Light Amplification in Cascaded Silicon Structures

In this paper we propose an integration of an amplifier and a filter in a single ultra-compact photonic crystal (PC) platform. The proposed platform consists of three PCs of different air holes radii with the same lattice constant a. The PC in the center of the platform is constructed of D-shapes which contain defects with different shapes, used as a central building block for photonic amplifier. We show that by cascading three PC building blocks, the output signal increases to almost 90% when the control beam is ON, whilst it drops to less than 20% when the beam is switched OFF. Our proposed structure would play a significant role on designing future highly-integrated optical communications chip-to-chip quantum computing and photonic information processing.