A STUDY ON PHOTONIC CRYSTAL FIBERS AND ITS NUMERICAL RESULT WITH MODE OF OPERATION

ABSTRACT

The use of optical fiber in communication has revolutionized the telecommunication industry in the way signal is transmitted. The application of optical fiber in long haul transmission requires small but nonzero chromatic dispersion fiber to avoid nonlinear interaction that will cause signal distortion. Standard single-mode fiber has positive chromatic dispersion that leads to greater dispersion magnitude as the optical signal travels over longer distances. Therefore, a dispersion management system has to be designed to nullify the accumulated positive dispersion in order to ensure signal integrity. This can be achieved by inserting dispersion-compensating fiber (DCF) with negative dispersion in the transmission link. Unfortunately, there is always residual dispersion that remains even after the DCF, thus requiring additional dispersion compensation. In this paper, we report a numerical investigation on PCF-in-PCF for compensating the residual dispersion following DCF usage. The PCF-in-PCF structure exhibits ultrahigh negative dispersion (−457.4 ps/nm/km) over wavelengths range bigger than E+S+C+L+U (1360 nm to 1690 nm). In addition, the effect of variation in structure parameters on dispersion value and effective mode area is investigated. Finally, we obtained the nonlinear coefficient from the effective-mode-area characteristic.

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