Frequency shift keying using photonic crystal based ring cavity resonator

Photonic Band Gap (PBG) crystals have shown their significant role in optical data processing. Again it is seen that in optical communication and computation, Frequency Shift Keying (FSK) can extend a potential application. In PBG also the FSK can show its usefulness. The main novelty of the proposed work is the implementation of an optical FSK system designed on a 2D PBG crystal. The proposed structure contains a square-shaped lattice formed by GaAsInP-doped rods placed in an air-based substrate along with photonic crystal-based Semiconductor Optical Amplifiers (pc-SOAs). The authors also presented a theoretical model that successfully demonstrates the operation of the FSK system in the optical domain with simulation experiment. This work uses a moderate input light power and operates at a very high-speed (Tbps). Here, a ring cavity resonator with a constant biasing signal is incorporated to realize the FSK model. The intensity-encoded Boolean signal and the photonic crystal-based two Semiconductor Optical Amplifiers (pc-SOAs) are used here to establish the FSK scheme where the Boolean 1 (presence of optical signal) is encoded by another light having a frequency υ₁ and the Boolean 0 (absence of light) is encoded by another frequency of light υ₂. As the FSK is developed in the optical domain using the switching character of PBG, hence a moderate light power is enough to conduct this implementation. In this communication, the optical FSK is designed and analyzed by a simulation process with Finite-Difference-Time-Domain (FDTD) and Plane Wave Expansion (PWE) techniques.