An all-optical scheme of developing a 1 x 2 demultiplexer using photonic band gap (PBG) crystal

The authors develop an all-optical scheme of a 1 x 2 demultiplexer, which is an important element processing. Demultiplexers can be significant in the communication field by enabling the transfer of huge amounts of information. The main mechanism of this system is the appropriate selection of control signals for getting the data signal at the respective output terminals from the input. The photonic band gap (PBG) crystal is used here to implement the design of a 1 x 2 optical demultiplexer system in order to achieve THz-speed performance. For the simulation experiment, the frequency (corresponding wavelength) characteristics of the light signal are used to encode both the data input signal and two different control input signals, facilitating the easy transmission of information from one input channel to an output without any distortion. Two photonic crystal-based wavelength-selective cavities with different radii and two photonic crystal-based drop filters are used here as the essential components of this proposed design to execute the operation. Cross gain modulation (XGM) property of photonic crystal-based semiconductor optical amplifiers (pc-SOAs) are also utilized for performing frequency or wavelength converting operations by proper non-linear switching. The simulation experiment of this proposed design is also done with the help of the Finite-Difference-Time-Domain (opti-FDTD) method.