Brillouin fiber lasers and their applications in fiber sensing

5^th International Conference and Exhibition on Lasers, Optics & Photonics

November 28-30, 2016 Atlanta, USA

Junqiang Sun

Huazhong University of Science and Technology, China

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

Several fiber lasers based on stimulated Brillouin scattering are reported including multi-wavelength lasers, single longitudinalmode multi-wavelength lasers and short-cavity length single longitudinal-mode lasers. A hybrid multimode fiber laser is proposed to realize simultaneous measurement of strain and temperature based on radio-frequency demodulation. The hybrid lasers include a Brillouin erbium fiber laser (BEFL) with dual Brillouin peaks and an erbium-doped fiber laser (EDFL), which is incorporated in a simple and compact ring laser cavity. The injection of Brillouin pump excites first-order stimulated Brillouin scattering in two sections of fibers with different Brillouin stokes frequencies. The simultaneous measurement of strain and temperature are achieved by monitoring the self-beating signals of the BEFL and EDFL. The maximum measurement errors of strain and temperature obtained are within �±20.3 �¼�µ and �±0.5�ºC. Simultaneous temperature and strain measurement is demonstrated by using hybrid EDF/Brillouin lasers. The EDFL can be switched to BEFL by injecting the Brillouin pump into the laser cavity. Longitudinal mode beat frequency and Brillouin frequency shift are monitored to discriminate strain and temperature. The longitudinal modes beat frequency is measured by observing the self-beating signals of the EDFL, while the Brillouin frequency shift is measured by monitoring the heterodyning signal of the BEFL. The simultaneous measurement errors of strain and temperature are within �± 25.8 �¼�µ and �± 0.8�ºC.

Biography :

Email: jqsun@mail.hust.edu.cn