Influence in cladding mode distribution of overlay deposition on long-period fiber gratings
Fecha
2006Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión aceptada / Onetsi den bertsioa
Impacto
|
10.1364/JOSAA.23.000651
Resumen
A thin overlay of higher refractive index than that of the cladding of a long-period fiber grating induces in
cladding modes strong variations in effective index, mode profile, cross-coupling coefficient with the core mode,
and self-coupling coefficient. Some conditions must be met in order to obtain the highest inducement. The key
parameters are the thickness and the refractive index of the o ...
[++]
A thin overlay of higher refractive index than that of the cladding of a long-period fiber grating induces in
cladding modes strong variations in effective index, mode profile, cross-coupling coefficient with the core mode,
and self-coupling coefficient. Some conditions must be met in order to obtain the highest inducement. The key
parameters are the thickness and the refractive index of the overlay, and the ambient refractive index. Under
optimum conditions, the sensitivity of the device to variations in any of the critical parameters is improved in
a great manner. The result is large shifts of the attenuation bands in the transmission spectrum. If the refractive
index of the overlay is complex, there is an additional phenomenon of vanishing of the attenuation bands
in the transmission spectrum. This occurs for specific thickness values of the overlay. The problem is solved in
two steps: a vectorial analysis of the modes and the application of coupled-mode theory [--]
Materias
Long period fiber Bragg gratings,
Optical fiber sensors,
Thin-films,
Coupled-mode theory
Editor
Optical Society of America
Publicado en
Journal of the Optical Society of America A Vol. 23, Issue 3, pp. 651-658 (2006)
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila
Versión del editor
Entidades Financiadoras
This work was supported by Spanish Ministerio de Cien-
cia y Tecnología and Fondo Europeo de Desarrollo Re-
gional research grants CICYT-TIC 2003-00909, Gobierno
de Navarra, and a Formacion de Profesorado Universi-
tario Ministerio de Educación Cultura y Deporte grant.