Optical code-division multiple-access (O-CDMA) is receiving increasing 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, different users whose signals may be overlapped both in time and frequency share a common communications medium; multiple-access is achieved by assigning different, minimally interfering code sequences to different CDMA transmitters. This paper demonstrates 2.5 Gb/s four user O-CDMA operation at = 10-11 BER utilizing programmable spectral phase encoding, an ultrasensitive (< 0.4 pJ/bit) PPLN-waveguide nonlinear waveform discriminator and 10G Ethernet receiver.
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