Designing an ultra negative dispersion Photonic Crystal Fiber (PCFs) with square lattice geometry

TL;DR

This paper theoretically designs a dual-core photonic crystal fiber with square lattice geometry that achieves extremely high negative dispersion, making it highly suitable for dispersion compensation in long-haul optical communications.

Contribution

It introduces a novel dual-core PCF with square lattice geometry that attains unprecedented negative dispersion values through parameter optimization.

Findings

Achieved a negative dispersion of -47,500 ps/nm/km at 1550nm.

Demonstrated the fiber's potential for superior dispersion compensation.

Analyzed the effects of geometrical parameters on dispersion characteristics.

Abstract

In this article we have theoretically investigated the dispersion characteristics of dual-core PCF, based on square-lattice geometry by varying different parameters. The fiber exhibits a very large negative dispersion because of rapid slope change of the refractive indices at the coupling wavelength between the inner core and outer core. The dependence of different geometrical parameters namely hole-to-hole spacing (pitch) and different air-hole diameter (d) was investigated in detail. By proper adjustment of the available parameters, a high negative dispersion value of -47,500 ps/nm/km has been achieved around the wavelength of 1550nm. Our proposed fiber will be an excellent device for dispersion compensation in long-haul data transmission as being thousand times more than the available DCFs.