Multi-Wavelength Ytterbium Doped Fiber Laser
Based on Longitudinal Mode Interference¹

N. S. Shahabuddin^a, M. A. Ismail^a, M. C. Paul^b, **, S. S. A. Damanhuri^c,
S. W. Harun^c, *, H. Ahmad^c, M. Pal^b, and S. K. Bhadra^b

^a Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

^b Fiber Optics and Photonics Division, Central Glass and Ceramic Research Institute, CSIR, Kolkata 70032, India

^c Photonics Research Center, Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia

*e-mail: swharun@um.edu.my

**e-mail: paulmukul@hotmail.com

Received August 1, 2011; in final form, August 3, 2011; published online November 28, 2011

Abstract—Multi-wavelength Ytterbium-doped fiber laser (YDFL) is demonstrated using a longitudinal mode
interference assisted by a four-wave mixing (FWM) effect in a ring laser cavity. The gain medium is a 16 m
long of the fabricated (Ytterbium-doped fiber) YDF, which has a core composition of 0.8 wt % of Yb₂O₃, 1.8
wt % of Al₂O₃ and 23 wt % of GeO₂, Ytterbium ion fluorescence lifetime of 1.1 ms and absorption of 9.0dB/m
at the pump wavelength of 976 nm. 20 m long photonic crystal fiber (PCF) is used to provide FWM effect so
that the energy of different oscillating lines can be redistributed to improve multi-wavelength operation. The
proposed laser generates 12 lines of optical comb with a line spacing of approximately 0.59 nm at 1035 nm
region.

10.1134/S1054660X12010173

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