Modeling and Simulation of Piecewise Regular Multimode Fiber Links Operating in a Few-Mode Regime

Abstract

This work presents an alternative model of multimode fiber links with conventional silica weakly-guiding graded-index irregular multimode fibers under a few-mode optical signal propagation generated by laser source. The proposed model is based on the piecewise regular representation. It takes into account launch conditions, differential mode delay, both lower-and higherorder mode chromatic dispersion, differential mode attenuation, and mode mixing and power diffusion occurring due to real fiber irregularity and micro-and macrobends. We present some results of introduced model approbation with following pulse propagation simulations. A close matching with measured pulse responses at the output of test fibers is noticed.

Design of Silica Multimode Optical Fibers with Extremely Enlarged Core Diameter for Laser-Based Multi-Gigabit Short-Range Optical Networks

“…Therefore, a fast and simple method for the computation of both the fundamental and higher-order mode parameters propagating in MMF is required. We propose utilizing earlier on the developed modification of a Gaussian approximation [20] that is generalized and extended [21] for the evaluation of arbitrary order-guided mode dispersion parameters propagating in a weakly guiding optical fiber, with an arbitrary axially symmetric refractive index profile in the core region, bounded by a single solid outer cladding. This extended modified Gaussian approximation (EMGA) is based on a combination of "classical" Gaussian approximation [22] and a stratification method [17] for the researched MMF complicated graded refractive index profile representation.…”

“…This extended modified Gaussian approximation (EMGA) is based on a combination of "classical" Gaussian approximation [22] and a stratification method [17] for the researched MMF complicated graded refractive index profile representation. The proposed approach permits the derivation of an analytical formula for the square core mode parameter U 2 in the form of finite nested sums [21] from a well-known integral variational expression [22]:…”

“…The last one is also described by the following analytical expression earlier on, which is derived within the Gaussian approximation approach [20,21]:…”

“…Photonics 2018, 5, 37 7 of 21 while the equivalent MFR derivative analytical expressions are also written as finite nested sums with the following form [21]:…”

“…We propose utilizing a previously developed model of a piecewise regular multimode fiber optic link operating in a few-mode regime to simulate laser-excited optical pulse propagation, and to estimate the potentiality of a 100 µm core MMF, as well as an optimized 100 µm core LDMDF for laser-based multi-gigabit data transmission. This model is described in detail in the published work [21], where its experimental verification is also demonstrated. The proposed solution is based on piecewise regular representation, combined with the general approach of the split-step method [29] to simulate the processes of mode mixing and power diffusion occurring due to mode coupling ( Figure 1).…”