Design of Few-Mode Fibers with Arbitrary and Flattened Differential Mode Delay
Ferreira, F. M.
; Fonseca, D.
; Silva, H. A.
IEEE Photonics Technology Letters Vol. 25, Nº 5, pp. 438 - 441, March, 2013.
ISSN (print): 1041-1135
ISSN (online): 1941-0174
Scimago Journal Ranking: 1,50 (in 2013)
Digital Object Identifier: 10.1109/LPT.2013.2241047
Abstract
This letter proposes the use of a refractive index profile with a graded core and a cladding trench for the design of few-mode fibers (FMFs), aiming an arbitrary differential mode delay (DMD) flattened over the C+L band. By optimizing the core grading exponent and the dimensioning of the trench, a deviation lower than 0.01 ps/km from a target DMD is observed over the investigated wavelength range. Additionally, it has been found that the dimensioning of the trench is almost independent of the target DMD, thereby enabling the use of a simple design rule which guarantees a maximum DMD deviation of 1.8 ps/km for a DMD target between 200 ps/km to 200 ps/km.
