DESIGN AND ANALYSIS OF CHALCOGENIDE BASED WAVEGUIDES FOR GENERATION OF SLOW LIGHT

Abstract

A theoretical investigation of the design of a rib waveguide using highly nonlinear As2Se3 based chalcogenide glass has been carried out for slow light generation based on stimulated Brillouin scattering (SBS). The effective-modearea and confinement loss of the proposed waveguide structure has been obtained for single-mode operation and their variation with the geometrical parameters has been observed. It has been found that the time delay of ~251 ns can be achieved at a pump power of 800 mW for a 10 cm long rib waveguide. Next we have designed a modified ridge waveguide with optimised parameters to obtain approximately similar time-delay with low pump power. Maximum allowable pump power and the time delay experienced by the pulse propagating in the ridge waveguide operating at a wavelength of 1.56 μm have been calculated. A maximum delay of ~249 ns has been achieved for a 10 cm long ridge waveguide at a pump power of 390 mW. It is observed that time delay can be tuned with input pump power and length of the proposed ridge waveguide. Such tunable features of the slow light can have potential applications in realization of an all-optical network.