Multi-Wavelength Q-Switched Erbium-Doped Fiber Laser with Photonic Crystal Fiber and Multi-Walled Carbon Nanotubes

Authors: Zian Cheak Tiu, Harith Ahmad, Sulaiman Wadi Harun

Abstract:

A simple multi-wavelength passively Q-switched Erbium-doped fiber laser (EDFL) is demonstrated using low cost multi-walled carbon nanotubes (MWCNTs) based saturable absorber (SA), which is prepared using polyvinyl alcohol (PVA) as a host polymer. The multi-wavelength operation is achieved based on nonlinear polarization rotation (NPR) effect by incorporating 50 m long photonic crystal fiber (PCF) in the ring cavity. The EDFL produces a stable multi-wavelength comb spectrum for more than 14 lines with a fixed spacing of 0.48 nm. The laser also demonstrates a stable pulse train with the repetition rate increases from 14.9 kHz to 25.4 kHz as the pump power increases from the threshold power of 69.0 mW to the maximum pump power of 133.8 mW. The minimum pulse width of 4.4 μs was obtained at the maximum pump power of 133.8 mW while the highest energy of 0.74 nJ was obtained at pump power of 69.0 mW.

Keywords: Multi-wavelength, Q-switched, multi-wall carbon nanotube, photonic crystal fiber.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1096163

References:

[1] S. Xiao, et al, "Realization of multiwavelength label optical packet switching,” Photonics Technology Letters, vol. 15, pp. 605–607, 2003.
[2] D. R. Chen, et al, "Wavelength-spacing continuously tunable multi-wavelength SOA-fiber ring laser based on Mach-Zehnder interferometer,” Optics & Laser Technology, vol. 40, pp. 278–281, 2008.
[3] S. Shahi, et al, "Multi-wavelength generation using a bismuth-based EDF and Brillouin effect in a linear cavity configuration,” Optics & Laser Technology, vol. 41, pp. 198–201, 2009.
[4] R. Parvizi, et al, "Multi-wavelength bismuth0based erbium-doped fiber laser based on four-wave-mixing effect in photonic crystal fiber,” Optics & Laser Technology, vol. 42, pp. 1250–1252, 2010.
[5] N. S. Shahabuddin, et al, "Multi-wavelength fiber laser based on nonlinear polarization rotation in semiconductor optical amplifier and photonic crystal fiber,” Laser Physics, vol. 22, pp. 1257–1259, 2012.
[6] F. Banhart, "Irradiation effects in carbon nanostructures,” Reports on Progress in Physics, vol. 62, pp. 1181, 1999
[7] S. Yamashita, et al, "Saturable absorbers incorporating carbon nanotubes directly synthesized onto substrates and fiber and their application to mode-locked fiber lasers,” Optics Letters, vol. 29, pp. 1581–1583, 2004.
[8] K. N Chen, Y. H. Lin, G. R. Lin, "Single- and double-walled carbon nanotube based saturable absorbers for passive mode-locking of an erbium-doped fiber laser,” Laser Physics, vol. 23, pp. 045105, 2013.