Journal of Optical Communications and Networking · 2014 · 42 citations · 20 references
EngineeringCommunicationElectrical EngineeringDigital CommunicationOptoelectronicsPhotonicsCommunication NetworksFiber-optic CommunicationModulationOptical Communication SystemsOptical ModulationSpectrum AllocationBandwidthBandwidth AllocationDirect DetectionElastic Resource AllocationIntensity ModulationOptical Transmission SystemsOrthogonal Frequency-division MultiplexingPassive Optical Networks
The statistical orthogonal frequency division multiplexing passive optical network (OFDM-PON) concept with multiband optical network units (ONUs) is experimentally tested with two users and an optical line terminal at 2.5/5  Gb/s total effective capacity with binary phase-shift keying (BPSK)/quadrature phase-shift keying (QPSK) modulation. Both downstream and uplink were measured based on intensity modulation and direct detection. The ONUs consisted of local nonpreselected wavelength distributed feedback laser sources centrally controlled to reduce overlapping probability. In addition, a radio-frequency mixing stage in the ONUs up/downconverts the user data to/from the OFDM signal, reducing the computational effort. Compared with ONUs processing the whole signal, the multiband approach presents comparable results with almost symmetrical power budgets of around 25 and 20 dB with BPSK and QPSK, respectively, which could increase up to 4.5 dB by allocating a spectral guard interval between the optical carrier and the OFDM data. Furthermore, elastic bandwidth allocation is explored, which is shown to compensate for up to 18 dB differential link loss.
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Network operator requirements for the next generation of optical access networks
Philippe Chanclou, Zi-Ying Anna Cui, Frank Geilhardt et al. · IEEE Network · 2012 · 150 citations