Pulse Compression Based On Photonic Crystal Fiber

Ultrashort optical pulse plays a more and more important role in optical communication,optical information processing,biological detection,medical detection and high-speed optical communication system.Pulse compression technology is an important way to get ultra short optical pulse.Due to the limitation of nonlinear parameters of ordinary light,the photonic crystal fiber can well overcome the defects,photonic crystal structure,flexible design,dispersion and nonlinear characteristics has more excellent variety of traditional fiber do not have,the high nonlinearity in all-optical switching and other fields has a wide application prospect.Optical pulse compression is an important embodiment of the research and application of nonlinear effects in photonic crystal fibers.The condition of pulse compression is more harsh,and the common photonic crystal fiber is difficult to meet.It is difficult to combine with taper technology to solve this problem.Tapered photonic crystal fiber is two times taper made based on photonic crystal fiber is formed.Combining picosecond pulses with highly nonlinear photonic crystal fibers and fiber tapered technology to produce ultrashort optical pulses plays a crucial role in the research of this subject.Therefore,this paper mainly studies the self-similar compression of picosecond pulses in a conical photonic crystal fiber.In this paper,Maxwell's equations are used as the theoretical basis to calculate the theoretical model followed by the optical pulse in the optical fiber transmission,that is,the generalized nonlinear Schrodinger equation and the simplified Schrodinger equation after some parameters such as negligible loss and so on,Photonic crystal fiber propagation caused by a series of nonlinear effects,such as:self-steeping,Raman effects.According to the nonlinear self-similar pulse compression principle,the tapered fluoride photonic crystal fiber is proposed to realize self-similar compression of high-power picosecond pulses.The nonlinearity of the fiber varies greatly with the size of the air hole.Simulations were performed using GNLSE and actual fiber parameters,where the non-linear range of variability was increased from 6.28E-5 to 1.23E-3W-1/m,ignoring changes in ?2 along the length of the fiber,considering loss,dispersion,higher order dispersion And high-order nonlinearity,self-similar pulse compression was achieved in tapered fluoride photonic crystal fibers at a wavelength of 2300 nm and a length of 2.4 m,compressing the 1 ps pulse to 62.6 fs.The compressed pulse shows that the pedestal is essentially negligible.The article also analyzes the initial pulse width of the incident pulse were lps,2ps,5ps when the output was 62.6fs,120.55fs,236.69fs.According to the principle of self-similar pulse compression with decreasing dispersion,self-similar compression of high power picosecond pulses is proposed using tapered telluride photonic crystal fiber.The dispersion of this fiber varies greatly with the spacing of the pores.Simulations were performed using GNLSE and actual fiber parameters where the dispersion variation ranged from-21.003 to-571.37 ps2/km,ignoring the change in y along the fiber length z.Self-similar pulse compression was achieved in a tapered telluride photonic crystal fiber with a wavelength of 2360 nm and a length of 0.61 m,compressing the 1 ps pulse to 59.85 fs.The compressed pulse shows that the pedestal is essentially negligible.The article also analyzes the initial pulse width of the incident pulse were lps,2ps,5ps when the output was 59.85fs,85.83fs,192.16fs.