Fabrication and characterisation of FBG sensors in low loss polymer optical fibre

Amédée Lacraz; Andreas Theodosiou; Michalis Polis; Kyriacos Kalli

doi:10.1117/12.2236834

30 May 2016 Fabrication and characterisation of FBG sensors in low loss polymer optical fibre

Amédée Lacraz, Andreas Theodosiou, Michalis Polis, Kyriacos Kalli

Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 991620 (2016) https://doi.org/10.1117/12.2236834
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

In this paper, we report on an effective way to locally alter the refractive index of a low-loss polymer optical fibre (POF), in order to fabricate novel fibre optical sensors. Such refractive index modifications, if reproduced periodically, create fibre Bragg gratings (FBGs) that find diverse applications in telecommunications and sensing. With a femtosecond laser set-up, we were able to inscribe refractive index changes in the core of the fibre on an area as small as a μm². This technique can be effectively used to produce FBGs with a tailored length and strength and, so, with desired optical properties. The fibre used was a large core, graded index, multimode perfluorinated fibre. FBGs resonate at different wavelengths depending on the mode distribution in multimode fibres, because the effective refractive index depends on the spatial distribution of the light inside the core. Therefore, the reflection spectrum from the grating degenerates into multiple resonances, each associated with a different mode. The detection of the reflected modes was performed with a custom made software that was able to track a specific reflected mode even when the FBG underwent perturbation, such as temperature or strain changes. Moreover, a key advantage of low-loss fibre is the possibility to use long lengths of fibre and to be able to inscribe several FBGs in a single piece of fibre. With our detection system, we managed to track the perturbation of individual FBGs in a fibre array of multiple gratings. The combination of our femtosecond inscription setup and a mode detection system is encouraging for the development of low loss POF sensing devices.

Citation Download Citation

Amédée Lacraz, Andreas Theodosiou, Michalis Polis, and Kyriacos Kalli "Fabrication and characterisation of FBG sensors in low loss polymer optical fibre", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991620 (30 May 2016); https://doi.org/10.1117/12.2236834

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
4 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Fiber Bragg gratings

Polymers

Phase only filters

Polymeric sensors

Refractive index

Femtosecond phenomena

Optical fibers

Show All Keywords

Keywords/Phrases

Search In:

Publication Years