Etude et modélisation d’un guide à cristaux photoniques.

Abstract

2D CPh waveguides play an important role in the realization of very dense integrated optical circuits. They are considered appropriate structures for the creation of optoelectronic processors because of their low losses and their great ability to guide and control light. T-Shaped waveguide geometries constitute the first stage of power divider systems for the construction of completely optical digital computing circuits. The objective of this work is in the framework of all the studies carried out in several structures in geometries of waveguides based on 2D CPhs such as: linear guide W1, 90 ° curved guide and the junction in form T, which have a minimum of losses. The use of the FDTD time resolved finite difference method and the PWE plane wave composition method which are necessary for their efficiency in modeling devices in waveguide geometry. For proper performance, the T-shaped divider must be designed to have the lowest reflection at the junction. Indeed, a new topology for the realization of an optical power divider based on a 2D photonic crystal has been demonstrated, using the software Rsoft-CAD with its simulation modules. It has been shown that by creating a chalcogenide glass power divider with a structural improvement in stem size and mesh parameter and by introducing additional rods at the center of the T junction, the rate of the spectral response of the transmitted light will be greater than 99.8% in the optical wavelength λ = 1550nm. In particular, this topology represents an excellent confinement of the light wave so that the optimized divider represents a good parallel improvement of the power transmission at the output. Compared with previous work, this structure shows a more powerful power-energy division with a wide bandwidth [1540-1600] nm. This structure has a recent and diverse activity in the design of all-optical signal processing circuits, optical computer systems and logical functions: XOR, AND, ......