Low thermal sensitivity grating devices based on ex-45° tilting structure capable of forward-propagating cladding modes coupling

Zhou, Kaiming, Zhang, Lin, Chen, Xianfeng F. and Bennion, Ian (2006). Low thermal sensitivity grating devices based on ex-45° tilting structure capable of forward-propagating cladding modes coupling. Journal of lightwave technology, 24 (12), pp. 5087-5094.

Abstract

The authors describe a detailed investigation on tilted fiber Bragg grating (TFBG) structures with tilted angles exceeding 45°. In contrast to the backward mode coupling mechanism of Bragg gratings with normal and small tilting structures, the ex-45° TFBGs facilitate the light coupling to the forward-propagating cladding modes. The authors have also theoretically and experimentally examined the mode coupling transition of TFBGs with small, medium, and large tilt angles. In particular, experiments are conducted to investigate the spectra and far-field distribution, as well as temperature, strain, and refractive-index sensitivities of ex-45° devices. It has been revealed that these ex-45° gratings exhibit ultralow thermal sensitivity. As in-fiber devices, they may be superior to conventional Bragg and long-period gratings when the low thermal cross sensitivity is required.

Publication DOI: https://doi.org/10.1109/JLT.2006.884985
Divisions: Engineering & Applied Sciences > Electrical, electronic & power engineering
Additional Information: © 2006 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Uncontrolled Keywords: biomedical optical imaging, Bragg gratings, capacitive sensors, fiber gratings, optical coupling, optical fiber polarization, optical filters, optical refraction, optical sensors, temperature sensors, optical fibre cladding, optical fibre couplers, refractive index, cladding modes coupling, fiber Bragg grating, refractive-index sensitivity, thermal sensitivity, tilted angles, coupled mode analysis optical biosensors, FBGs, optical fiber radiation effects
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Published Date: 2006-12
Authors: Zhou, Kaiming
Zhang, Lin
Chen, Xianfeng F.
Bennion, Ian

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