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Erbium Ring Fiber Laser Cavity Based on Tip Modal Interferometer and Its Tunable Multi-Wavelength Response for Refractive Index and Temperature
Yanelis Lopez-Dieguez, 1 Julian M. Estudillo-Ayala 1 , Daniel Jauregui-Vazquez 1 , Luis A. Herrera-Piad 1 , Juan M. Sierra-Hernandez, 1 Diego F. Garcia-Mina 2 , Eloisa Gallegos-Arellano 3 , Juan C. Hernandez-Garcia, 1 Roberto Rojas-Laguna 1
1  Departamento de Electrónica, División de Ingenierías Campus Irapuato-Salamanca, Universidad de Guanajuato, Carretera Salamanca-Valle de Santiago km 3.5 + 1.8 km, Salamanca Gto. 36885, Mexico
2  Departamento de Física, Facultad de Ciencias Básicas, Universidad Autónoma de Occidente, Calle 25 # 115-85, Cali 760030, Colombia
3  Departamento de Tecnologías de la Información y Comunicación, Universidad Tecnológica de Salamanca, Avenida Universidad Tecnológica 200, Ciudad Bajío, Salamanca Gto. 36766, Mexico

Published: 10 August 2018 by MDPI in Applied Sciences
MDPI, Volume 8; 10.3390/app8081337
Abstract: A tunable multi-wavelength fiber laser is proposed and demonstrated based on two main elements: an erbium-doped fiber ring cavity and compact intermodal fiber structure. The modal fiber interferometer is fabricated using the cost-effective arc splice technique between conventional single-mode fiber and microfiber. This optical fiber structure acts as a wavelength filter, operated in reflection mode. When the refractive index and temperature variations are applied over the fiber filter, the ring laser cavity provides several quad-wavelength laser spectra. The multi-wavelength spectra are tuned into the C-band with a resolution of 0.05 nm. In addition, the spectra are symmetric with minimal power difference between the lasing modes involved, and the average of the side mode suppression ratio is close to 37 dB. This laser offers low-cost implementation, low wavelength drift, and high power stability, as well as an effect of easy controllability regarding tuned multi-wavelength.
Keywords: fiber laser, Ring Laser Cavity, tunable multi-wavelength laser
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