Optical micro-multi-racetrack resonator filter based on SOI waveguides

•We present a new design of the optical FIR filter that is based on six racetrack resonators and silicon waveguides.•An FDTD simulation is being used to demonstrate optical pulses propagation in the filter and the filter's spectral response.•The control over the spectral characteristics is carried out by changing the geometrical parameters of the racetrack resonators.•The manufacturability of the filter is being demonstrated.

In this paper, we present a new design of optical Finite Impulse Response (FIR) filter based on combination of multi-racetrack resonators realized with Silicon waveguides. Numerical investigations were carried out on the spectral response of the proposed filters design, in order to obtain FIR band-pass filter around the photonic carrier wavelength of 1.55 μm. The proposed FIR filter was fabricated using electron beam lithography (EBL). The device was preliminary experimentally examined by a combination of scanning electron microscopy (SEM) and atomic force microscopy (AFM).