Design of Reconfigurable 2-D W/T OCDMA Decoder for Access Networks

The coherent Optical Code Division Multiple Access(OCDMA) systems that employ narrow bandwidth laser diodes and those that employ phase encoding generally have complex architectures are susceptible to nonlinearities and dispersion effects. Low cost passive encoders made of Fiber Bragg Gratings (FBG’s) that can be used in incoherent OCDMA have the limitation of restricted re-configurability to other codes and is fixed for each implementation. We discuss the design of a dynamically tunable incoherent OCDMA encoder and decoder based on one dimensional photonic crystal structures. This design requires low operational (optical as well as electrical) costs so as to be employed in access networks.