Optical code-division multiple access (OCDMA) for high-speed multimedia transmission is proposed and its performance is investigated. The proposed system introduces time hopping to vary transmission bit rate and power control to control performance of transmission signal, which allows various signals with different desired rate and performance. An expression for the bit error rate (BER) of the proposed system is derived and the numerical results are shown. Optical power selector (OPS) coupled with hard limiter are also proposed to improve system performance. The OPS is a device to transmit the instantaneous maximum optical power among input signals. The OPS combined with the optical hard limiter reduces the interference from simultaneous users which results in an improved BER. BER is theoretically derived and the numerical results for some parameters are shown. We show that the proposed system with the OPS and hard limiter significantly improve BER and that the proposed system is one of the attractive scheme for future multimedia networks.
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