Supercontinuum Generation in Standard Single-Mode Fiber
Pumped by a Nanosecond-Pulse Laser¹

X. M. Liu*, L. R. Wang, D. Mao, and L. N. Duan

State Key Laboratory of Transient Optics and Photonics, Xi 'an Institute of Optics and Precision Mechanics,
Chinese Academy of Sciences, Xi’an 710119, China

*e-mail: liuxueming72@yahoo.com

Received July 5, 2011; in final form, July 9, 2011; published online October 24, 2011

Abstract—We have experimentally investigated supercontinuum generation in a conventional single-mode
fiber pumped with a nanosecond pulse source. The experimental results show that, when pump power increases,
the spectral flatness is improved obviously and the spectral broadening only occurs in a red-shifted radiation
rather than a blue-shifted radiation. A supercontinuum source is experimentally reported with a flatness of 4.7
dB over 180 nm (ranging from 1555 to >1735 nm) at pump power P_R = 5 W and is predicted to have the flatness
of less than 1 dB at P_R > 8 W. The cascade of stimulated Raman scattering (SRS) together with soliton fission
plays the key roles in supercontinuum generation.

10.1134/S1054660X11230113

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