Abstract
This paper proposes a novel architecture for coherent optical code-division
multiple-access passive optical networks (OCDMA-PON). As optical spreading
sequences, a recently introduced prime code family hereby referred to as double-padded
modified prime code (DPMPC) has been employed and analyzed. The transceivers
operate under homodyne dual-balanced detection scheme. For coherent modulation,
binary phase-shift keying is employed where the phase is modulated by Mach–Zehnder
external phase-modulator. The proposed architecture for optical network units
and line terminals are also presented and analyzed. The network scalability
of fiber link distances as well as bit-error rate, considering 1) fiber link
noise e.g., amplifier spontaneous emission noise; 2) thermal noise; 3) photo-detectors'
shot-noise; 4) relative intensity noise; and 5) mainly multiple-access interference,
have been investigated. The results have indicated that this architecture
can improve the network scalability, capacity and transmission performance,
leading to the promising scheme for optical transport networks.
© 2009 IEEE
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