Propagation characteristics of a single-polarization optical fiber with an elliptic core and triple-clad

This paper gives the propagation characteristics of a single-polarization optical fiber with an elliptic core and triple-clad. This fiber is designed so as to satisfy the zero total dispersion at the operating wavelength of 1.55 mum in the single-polarization region. Thus far, we had studied the n propagation characteristics of single-polarization optical fibers with pits between an elliptic core and the outer cladding (Type-1 in Fig. 1) and with pits alongside the major axis of an elliptic core (Type-2 in Fig. 1). In this paper, it is found that a single-polarization optical fiber with an elliptic core and triple-clad has better propagation characteristics compared with Type-1 and Type-2. When the relative index difference between the core and the outer cladding is 0.5%, the main comparison results are as follows: 1) The minimum wavelength sensitivity of the total dispersion can be reduced by approximately 1/3 of those for Type-1 and Type-2, and 2) the single-polarization bandwidth is 2.2 times larger than those of Type-1 and Type-2.