Abstract
In this paper, a new structure of photonic crystal fibers (PCFs) with large negative dispersion is presented in order to compensate the positive dispersion at a wavelength of 1.55 μm. The proposed PCF has square lattice structure. In the basic structure of the cladding, it consists of four square rings, so that each ring has a number of circular holes. In the final proposed structure, the two inner rings of the cladding are reshaped relative to the two outer rings. The first inner ring near the core has stellar shaped holes with gold nanoparticles in its center, and the second inner ring has circular holes with a smaller diameter than the two outer rings. The base material of this fiber is silica. The use of stellar shaped holes with gold nanoparticles cores causes a large amount of negative dispersion, which compensates the positive dispersion. Simulation results show that the minimum dispersion is − 4593 ps/(nm.km) at a wavelength of 1.55 μm which bring a significant improvement compared to other similar references.
Highlights
Photonic crystal fibers (PCFs) are one of the favorable issues which have attracted great deal of attention in optical communication applications
A new structure of photonic crystal fibers (PCFs) with large negative dispersion is presented in order to compensate the positive dispersion at a wavelength of 1.55 μm
Simulation results show that the minimum dispersion is -4593 ps/(nm.km) at a wavelength of 1.55 μm which bring a significant improvement compared to other similar references
Summary
Photonic crystal fibers (PCFs) are one of the favorable issues which have attracted great deal of attention in optical communication applications. In [9] and [10], PCF structures with low losses and dispersion have been proposed. Many structures have been proposed for dispersion compensation in photonic crystal fibers. In [13], a modified hexagonal circular photonic crystal fiber with large negative dispersion is presented. In [14], a PCF having a hybrid lattice structure with low values for the dispersion and confinement loss has been presented. In [19], ultra low confinement loss PCF with flattened dispersion is presented that applied hexagonal PCF structure with six rings of holes. A dual concentric cladding PCF was presented in [20] that it has low-loss and near-zero ultra flattened dispersion. A novel photonic crystal fiber with a large negative dispersion coefficient is presented.
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