Study on polarization properties of twin-hole poling optical fibers

Polarization properties of metal-filled twin-hole poling optical fiber are systematically investigated in this paper. Propagation and polarization dependent losses (PDLs), modal birefringence and the chromatic dispersion of the poling fiber with various fiber configurations are analyzed in detail. We revealed that a single polarization poling fiber with a length of a dozen centimeters could provide a high PDL (beyond 30 dB) and a low propagation loss (in the order of 1 dB). The choice of electrode material plays an important role for optimizing PDL and propagation loss of poling fiber. Holes with a large radius could effectively reduce the propagation loss of y-polarization while propagation loss of x-polarization mode remains approximately unchanged. The results, especially the polarization dependent characteristics are of significance for twin-hole fiber poling and applications of poled fiber devices.