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Extension de la representation scalaire du champ aux fibres optiques à gaine finie

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Résumé

Le concept de mode LP introduit dans la théorie du guidage faible est étendu aux fibres optiques à gaine finie, pour les modes de gaine dont l'indice effectif reste voisin de l'indice de la gaine. Une étude plus précise montre ensuite comment les modes LPmn dégénérés se scindent en modes HEm+1, n et EHm−1, n non dégénérés. On indique comment écrire la condition aux limites sur l'interface fibre/air pour la fonction scalaire qui décrit le champ; à l'ordre 0 (modes LP), il suffit d'annuler cette fonction.

Abstract

The LP mode concept, which was introduced in the weak guiding theory is extended to optical fibers with finite cladding, for cladding modes the effective index of which remains close to the cladding refractive index. A more accurate study shows how the degenerate LPmn modes split into nondegenerate HEm+1, n and EHm−1, n modes. The boundary condition to be satisfied by the scalar field on the air/fibre interface is derived; for zeroth order (LP modes), this scalar field must be zero on this interface.

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Authors and Affiliations

  1. Centre National d'Etudes des Télécommunications, BP 40 - 22301, Lannion, France

    C. Vassallo

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  1. C. Vassallo
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Vassallo, C. Extension de la representation scalaire du champ aux fibres optiques à gaine finie. Opt Quant Electron 15, 349–353 (1983). https://doi.org/10.1007/BF00619903

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  • DOI: https://doi.org/10.1007/BF00619903

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