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Since past few years photonic crystal fibers (PCFs) have become turned into one of the supreme attractive platform for the application of sensing and fiber optic transmission systems. Photonic crystal fiber contains of microscopic arrangement of air channels which is running through their dimension that make a small index cladding throughout the undoped silica core. 1 This type of hollow cladding is efficient enough to regulate the optical properties incorporating dispersion in Photonic crystal fiber in a way which is quite impossible using conventional optical fibers 2. Therefore, Photonic crystal fiber offers a great tractability in adjusting dispersion 3 which is meaningful in fabricating dispersion compensating fiber. Many other PCFs design have been constructed and tested for dispersion recompensing applications by several research teams. Birks et al. 4 first projected the knowledge of dispersion by means of PCFs for dispersion compensation applications.

PCFs offer a good quantity of exceptional dispersion properties in comparison to conventional single mode fibers for example almost zero ultra-flattened dispersion 5 and huge negative chromatic dispersion 6. In optical fiber transmission formation, controllability of dispersion coefficient is one of the main quantities in multiple variations of analysis and drawing issues for realistic applications in PCFs. Furthermore, some studies were done to gain high negative dispersion for Dense Wavelength Division Multiplexing (DWDM) applications.
Dispersion Compensating Fiber (DCF) which is broadly used to recompense the chromatic dispersion. Basically, DCFs are the coupling between two spatially illustrious asymmetric concentric cores which grips two permeable modes, one is internal mode and another is external mode. Nonetheless, few studies have been concentrated to realize high negative dispersion consists of triangular lattice PCFs 7–10.

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Optical communication systems for large bit rate, dispersion of unit velocity in optical links are one of the earliest deterioration for optical pulses as well as dispersion causes pulse to extent and it has to be recompensed in the lengthy distance optical data transmission process. One of the elegant techniques is to reduce the penalty of chromatic dispersion via dispersion compensating fibers, shows a negative chromatic dispersion which is used to balance periodically the positive chromatic dispersion.
Based on the necessities, in this paper, we have proposed a broadband dispersion compensation PCF based on square lattice pattern. This geometry has been illustrated for power transfer from the internal core to the external core from the coupling point. Our mathematical examination exhibits that a highly negative dispersion coefficient of ?1538 to ?1090 ps/( over a broad wavelength range 1350nm to 1600nm. Moreover, the projected PCF structure has a large nonlinearity of 118.2 W-1km-1 at the same operating wavelength which is greatly eligible in high speed optical communication systems for effective dispersion compensation as well as sensing and supercontinuum generation.

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