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Photonic CDMA by coherent matched filtering using time-addressed coding in optical ladder networks

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3 Author(s)
Sampson, D.D. ; Phys. Lab., Kent Univ., Canterbury, UK ; Griffin, R.A. ; Jackson, D.A.

We investigate a photonic CDMA system based on coherent matched filtering in ladder networks, employing both time-spreading and selective interference to discriminate wanted from unwanted signals. A theory is presented for time-resolved pulses which takes account of arbitrary source coherence. We examine the key issues of optical source requirement's and phase and polarization control of en/decoder networks. And demonstrate key concepts experimentally. The crosstalk-limited signal-to-noise ratio is shown to be much higher than previous, purely incoherent systems. CDMA systems using coherent matched filtering therefore offer renewed promise for practical high capacity, multigigabit/s, multiuser networks

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Lightwave Technology, Journal of  (Volume:12 ,  Issue: 11 )