A SINGLE-POLARIZATION OPTICAL-FIBER OF HOLLOW PIT TYPE WITH ZERO TOTAL DISPERSION AT WAVELENGTH OF 1.55-MU-M

This paper gives a design method for the single-polarization optical f iber which satisfies simultaneously the wide single-polarization bandw idth, the large modal birefringence, and the zero total dispersion at the wavelength of 1.55 mu m. As a type of single-polarization fiber, t he optical fiber with two hollow circular pits across the core-clad in terface is proposed and designed. The normalized power (triangle ident ity the power in the core/the total power) in the core is also evaluat ed for the designed fibers. It was found from the numerical analysis t hat when the zero total dispersion is satisfied at the wavelength of 1 .55 mu m, the maximum modal birefringence of 1.133 x 10(-3) and the ma ximum single-polarization bandwidth of 100.6 nm are attained for the r elative index difference of 1.6%. Then the normalized power in the cor e is 0.859.