Ultra-High Bit Rate All-Optical Half Subtractor Based on Photonic Crystal

What is it about?

All-optical Half Subtractor (AOHS), photonic crystal, ring resonator, optical computing, interference-based phenomenon, ultra-high bit rate.

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Why is it important?

An innovative two-dimensional photonic crystal based all-optical Half Subtractor was constructed, simulated and evaluated. It was arranged on a linear square lattice photonic crystal platform. An ultra-compact, simple design occupying an area of 128.52 μm2 was constructed. The suggested design includes one ring resonator with cylindrical silicon rods organized in an air background. Phase shifter unit or auxiliary inputs are not required for its operation. Finite difference time domain and plane wave expansion methods were used for analysing the s tructure. Rod’s radius was enhanced to provide a successful operation at 1.54 µm with 0.108 µm inner rod radius. The outcome is an ultra-high bit rate of 6.33 Tbit/s. The main drawbacks of this design lie in its lowest contrast ratio of 3.237 dB, and the des ign is highly s ens itive to the waveguide’s length .