All-Optical Demultiplexer: A Review on Recent Research and Developments

Optical demultiplexers are among the crucial optical components that are required for efficient data transmission and all-optical processing. The article summarizes the recent developments on all-optical demultiplexers reported in the past decade based on the Photonic Crystal (PhC) platform. Detail description of the different demultiplexer designs reported along with the underlying parameters and performance metrics have been presented. The review is essentially clustered into two categories of the PhC namely rods in air (RIA), and holes in slab (HIS) structures that are being utilized in the reported designs. The comparative merits and demerits are also discussed with sufficient deliberation. Finally, some perspectives for future investigations have been discussed thereby providing the direction to upcoming researchers in this domain.