<  Retour au portail Polytechnique Montréal

Gratings with longitudinal variations in coupling coefficients: super-efficiency and unidirectionality in distributed feedback Raman fiber lasers

Amirhossein Tehranchi et Raman Kashyap

Article de revue (2020)

Document en libre accès dans PolyPublie et chez l'éditeur officiel
[img]
Affichage préliminaire
Libre accès au plein texte de ce document
Version officielle de l'éditeur
Conditions d'utilisation: Creative Commons: Attribution (CC BY)
Télécharger (1MB)
Afficher le résumé
Cacher le résumé

Abstract

We propose a technique to design highly-efficient and -unidirectional DFB Raman fiber lasers based on the engineering of the grating's coupling coefficient including a π-phase shift position in the fiber. For this purpose, first the ideal intra-cavity signal powers for different pump power levels are determined for given fiber lengths. Then, the sum and difference between the counter-propagating wave intensities at each small segment within fiber lengths are calculated resulting in determining the ideal grating's coupling functions for co- and contra-directional-pumping. The steady-state behavior of the laser using realistic parameters is finally simulated for modified coupling functions considering the Kerr nonlinearity. For a 10 W co-directional-pumped, ∼1 m long single-mode super-efficient DFB, a ∼50% increase in the laser efficiency, more than 44 dB reduction in contra-directional lasing power, ∼15 times drop in the peak power of intra-cavity signal and ∼38% decrease in the unused-pump power are found, compared to those in a standard DFB with the same coupling-length product. Although an enhanced nonlinear refractive index due to thermal gradient reduces the output power of such lasers, it is shown that the super-efficient laser presents a better performance than the standard one, under such conditions.

Mots clés

Bragg gratings; Raman lasers; fiber optic

Sujet(s): 2500 Génie électrique et électronique > 2500 Génie électrique et électronique
3100 Physique > 3100 Physique
3100 Physique > 3111 Laser
3100 Physique > 3112 Photonique
Département: Département de génie électrique
Département de génie physique
Centre de recherche: Autre
Organismes subventionnaires: CRSNG / NSERC
URL de PolyPublie: https://publications.polymtl.ca/9311/
Titre de la revue: New Journal of Physics (vol. 22, no 10)
Maison d'édition: IOP Publishing Ltd
DOI: 10.1088/1367-2630/abbc2a
URL officielle: https://doi.org/10.1088/1367-2630/abbc2a
Date du dépôt: 14 août 2023 17:23
Dernière modification: 26 sept. 2024 11:35
Citer en APA 7: Tehranchi, A., & Kashyap, R. (2020). Gratings with longitudinal variations in coupling coefficients: super-efficiency and unidirectionality in distributed feedback Raman fiber lasers. New Journal of Physics, 22(10), 103022 (10 pages). https://doi.org/10.1088/1367-2630/abbc2a

Statistiques

Total des téléchargements à partir de PolyPublie

Téléchargements par année

Provenance des téléchargements

Dimensions

Actions réservées au personnel

Afficher document Afficher document