Nonlinear coupling of relative intensity noise from pump to a fiber ring laser mode-locked with carbon nanotubes
Wong, Jia Haur
Shum, Perry Ping
Kelleher, E. J. R.
Chernov, A. I.
Obraztsova, E. D.
Date of Issue2010
School of Electrical and Electronic Engineering
Pump relative intensity noise (RIN) has been recognized as a major source of noise in mode-locked lasers. The coupling of RIN from the pump to the output of a passively mode-locked fiber laser (PMFL) is systematically investigated using a pump modulation technique. It is found that the linear RIN coupling ratio from pump to PMFL is decreased with an increase in modulation frequency and is independent of modulation power. Moreover, the nonlinear RIN coupling from pump to PMFL is clearly demonstrated with a square wave modulated pump. The nonlinear RIN coupling ratio is noise power dependent. An exponential decay model based on the view of gain modulation is proposed and explains well the behavior of the nonlinear coupling phenomena.
DRNTU::Engineering::Electrical and electronic engineering::Nanoelectronics
© 2010 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint (preprint) with permission of OSA. The paper can be found at the following official DOI: http://dx.doi.org/10.1364/OE.18.016663. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.