An elliptical-core hole assisted single-polarization fiber was designed, fabricated, and characterized. Numerical modeling based on the vectorial Maxwell equation reveals the dependence of the single-polarization bandwidth on core delta and air-hole size. Several single-polarization fibers based on this design with their single-polarization operating windows centered between 0.9 and 1.5µm were successfully demonstrated. A correlation between fiber birefringence and single-polarization operating bandwidth is qualitatively confirmed. A single-polarization bandwidth as high as 55 nm was observed. These fibers also show very high extinction ratios of 60 dB or higher at lengths much shorter than 1 m. Other properties such as the dependence on length of the single-polarization operating window were also measured.
© 2004 Optical Society of America
Daniel A. Nolan, George E. Berkey, Ming-Jun Li, Xin Chen, William A. Wood, and Luis A. Zenteno, "Single-polarization fiber with a high extinction ratio," Opt. Lett. 29, 1855-1857 (2004)