Optical Code-Division Multiple Access (O-CDMA) is receiving increased attention due to its potential for enhanced information security, simplified and decentralized network control, improved spectral efficiency, and increased flexibility in the granularity of bandwidth that can be provisioned. In O-CDMA, multiple access is achieved by assigning different, minimally interfering code sequences to different CDMA transmitters. This paper demonstrates a four-user 10-Gb/s spectrally phase-coded optical code-division multiple-access system via nonlinear processing with ultralow power (~30 fJ/bit). Full interference suppression is achieved in a time-slotted scheme without the need for chip-level coordination and synchronous detection.
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