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

Abstract

This work presents an alternative fast and simple method for the design of a refractive index profile of silica multimode optical fibers (MMFs) with extremely enlarged core diameters of up to 100 µm for laser-based multi-gigabit short-range optical networks. We demonstrate some results of 100 µm core MMF graded index profile optimization performed by a proposed solution, which provides a selected mode staff differential mode delay (DMD) reduction over the “O”-band under particular launching conditions. Earlier on, a developed alternative model for a piecewise regular multimode fiber optic link operating in a few-mode regime for the computation of laser-excited optical pulse dynamics during its propagation over an irregular silica graded-index MMF with an extremely large core diameter, is utilized to estimate the potentiality of fiber optic links with the described MMFs. Here, we also present the comparison results of the simulation of 10GBase-LX optical signal transmission over 100 µm core MMFs with conventional and optimized graded-index refractive index profiles.

New Silica Laser-Optimized Multimode Optical Fibers with Extremely Enlarged 100-μm Core Diameter for Gigabit Onboard and Industrial Networks

“…Unlike known solutions (detailed overview is presented in the earlier on published papers [10][11][12] and monograph [13]), we proposed to take into account the following outlined factors during the design refractive index profile for LOMF with extremely large core diameter [10][11][12]:…”

“…Proposed method for design of special graded refractive index profile, providing of selected guided mode delay equalization around some reference mode delay value t REF , is described in details in the earlier on published papers [10][11][12]. We consider typical silica optical fiber geometry containing fused silica core doped by Germanium and Fluorine bounded by single pure fused silica outer solid cladding.…”

“…During objective function (1) minimization, a direct problem of analysis of optical fiber with current refractive index profile should be solved at the each optimization iteration. For this purpose, we utilize earlier on developed modified [15] Gaussian approximation [16], extended for analysis and computation of arbitrary order guided mode transmission parameters in weakly guiding optical fibers with arbitrary axially symmetrical refractive index profile [15,17,18] (EMGA-Extended Modified Gaussian Approximation), under the following corresponding modification for 100-µm core, which is described in detail in the publications mentioned above [10][11][12].…”

“…100 Mbps) networks with fiber optic systems, based on multimode light emitting diodes (LEDs) transceivers, e.g., they are suitable only for multimode regime of data transmission. In the earlier on published works [10][11][12], we presented an alternative fast and simple method for the design of special graded refractive index profile of large core silica LOMFs. Here, we demonstrated some results of profile optimization performed for 100-µm core LOMF by proposed solution.…”

“…These samples of designed graded refractive index profiles were targeted on differential mode delay (DMD) decreasing for selected guided modes over the "O"-band under particular launching conditions. This work presents manufactured new type of silica LOMF 100/125-with extremely enlarged core diameter up to 100 µm and "typical" "telecommunication" cladding diameter 125 µm and low DMD, provided by earlier on developed samples of special optimized graded refractive index profiles [10][11][12]. We demonstrate some results of tests, performed for manufactured pilot 520 m length of described LOMF 100/125, concerned with its geometry properties as well as key transmission parameters-attenuation and DMD map.…”