Dual segmented core fiber for flattening of dispersion in E + S + C + L band
摘要
This paper introduces fiber designs characterized by extremely flattened dispersion with minimal slope of dispersion and exceptionally very high effective areas across a broad range of spectra. This design composed of a multilayer core with concentric segments, complemented by a trench and then a segmented secondary core. The core at the center contributes to maintain the flattened dispersion characteristics across a wide wavelength range. The secondary core enhances the effective area significantly, while the trench between the two cores minimizes bending losses. To analyze the fiber design, we employ the transfer matrix method. In our research, we have achieved remarkable optimization in dispersion properties. We have achieved near zero dispersion, where the values related to dispersion span from [(‒0.975)-(0.477)] psec/km/nm in the wavelength span from1.35 to1.60 µm and in the wavelength range from 1.60 to1.65 µm dispersion varies from [(0.64)-(5.62)] psec/km/nm while the dispersion slopes vary between [(‒0.00072)-(0.129)] psec/km/nm2 in the wavelength span of 1.35–1.65 µm. The proposed fiber design boasts an extraordinary effective area having values in between 86 and 480 µm2 within the above said spectral range, covering the complete E + S + C + L-band. The calculated effective area values significantly surpass the reported data existing in literature for dispersion-flattened fibers with very large mode area. Furthermore, a minimal bending loss at 1.55 µm for bending radius of 15 mm is 5.2 × 10‒9 dB/km has been observed in designed fiber. This research represents a groundbreaking achievement in enhancing the mode field area of single-mode optical fibers, offering both dispersion with a flattened profile and exceptionally minimum value of dispersion slope, thereby opening up exciting possibilities for advanced optical communication and signal processing applications.