Abstract
When two optical pulses copropagate inside a single-mode fibre,intensity-dependent refractive index couples the pulses through across-phase modulation (XPM). We show that a second-harmonicgeneration (SHG) on a continuous-wave background is possible inthe optical fibre induced by the XPM effect. By means of amulti-scale method the nonlinearly coupled envelope equations forthe SHG are derived and their explicit solutions are provided anddiscussed.
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