Modal propagation characteristics of mono-mode polarization maintaining optical fiber with off centered core

In this article, we present modal characteristics of single-mode polarization maintaining off centered circular core fiber in the mid infrared region. We investigate the properties such as modal birefringence, effective index and bending loss for this class of optical fiber by using FEM, a numerically efficient technique at a wavelength of 1.55 mu m. The computed value of modal birefringence suggests that the two modes are widely separated to maintain the polarization state. The computed value of effective index explains that the mode remains tightly bound to the core at e=20 mu m, and bending loss is found to be very small for a fiber having bending radius lying in microbending region at different eccentricity. This class of fiber is cheap, practical and promising as well.