A highly nonlinear and birefringent photonic crystal fiber with zero dispersion at 2 µm eye-safe spectral window

Abstract

A novel highly nonlinear and birefringent photonic crystal fiber with zero dispersion at 2 $\mathrm{\mu }$m eye-safe spectral window is proposed in this paper. By using the full-vector finite-element method, the key propagation characteristics of the designed PCF are investigated at 2 $\mathrm{\mu }$m eye-safe spectral window. Furthermore, a more effective and accurate method has been used to optimize the two small air holes diameters of $d_1$ and the ratio of $d/\mathrm{\Lambda }$ at the wavelength of 2 $\mathrm{\mu }$m. When the parameters of $d_1$ and d/$\mathrm{\Lambda }$ are 0.2 $\mathrm{\mu }$m and 0.91, the birefringence, nonlinearity and confinement loss can reach to an order of ${10}^{-2}$, 25.32  ${\mathrm{W}}^{-1}·{\mathrm{km}}^{-1}$, and 0.044 dB/m, respectively. The zero-dispersion coefficient of the designed PCF can be achieved at the wavelength of 2 $\mathrm{\mu }$m.

Keywords:

• photonic crystal fiber
• birefringence
• zero dispersion

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant number 61178026], [grant number 61475134]; the Nature Science Foundation of Hebei Province, China [grant number E2012203035].