Design of few-mode fibers with M-modes and low differential mode delay

Ferreira, Filipe, Fonseca, Daniel and Silva, Henrique J.A. (2014). Design of few-mode fibers with M-modes and low differential mode delay. Journal of Lightwave Technology, 32 (3), pp. 353-360.

Abstract

In this paper, we investigate the design of few-mode fibers (FMFs) guiding 2 to 12 linearly polarized (LP) modes with low differential mode delay (DMD) over the C-band, suitable for long-haul transmission. Two different types of refractive index profile have been considered: a graded-core with a cladding trench (GCCT) profile and a multi-step-index (MSI) profile. The profiles parameters are optimized in order to achieve: the lowest possible DMD and macro-bend losses (MBL) lower than the ITU-T standard recommendation. The optimization results show that the MSI profiles present lower DMD than the minimum achieved with a GCCT profile. Moreover, it is shown that the optimum DMD and the MBL scale with the number of modes for both profiles. The optimum DMD obtained for 12 LP modes is lower than 3 ps/km using a GCCT profile and lower than 2.5 ps/km using a MSI profile. The optimization results reveal that the most preponderant parameter of the GCCT profile is the refractive index relative difference at the core center, Δnco. Reducing Δn co, the DMD is reduced at the expense of increasing the MBL. Regarding the MSI profiles, it is shown that 64 steps are required to obtain a DMD improvement considering 12 LP modes. Finally, the impact of the fabrication margins on the optimum DMD is analyzed. The probability of having a manufactured FMF with 12 LP modes and DMD lower than 12 ps/km is approximately 68% using a GCCT profile and 16% using a MSI profile.

Publication DOI: https://doi.org/10.1109/JLT.2013.2293066
Divisions: Engineering & Applied Sciences
Additional Information: © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: differential mode delay,few-mode fibers,refractive index profile,Atomic and Molecular Physics, and Optics
Full Text Link: http://ieeexplo ... rnumber=6676820
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2014-02-01
Authors: Ferreira, Filipe ( 0000-0002-1533-843X)
Fonseca, Daniel
Silva, Henrique J.A.

Download

[img]

Version: Published Version


Export / Share Citation


Statistics

Additional statistics for this record