Efficiency of dispersive wave generation in dual concentric core microstructured fiber

TL;DR

This paper investigates how a dual concentric core microstructured fiber efficiently generates dispersive waves at 1548 nm, achieving up to 50% conversion efficiency through experimental and theoretical analysis of fiber dispersion and soliton dynamics.

Contribution

It provides new insights into the high-efficiency dispersive wave generation in dual core fibers by combining experimental measurements with numerical and analytical models.

Findings

Dispersive waves at 1548 nm with 50% efficiency observed.

Three zeros in the dispersion curve enhance dispersive wave amplitude.

Fiber dispersion profile and soliton red-shift are key to efficiency.

Abstract

We describe the generation of powerful dispersive waves that are observed when pumping a dual concentric core microstructured fiber by means of a sub-nanosecond laser emitting at the wavelength of~1064 nm. The presence of three zeros in the dispersion curve, their spectral separation from the pump wavelength, and the complex dynamics of solitons originated by the pump pulse break-up, all contribute to boost the amplitude of the dispersive wave on the long-wavelength side of the pump. The measured conversion efficiency towards the dispersive wave at 1548 nm is as high as 50%. Our experimental analysis of the output spectra is completed by the acquisition of the time delays of the different spectral components. Numerical simulations and an analytical perturbative analysis identify the central wavelength of the red-shifted pump solitons and the dispersion profile of the fiber as the key parameters for determining the efficiency of the dispersive wave generation process.