Design and analysis of all-optical 4 x 1 multiplexer based on 2D photonic crystal

In this paper, we present an all-optical 4 x1 multiplexer (MUX) employing two-dimensional 15a x 15a square lattice of silicon poles in air photonic crystals (PhCs). The proposed device structure has small footprint of 116.28 mu m2 and the functionality of the device has been validated by employing finite-difference-time-domain (FDTD) method. Performance of the MUX has been investigated in terms of contrast ratio (CR) and transmission ratio (TR) as a function of refractive index (RI) and rod radius (RR) and the outputs have been verified through distribution of the optical field at a wavelength of 1.55 mu m. The proposed device exhibits CR, TR, and insertion loss of up to 14.7, 6.52 and -8.14 dB respectively. The proposed device finds applications in optical signal processors, optical computing, photonic integrated devices, and optical networking.