Cladding mode coupling in highly localized fiber Bragg gratings: modal properties and transmission spectra

被引：120

作者：

Thomas, Jens ^{[1
]}

Jovanovic, Nemanja ^{[2
,3
]}

Becker, Ria G. ^{[1
]}

Marshall, Graham D. ^{[2
,3
]}

Withford, Michael J. ^{[2
,3
]}

Tuennermann, Andreas ^{[1
]}

Nolte, Stefan ^{[1
]}

Steel, M. J. ^{[2
,3
]}

机构：

[1] Univ Jena, Inst Appl Phys, D-07743 Jena, Germany

[2] Macquarie Univ, MQ Photon Res Ctr, N Ryde, NSW 2109, Australia

[3] Macquarie Univ, CUDOS, Dept Phys & Astron, N Ryde, NSW 2109, Australia

来源：

OPTICS EXPRESS | 2011年 / 19卷 / 01期

关键词：

FEMTOSECOND LASER; PHASE GRATINGS; SENSORS; PULSES; MASK;

D O I：

10.1364/OE.19.000325

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The spectral characteristics of a fiber Bragg grating (FBG) with a transversely inhomogeneous refractive index profile, differs considerably from that of a transversely uniform one. Transmission spectra of inhomogeneous and asymmetric FBGs that have been inscribed with focused ultrashort pulses with the so-called point-by-point technique are investigated. The cladding mode resonances of such FBGs can span a full octave in the spectrum and are very pronounced (deeper than 20dB). Using a coupled-mode approach, we compute the strength of resonant coupling and find that coupling into cladding modes of higher azimuthal order is very sensitive to the position of the modification in the core. Exploiting these properties allows precise control of such reflections and may lead to many new sensing applications. (C) 2010 Optical Society of America

引用

页码：325 / 341

页数：17

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