Broadband Near‐Zero Flattened Dispersion in a Novel Hexagonal Photonic Crystal Fiber

A novel hexagonal photonic crystal fiber (PCF) design with broadband dispersion control has been proposed for use in optical communication systems. By optimizing a 1.7‐μm hole diameter and 2.60‐μm pitch, the PCF achieves near‐zero flattened dispersion from 1400 nm to 1800 nm, with dispersion ranging between +0.608 and 0.085 ps/km/nm up to 2000 nm, including +0.33 to −0.72 ps/km/nm in the 1400–1600‐nm band. The design also offers a large effective mode area at 1.5 μm, thereby reducing nonlinear effects while simplifying the modeling complexity commonly found in microstructured fibers. The proposed PCF demonstrates significant potential for applications in high‐capacity optical networks, nonlinear optics, and advanced dispersion management systems, contributing to the development of next‐generation optical fiber technologies.