Design of Polarization-maintaining Photonic Crystal Fiber and Its Application in Highly Coherent Supercontinuum Generation

This paper proposes a polarization-maintaining photonic crystal fiber (PMPCF) and investigates its application in supercontinuum generation. The core of PMPCF is filled with CS
2
and four holes along y direction is infiltrated with C
2
H
5
OH for high birefringence. With the optimization of parameters of PMPCF, different dispersion and nonlinear profiles have been demonstrated in x-and y-direction fundamental mode, respectively. In order to obtain wide and highly coherent supercontinuum, with the pumping wavelength of 1900 nm, the temporal and spectral profiles along with coherences on different pumping pulse widths, peak powers and fiber lengths have been investigated. Simulation results verify that highly coherent octave-spanning supercontinuum can be generated for both x-polarized and y-polarized fundamental modes when appropriate pumping parameters have been applicated. In addition, when pumping peak power and propagation length increase and pumping pulse width decrease, the spectrum profiles will be wider and smoother. Furthermore, the bandwidth of supercontinuum will reach more than 1 octave in both x-and y-direction with optimized pumping parameters. Based on our calculations and analysis, the PMPCF proposed can provide a novel and proposing method for highly coherent supercontinuum generation.