W. Chen, Z. Meng*, H. J. Zhou, and H. Luo
Department of Optic Information Science and Technology, College of Optoelectronic Science and Engineering,
National University of Defense Technology, 410073 Changsha, Hunan, China
*e-mail: zhoumeng6806@163.com, kevinkobegames@126.com
Received March 8, 2012; published online July 9, 2012
Abstract—Spontaneous and induced modulation instability (MI) in the presence of rather broadband spectra
are shown in the conventional single-mode fiber (SMF) for the first time. The broadband spectra are caused by
the amplified spontaneous emission (ASE) of the erbium-doped fiber amplifiers (EDFAs). The two kinds of MI
are seeded by noise components and a probe beam which results from two EDFAs amplification, respectively.
For the spontaneous MI, the MI threshold is shown to be ~170 mW, which contains the laser as well as the ASE
component. For the induced MI, an idler beam appears and grows with the peak power of input pulses at first,
and then multiple spectral peaks emerge.
DOI: 10.1134/S1054660X12080063
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