Design of simple circular photonic crystal fiber having ultra-large negative dispersion and high birefringence for dispersion compensation

• Published in: Optical and quantum electronics 2024-10, Vol.56 (10), Article 1726
• Main Author: Mondal, Kajal
• Format: Article
• Language: English
• Subjects: Birefringence; Broadband; Characterization and Evaluation of Materials; Compensation; Computation; Computer Communication Networks; Crystal fibers; Crystal lattices; Design; Design analysis; Dispersion curve analysis; Electrical Engineering; Lasers; Lattice design; Narrowband; Optical Devices; Optics; Parameters; Photonic crystals; Photonics; Physics; Physics and Astronomy
• ISSN: 1572-817X; 0306-8919; 1572-817X
• DOI: 10.1007/s11082-024-07616-9

In this study, a simple air-silica microstructure based on circular-lattice geometry is designed and analyzed to achieve an ultra-large negative dispersion coefficient and high birefringence simultaneously for dispersion compensation. The fiber design has been analyzed numerically by utilizing finite difference mode convergence technique. The influences of varying various geometrical parameters on the dispersion as well as on the birefringence properties have been examined. Through a systematic analysis, the geometrical parameters of the design have been optimized for achieving the desired results. Finally, two photonic crystal fiber designs for narrowband and another design for broadband dispersion compensation have been proposed. The proposed narrowband designs exhibit high negative dispersion of −10,388 and −4,542 ps/nm/km, with birefringence values of 4 × 10 −3 and 5.4 × 10 −3 at a wavelength of 1.55 μm, respectively. The computed FWHM of the dispersion curves of these designed fibers are found to be 30 and 100 nm, respectively. For the broadband design, dispersion coefficient between −452 and −1,408 ps/nm/km has been achieved over the wide wavelength range of 1.4 to 1.7 μm. Additionally, the compensation ratio and relative dispersion slope of the proposed broadband design have been computed. It is observed that the design provides a negative dispersion coefficient of −932 ps/nm/km and a relative dispersion slope of 0.0036 nm −1 at 1.55 μm wavelength with a birefringence value of 1.23 × 10 −2 .