Highly coherent supercontinuum generation in a polarization-maintaining CS₂-core photonic crystal fiber

In this paper, we design a polarization-maintaining CS₂-core photonic crystal fiber (PM-CCPCF). The two air holes at x-direction are infiltrated with C₂H₅OH in order to introduce the birefringence. By optimizing the structure parameters of the PM-CCPCF, it is demonstrated that the x-polarization fundamental mode has all-normal dispersion profile and the corresponding y-polarization fundamental mode has anomalous dispersion profile for pump wavelength 1.76 μm. Then, we investigate the supercontinuum (SC) generations when different fiber lengths, pump peak powers, and pump pulse widths are chosen, respectively. Simulation results show that for the x-polarization and y-polarization fundamental modes, highly coherent SCs can be generated by appropriately choosing the fiber length and pump pulse parameters. Finally, nonlinear propagation dynamics are analysed when the optimized fiber length and pump pulse parameters are used. The bandwidth of the SCs generated for x-polarization and y-polarization fundamental mode can be up to 0.82 and 1.26 octave, respectively.