In this paper, the use of power and weight control in multimedia, variable quality-of-services (QoS) incoherent optical code-division multiple-access (O-CDMA) systems in on-off keying is studied. An adjustable-power and variable-weight incoherent O-CDMA architecture is presented and the general performance model of 1-D and 2-D double-weight optical codes with an arbitrary maximum cross-correlation value λ_c is formulated as functions of code weight and chip power. Our results show that the performance of double-weight codes can be fine-tuned by varying both code weight and power, and they play different roles in the QoS differentiation. From the numerical examples, we show that λ_c=2 double-weight codes can perform as good as their λ_c=1 counterparts and, at the same time, have the advantage of supporting more possible subscribers. This general analytical model is important for power-sensitive applications, such as in-service monitoring and fiber-fault surveillance in optical networks and sensor-identification in fiber-sensor systems with the use of optical codes.

© 2011 IEEE

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