Very-large-mode-area photonic bandgap Bragg fiber polarizing in a wide spectral range

A design of a polarizing all-glass Bragg fiber with a microstructure core has been proposed for the first time. This design provides suppression of high-order modes and of one of the polarization states of the fundamental mode. The polarizing fiber was fabricated by a new, simple method based on a combination of the modified chemical vapor deposition (MCVD) process and the rod-in-tube technique. The mode field area has been found to be about $870{\mathrm{\mu m}}^2$ near $\lambda =1064\mathrm{nm}$. The polarization extinction ratio better than $13\mathrm{dB}$ has been observed over a 33% wavelength range (from 1 to $1.4\mathrm{\mu m}$) after propagation in a $1.7\mathrm{m}$ fiber piece bent to a radius of $70\mathrm{cm}$.