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We describe the implementation of RoF (radio-over-fiber) techniques combined with SAC (spectral-amplitude-coding) OCDMA (optical code-division multiple-access). A new code family called RMSSP (residue modified stuffed shift prime) code generated from residue method is carried out in optical CDMA scheme in optical domain. The architecture of double spreading fiber-radio network is presented in details where the direct-sequence CDMA (DS-CDMA) modulation signals in RF (radio frequency) domain are cascaded to the spectrum-coded optical carriers. Cumulative effects of MAI (multiple access interference), thermal and PIIN (phase-induced intensity noise) are taking into account in our analysis. Numerical evaluations show RMSSP code enhances the system BER (bit-error-rate) in PIIN-dominated environment when the number of simultaneous users is large, as compared to that of the former system where Hadamard code is used. This property leads us to conclude that the proposed system is an attractive candidate for radio network configured on an optical multiple-access system.

A New Code Family for Double Spread Transmissions in Radio-over-Fiber over Optical CDMA Network