Abstract
We show that tunable frequency combs can be generated by launching two continuous-wave pumps at slightly different wavelengths into a normally dispersive optical fiber. The dual-pump configuration allows the tuning of comb spacing into the terahertz regime. Different pump powers and frequency separations are explored numerically to determine the effect of the input parameters on frequency comb generation. The relative power of the two pumps is found to be a critical factor through its crucial effect on optical wave breaking. The pump powers and fiber length are shown to have a significant effect on the comb width as well. Unlike in the case of supercontinuum generation, Raman scattering is found to have a negligible or even a slightly detrimental effect. Our findings also help bridge the gap between work done on the propagation of a single pulse and the evolution of dual-pump signals in normally dispersive highly nonlinear fibers.
© 2015 Optical Society of America
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