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Comptes Rendus Chimie
Volume 5, n° 12
pages 815-824 (décembre 2002)
Doi : S1631-0748(02)01449-2
Received : 30 April 2002 ;  accepted : 28 May 2002
Rare-earth-doped glasses for fiber amplifiers in broadband telecommunication
 

Setsuhisa Tanabe
Faculty of Integrated Studies, Kyoto University, Kyoto 606-8501, Japan 

*Correspondence and reprints
Abstract

Rare-earth-doped optical amplifiers have a great potential for broadband Wavelength-Division-Multiplexed (WDM) telecommunication by tailoring host glass compositions. In order to design the emission spectra of doped rare-earth ions, it is important to understand the relationship between the local ligand field and various optical properties of specific 4f-levels, such as the radiative transition probability, the nonradiative decay probability, which dominate the spectral line width and quantum efficiency of amplification transitions. For the Er3+:1.55 μm transition, the role of the Judd-Ofelt Ω 6 parameters is presented, which is correlated to the Er-ligand bond covalency in glasses. The Tm3+: 1.46-μm transition shows quantum efficiency over 90% high enough for the S-band application, in heavy metal oxide glasses with moderate phonon energy and wider spectra than fluorides. A way to improve population inversion by selective energy transfer with codoped lanthanide ions is presented. Finally, the energy level structures and resultant spectral properties of Pr3+, Nd3+ and Dy3+ ions, 1.3-μm-active ions, are compared. The hypersensitivity of Dy3+ transitions appears especially in chalcogenide glasses, where the nonradiative loss due to multiphonon decay is also minimized. In conclusion, glass materials have opportunities to vary the radiative cross section, quantum efficiency, and gain flatness, which are important for novel amplifiers in the future DWDM system.

The full text of this article is available in PDF format.
Résumé

Les télécommunications à large bande basées sur le multiplexage en division de longueur d'onde (WDM) font appel à des amplificateurs optiques dopés avec des terres rares. Le spectre d'émission de ces terres rares peut être ajusté en modifiant la composition du verre. Il faut pour cela connaître la relation entre le champ local et les caractéristiques optiques des niveaux concernés, en particulier les probabilités de transition radiative et de désexcitation non radiative, qui déterminent la largeur spectrale et le rendement quantique des transitions. Le rôle du paramètre de Judd-Ofeld Ω 6 dans la transition de l'erbium à 1,55 μm est corrélé à la covalence de la liaison Er-ligande dans le verre. Les transitions du Tm3+ pour la bande S et celle des ions Pr3+, Nd3+ et Dy3+ à 1,3 μm sont également abordées et discutées. Dans les matériaux vitreux, on peut ainsi faire varier la section efficace radiative, le rendement quantique et la constance du gain, ce qui peut se révéler important pour les nouveaux amplificateurs dans les futurs systèmes DWDM.

The full text of this article is available in PDF format.

Keywords : rare earths, glass, optical amplifier, telecommunication, Wavelength-Division Multiplexing, optical fiber

Mots-clé : terres rares, verre, amplificateur optique, télécommunication, Wavelength-Division Multiplexing (WDM), fibre optique




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