Open AccessMode switching using optically induced long-period gratings: a theoretical analysis
Author(s) -
Gil M. Fernandes,
Adriana Rocha,
Margarida Facão
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.421798
Subject(s) - optics , four wave mixing , physics , wavelength , bandwidth (computing) , multiplexing , wavelength division multiplexing , coupled mode theory , grating , multi mode optical fiber , nonlinear optics , optical fiber , telecommunications , refractive index , computer science , laser
We show that optically induced long-period grating (OLPG) is a particular case of inter-modal Bragg-scattering four-wave mixing (BS-FWM). To carry out such analysis, a vector model for the inter-modal BS-FWM was proposed and further tailored to investigate the energy transfer induced by OLPGs. Both processes, BS-FWM and OLPGs, have been proposed for in-line all-optical mode switching in transmission systems with space-division multiplexing (SDM). In this scope, we demonstrate that the bandwidth of OLPGs is larger than the BS-FWM. Furthermore, we show that OLPG-based mode switching can take place in two windows, if both pump beams are launched near the zero value of the differential mode-group delay, and the central wavelength and the bandwidth of such windows can be tuned by properly adjusting the wavelength and the optical power of the pump beams.