Research on Dispersion Properties of Photonic Crystal Fiber with Hexagonal Structure

The bandwidth limitations and the low dispersion value of conventional dispersion compensating optical fiber make it not conducive to production of the dispersion compensating optical fiber. In order to solve this problem,using the plane wave method,the dispersion curves of fibers with different structures have been obtained,which gives the theoretical guidance for the production of dispersion compensation fiber. Results show that for the ordinary photonic crystal fiber with hexagonal structure,the dispersion value for short-wavelength optical signal can be reduced and the long one can be increased by reducing the air hole diameter or increasing the air hole interval. Large negative dispersion value can be obtained at long wavelength by using the dual-core structure,and flatten the dispersion curve if reduce the distribution area of the air holes,the fibers with flat dispersion curves can be used as a broadband dispersion compensating fiber.