Research On The Propagation Properties Of Airy Pulse In Photonic Crystal Fiber

Recently,a new kind of optical pulse which is called Airy pulse has entered the sight of researcher in optical field.It has ability to regenerate the peak power of its main lobe during its propagation,which means that it can transfer a long distance without supplement for its energy compared with other ordinary optical pulse.Besides,it can resist the expansion of pulse waveform caused by the dispersion effect in optical media,these give it great advantage in optics propagation.Moreover,it also has a unusual property to accelerate its group velocity during its propagation.Since these unique pulse characteristic,Airy pulse has become a hot topic in optical research.Base on this,this paper carries out researches on propagation properties of Airy pulse two kinds of photonic crystal fiber.First,we investigate both theoretically and numerically the propagation of decelerating Airy pulses in a liquid-core photonic crystal fiber which is a non-instantaneous cubic medium.In a Debye model,at variance with the case of accelerating Airy and Gaussian pulses,a decelerating Airy pulse evolves into a single soliton for weak and general non-instantaneous response.Airy pulses can hence be used to control soliton generation by temporal shaping.The effect is critically dependent on the response time,and could be used as a way to measure the Debye type response function.For highly non-instantaneous response,we theoretically find a decelerating Airy pulse is still transformed into Airy wave packet with deceleration.The theoretical predictions are confirmed by numerical simulations.Then,the supercontinuum generated by an initially chirped Airy pulse in a photonics crystal fiber with two closely spaced zero-dispersion wavelengths is investigated numerically.It is found that the initial frequency chirp change the input spectral shape of Airy pulse to an Airy pattern,resulting in the broadening of the initial spectrum.In the investigation we contrast the effects of positive and negative chirps on supercontinuum generated by both deceleration and acceleration Airy pulses and conclude that wider saturated spectrums can be obtained more efficiently by choosing deceleration Airy pulse and employing suitable positive chirps.The impact of truncation coefficient on chirped Airy pulse supercontinuum generation is also considered.