Distributed-Phase OCDMA Encoder–Decoders Based on Fiber Bragg Gratings

Abstract—We propose and demonstrate new optical code-division multiple-access (OCDMA) encoder–decoders having a continuous phase-distribution. With the same spatial refractive index distribution as the reconfigurable optical phase encoder–decoders, they are inherently suitable for the application in reconfigurable OCDMA systems. Furthermore, compared with conventional discrete-phase devices, they also have additional advantages of being more tolerant to input pulsewidth and, therefore, have the potential of bandwidth saving. Index Terms—Code-division multiplexing, fiber-optics commu-nication, gratings, optical fiber devices