mode fibers (FMFs) in strong coupling regime. We also formulate an expression for the nonlinear FMFs capacity. This is carried out by extending the Gaussian noise model (GN-model), that has been used with single-mode fibers (SMFs), to FMFs. We inspect the derived formulas over a mode-division multiplexing (MDM) system that carries wavelength-division multiplexed (WDM) signals on each polarization of every spatial mode. The nonlinear coupling among three co-propagated modes reduces the average optical signal-to-noise ratio (OSNR) by about 11.5 dB when compared to single-mode propagation. Also, a differential mode group delay (DMGD) of 300 ps/km between the fundamental mode LP 01 and the other two modes Lp 11a(b) reduces the nonlinearity penalty by about 10%.

Full Text