Optical delay lines using coupled slab waveguides and ring resonator with a negative refractive index core

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Total delay time of a structure composed of a slab waveguide coupled with a ring resonator where negative refractive index material is replaced in the core of the structure is investigated in this work. In this paper, a two-port ring resonator (TPRR) which is made of a core with negative refractive index has been used to generate a time delay for a Gaussian-shaped pulse with 1GHz bandwidth. It is shown that the creation of the ring how causes more ng of a straight waveguide and results are compared with positive refractive index core TPRR. We have used metamaterial to make an n<0 media and have used two cascaded metamaterial rings to increase the bandwidth.