Chromatic dispersion profile optimization of dual-concentric-core photonic crystal fibers for broadband dispersion compensation

Abstract

Chromatic dispersion profile of dual-concentric-core photonic crystal fibers is optimized for broadband dispersion compensation of single mode fibers (SMFs) by using genetic algorithm incorporated with fullvector finite-element method. From the numerical results presented here, it is found that by increasing the distance between central core and outer ring core, larger negative dispersion coefficient and better dispersion slope compensation are possible. There is a tradeoff between the magnitude of negative dispersion coefficient and dispersion slope compensation due to the concave dispersion profile of dual-concentric-core photonic crystal fibers. In spite of the tradeoff, dual-concentric-core photonic crystal fibers having larger negative dispersion coefficient as well as compensating for dispersion slope of SMFs in the entire C band with large effective area can be designed.

Study on dual-concentric-core dispersion compensation photonic crystal fiber

“…To obtain a very high dispersion, lots of designs have been proposed, such as W-model, multi-cladding model, dualconcentric-core model [2][3][4][5][6][7][8][9][10][11][12] and so on. However, the dualconcentric-core model does better than the others.…”

“…It has a high index inner core and a defect ring of reduced holes diameter in the cladding. Researchers simulate and design this kind of fiber, and have attained very high negative dispersion [7][8][9][10][11][12]. However, such high refractive index doping is difficult to realize and high doping of the core is the increasing loss due to higher GeO2.…”

“…Recently, because the structure design of the photonic crystal fiber (PCF) is flexible and dual-concentric-core fiber (DCCF) could attain high negative dispersion easily, some investigations of dual-concentric-core photonic crystal fiber (DCCPCF) [2][3][4][5][6][7][8][9][10][11][12] have attracted considerable attentions.…”

Broadband dispersion compensation using inner cladding modes in photonic crystal fibers

“…(1)]. The initial design was inspired on Dual Concentric Core Fibers (DCCF) [15,16] which have shown to be a successful design for achieving highly negative dispersion curves despite it has only been used, up to our knowledge, for central core modes applications. It was set in this way to constrain the amount of modes that can be excited into the internal clad while the final result of the optimization process was not conditioned to maintain this configuration.…”

Dispersion Effects of Fiber Bending Performed on Microstructured Fiber

“…(However, authors report that the largest negative chromatic dispersion that can be achieved in this design is −55000 ps·nm -1 ·km -1 ). Last but not least, dual core technique, applied to dispersion compensation purposes in high-speed optical systems, is investigated in [12,13]. One of the highest ever-published values of negative chromatic dispersion is reported by Yang et al [14].…”