Modified Octagonal Photonic Crystal Fiber for Residual Dispersion Compensation over Telecommunication Bands

A modified octagonal photonic crystal fiber (MO-PCF) is proposed and numerically investigated for the purpose of residual dispersion compensation in the optical transmission link. The results show that the proposed fiber with optimized parameters exhibits ultra-flattened negative dispersion over the 300 nm band (1380 nm to 1680 nm) with an average dispersion of -506 ps/(nm.km) and an absolute dispersion variation of 11.3 ps/(nm.km). In addition to large negative dispersion, the proposed MO-PCF also exhibits high birefringence in the order of 0.0207 at the 1550 nm wavelength. The proposed MO-PCF can be advantageously used especially for residual chromatic dispersion compensation in the wave-length-division-multiplexing optical fiber transmission system. The proposed fiber design is easy to draw and is tolerant to manufacturing imperfections.