Sensitive and Accurate Dispersion Map Extraction of HNLFs by Frequency Tuning of a Degenerate FWM

Abstract

Abstract-A sensitive and accurate method for dispersion map extraction along an arbitrarily profiled highly nonlinear fiber (HNLF) is proposed. High sensitivity is achieved by positioning the wavelength of a signal at the band edge of the modulation instability (MI) spectrum generated by an intense degenerate four wave mixing (FWM) pump. In doing so, the to-be-extracted dispersion fluctuations leave a more drastic effect on the FWM-generated power since they either inflate or deflate the MI spectrum. The accuracy of the method is increased by monitoring the distribution of power along the fiber. Once the power distribution is measured along the fiber, dispersion map of the HNLF is extracted using an appropriate inverse algorithm, which reconstructs the dispersion with a highlevel ofaccuracy.Index Terms-Brillouin optical time domain analysis, dispersion map, four wave mixing, highly nonlinear fiber, parametric amplification, zero-dispersion wavelength.

Broadband Enhancement of Optical Frequency Comb Using Cascaded Four-Wave Mixing in Photonic Crystal Fiber

“…In 2012, Myslivets et al successfully managed to generate broadband optical frequency combs based on cascaded FWM in highly nonlinear fiber low-power, continuous-wave seeds, but the flatness is too poor [7]. High sensitivity in highly nonlinear fiber (HNLF) was achieved when the signal's wavelength is positioned at the band edge of the modulation instability (MI) spectrum generated by an intense degenerate four-wave mixing (FWM) pump [8]. In 2008, an investigation was conducted by using conventional fibers and ultraflattened dispersion photonic crystal fibers to generate 118 FWM products over bandwidth of 300 nm [2].…”