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Proceedings Paper

Multi-wavelength switchable fibre ring laser based on polarisation selective tilted fibre gratings capable of strain and temperature sensing
Author(s): Pouneh Saffari; Chengbo Mou; Hongyan Fu; Lin Zhang; Ian Bennion
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Paper Abstract

Using three fibre gratings with excessively tilted structures in the cavity, we have experimentally demonstrated a multiwavelength switchable erbium-doped fibre ring laser system. The three tilted gratings act as in-fibre polariser and polarisation dependent loss filters to induce the polarisation hole burning effect in the cavity for the operation of the laser at single, double, triple and quadruple wavelengths. The laser system has demonstrated good stability under room temperature conditions and also achieved a high degree of polarization (~30dB), high optical signal to noise ratio (up to 63dB) and high side mode suppression (~50dB). The system has also been investigated for temperature and strain sensing by subjecting the seeding fibre Bragg gratings (FBG) to temperature and strain variations. Since the loss band of the polarisation dependent loss filter is broader than the bandwidth of the seeding FBG, the laser output shifts in wavelength with the applied temperature and strain. The fibre ring laser has shown good responses to the temperature and strain, providing sensitivities of approximately 11.7 pm/°C and 0.85pm/με respectively.

Paper Details

Date Published: 18 May 2009
PDF: 10 pages
Proc. SPIE 7356, Optical Sensors 2009, 73561S (18 May 2009); doi: 10.1117/12.820659
Show Author Affiliations
Pouneh Saffari, Aston Univ. (United Kingdom)
Chengbo Mou, Aston Univ. (United Kingdom)
Hongyan Fu, Zhejiang Univ. (China)
Lin Zhang, Aston Univ. (United Kingdom)
Ian Bennion, Aston Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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