Approaching to Genuine Monochromatic Light Filters Employing A Serially Coupled Triple Ring Resonator System

Abstract

This paper presents the design and analysis of an optical channel drop filters configuration based on a serially coupled triple ring resonator system. The filtering characteristics of such the proposed ring configuration have been investigated by using the mathematical model simulation. In this work, the optical signal as a Gaussian pulse with a specified wavelength ranges from 1545 nm to 1555 nm is used to be the input signal that launches into and propagates through the ring resonators. Whereupon, the required optical channels are obtained at the drop port. The center wavelength of these filtering optical channels can be specified and controlled by selectively applying the suitable parameters to the system, such as each the ring radius and the coupling coefficients. From the simulation results, an ultra-narrow band optical channel with a spectral width at FWHM of approximately 12 pm can be achieved. Furthermore, an attempt to tune the filtering responses of the proposed system, by customizing the refractive index of the waveguide material, has been illustrated. By din of the tuning technique, the free spectral range shift between adjacent channels of approximately 46 pm, which corresponds to be less than 6.25 GHz of a channel spacing in DWDM system, can be actualized. The potential of using such the triple ring device for filtering application is performed and discussed.