Proposal of Novel Optical Polarity-Reversing Correlator for Optical CDMA Radio Highway Network

This paper proposes a new optical polarity-reversing correlator for opticalCDMA radio highway network. We theoretically analyze thecarrier-to-interference-plus-noise power ratio of regenerated radio signal atthe control station. Analysis results clarify that optical CDMA using bipolarcode sequences can be applied to the fiber-optic link of radio highway and wecan assign more distinct code sequences to radio base stations compared withthe unipolar type correlator using prime codes. By the proposed opticalpolarity-reversing correlator using Gold codes, thecarrier-to-interference-plus-noise ratio can be more improved than theunipolar type correlator using prime codes. It is also found that for smalltransmitted optical peak power, the proposed optical polarity-reversingcorrelator using Gold codes can improve the number of maximum connected radiobase stations much more compared with the unipolar type correlator using primecodes.