Dual Ring Resonator Based 3D-Photonic Crystal For Add Drop Filter Using FDTD-Least Square Technique

The structure of an optical add-drop filter (ADF) which depends on a very-compact ring resonator made from a photonic crystal has been presented in the paper. An adequate structure of a three channel wavelength de-multiplexer along with a finite difference time domain is demonstrated in the visibility area. A 3D triangular lattice photonic crystal with 1.735 nm air pores in a silicon nitride planar waveguide provides a constraint for the light which can be detected. The double resonator has been simulated on a three-dimension photonic crystal and for the simulation of results, MATLAB has been used. The resultant structure consisting of three drops wavelengths at λ₁ = 1555 nm, λ₂ = 1579 nm, and λ₃ = 1595 nm approximately. The average spacing between the adjacent channels is around 20 nm and the FSR obtained from numerical simulation is about 179 GHz. The output wavelength carries normalized transmissions of 0.97 having an inner rod radius for inner core 800. In addition to this, the Alternating Least Square—Add-Drop Filter (ADF)—Finite Difference Time Domain method has been used to achieve three various outputs such as transmitted intensity, reflectivity fineness, and constant factor. In future aspects, the simulation results can be further used in the fields of networks to design more accurate and efficient photonic crystals based on de-multiplexing devices.