In this paper we presented a dual core Octagonal shape Photonic Crystal Fiber to achieve a high negative dispersion coefficient of -1650 ps/ns/km at a communication wavelength 1550nm. The effect of structural parameters on birefringence, dispersion and the coupling length of designed fiber is analyzed using coupling mode theory and the fullvector finite element method (FEM). In the cladding region, the air hole diameter is reduced to achieve a high negative dispersion coefficient. This design support single- endless transmission over a wide wavelength range of 1350-1750nm including S, C, L bands of communication system. This dual core PCF design achieved a short coupling length in the range of (32-36) μm and a birefringence value in the order of 10-3 is also observed. © 2006-2016 Asian Research Publishing Network (ARPN). All rights reserved.