Compact All-Optical Encoder Based on Silicon Photonic Crystal Structure

In this paper, a photonic crystal structure composed of the silicon rods is proposed for an all-optical ۴*۲ encoder. Four input ports are connected to two outputs port via the cross-connections. Different radii of rods as defects are placed in the cross-connection region for coupling the optical waves from the input waveguides to the desired outputs. The total size of the device is about ۱۳۳ μm۲. Plane-wave expansion and finite difference time domain methods are used to calculate the band diagram and simulation of the optical wave propagation inside the structure, respectively. The maximum rise time of the device for all possible states is just about ۲۰۵ fs which is less than one in the previous works. No need to a bias port and using the same power at input ports are other advantages of this work. The normalized output power margins for logic ۰ and ۱ are calculated by ۲% and ۳۴%, respectively. The simulation results demonstrate the presented structure is capable of using in optical integrated circuits.

کلیدواژه ها:

Encoder ، Optical devices ، Photonic band gap ، Photonic crystal