Spectrally-bounded continuous-wave supercontinuum generation in a fiber with two zero-dispersion wavelengths

Abstract

A common issue in fiber-based supercontinuum (SC) generation under\ud continuous-wave pumping is that the spectral width of the resulting source is related\ud to the input power of the pump laser used. An increase of the input pump power\ud leads to an increase of the spectral width obtained at the fiber output, and therefore,\ud the average power spectral density (APSD) over the SC spectrum does not grow\ud according to the input power. For some applications it would be desired to have a\ud fixed spectral width in the SC and to increase the average PSD proportionally to the\ud input pump power. In this paper we demonstrate experimentally that SC generation\ud under continuous-wave (CW) pumping can be spectrally bounded by using a fiber\ud with two zero-dispersion wavelengths (ZDWs). Beyond a certain pump power, the\ud spectral width of the SC source remains fixed, and the APSD of the SC grows with\ud the pump power. In our experiment we generate a reasonably flat, spectrally-bounded\ud SC spanning from 1550 nm to 1700 nm. The spectral width of the source is shown to\ud be constant between 3 and 6 W of pump power. Over this range, the increase in input\ud power is directly translated in an increase in the output APSD. The experimental\ud results are confirmed by numerical simulations, which also highlight the sensitivity\ud of this configuration to variations in the fiber dispersion curve. We believe that these\ud results open the way for tailoring the spectral width of high-APSD CW SC by\ud adjusting the fiber dispersion.Ministerio de Educación y CienciaComunidad de MadridConsejo Superior de Investigaciones CientíficasConseil Régional du Nord Pas de Calai

用于1.55 μm波段超连续谱产生的高非线性色散平坦光子晶体光纤

“…Photonic crystal fibers (PCFs) can engineer optical properties by designing the optical structure in crosssection, and the unique structure of PCFs can supply optimized dispersion and nonlinearity for better SC performance [7−14] . Martin-Lopez et al [15] generated a spectrally bounded SC spanning 1550 to 1700 nm with a fiber which has two zero-dispersion wavelengths. Liao et al [16] generated a SC spectrum of 20-dB bandwidth spanning 800 to 2400 nm using a chalcogenide-tellurite composite microstructure fiber.…”