Abstract
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 (Λ) 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 1550 nm. 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.
Highlights
Photonic crystal fibers (PCFs) [1, 2] or Holey Optical Fibers offered a tremendous variety of possible geometries utilizing the shape, size, and positioning of air-holes in the microstructured cladding
In this paper we have theoretically investigated chromatic dispersion compensation property exhibited by square-lattice geometry of the PCFs based on pure silica
We have shown that with an increase of bigger air-hole diameter, the peak dispersion is red-shifted with higher negative dispersion at the cost of narrower full width at half maximum (FWHM) while an increase of smaller air-hole diameter in the outer core again red-shifted the coupling wavelength but with smaller values of negative dispersion
Summary
Photonic crystal fibers (PCFs) [1, 2] or Holey Optical Fibers offered a tremendous variety of possible geometries utilizing the shape, size, and positioning of air-holes in the microstructured cladding. In this work we have studied rigorously towards achieving high negative dispersion value with regular square lattice. A square-lattice PCF preform has been realized with a standard fabrication process, stack and draw, in order to study the localization and control of high frequency sound by introducing two solid defects in the periodic distribution of air-holes [18]. The technological feasibility of the square-lattice PCFs has been demonstrated, since the final PCFs can be obtained by drawing the intermediate prepared preforms [18]. In another example, experimental study of negative refraction has been studied with squarelattice photonic crystal [19]. Square-lattice PCF can be experimentally realized like that of the usual triangular-lattice PCF
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