Study Of Supercontinuum Generated In Optical Fibre

With the rapid growth of the Internet capacity, fiber-optic communication will tend tolarge-capacity, high-speed, long-range development. This leads to a higher demand on thenumber of channels of the communication system as well as the width of the input spectrum.Supercontinuum has a flat band near the center wavelength and it is very meaningful toMulti-wavelength output. due to some advantages of its own, Optical fiber can be used togenerate supercontinuum. This article will focus on the following aspects of fibersupercontinuum study.First We have introduced the principle of input pulses broadening in fiber, on this basis,We focused on the nonlinear effect in fiber: Self-Phase Modulation (SPM), Cross-PhaseModulation (XPM),Stimulated Raman Scattering (SRS) and Four-Wave Mixing (FWM); Wealso described the dispersion in the optical fiber: the mode dispersion, material dispersion,and waveguide dispersion. And point out that the impact pulse broadening in the fiber iscaused by SPM and FWM due to dispersion.Then We describe the basic equation of the light transmission in optical fibers. Startingfrom the Maxwell equations, We reached the Schr dinger equation after a series of deduction.This equation is solved numerically by using the split-step Fourier method. Then we usesplit-step fourier method on matlab platform to make a simulation on the light transmissionin fiber, the simulation results confirmed that the fiber can make the input pulse spectrumbroadening.Finally, We have made a brief in introduction on special optical fiber which cangenerate supercontinuum;then we use Matlab to simulate light pulses in a high nonlinearoptical fiber, dispersion-flattened and decreasing optical fiber and photonic crystal fiber togenerate supercontinnum, qualitative analysis of these results are given in this acticle.