Rayleigh noise mitigation in long-reach hybrid DWDM-TDM PONs

Extended-reach PON employing 10Gb/s integrated reflective EAM-SOA

“…The access section is based upon two 32user PONs (representative of current deployments) joined before the feeder section using a 2x2 coupler, resulting in a combined 64-way split PON. This allows the introduction of the dual feeder scheme for Rayleigh backscattering (RB) noise suppression [5] in existing deployed PONs, without requiring extra fibres. In the testbed the second 32-way PON is replaced by an RB generator emulating the additional distribution and drop fibres not present in the experiment [5].…”

Demonstration of high spectral efficient OFDM-QAM long reach passive optical network

“…However, it may not provide the best ultimate solution for service providers seeking to significantly reduce the cost. Hence research attention has recently turned to more radical networks based on new types of optically amplified, large split (>100), long reach (LR) (>100km) PONs [1,2]. They would replace the separate metro and access portions of the current network with a single integrated system and are predicted to generate significant capital and operational cost savings [1].…”

Bidirectional OFDM-WDM-PON System Employing 16-QAM Intensity Modulated OFDM Downstream and OOK Modulated Upstream

“…Several modulation schemes have been demonstrated such as downstream and upstream on-off keying (OOK), downstream differential phase-shift keying (DPSK) and upstream on-off keying (OOK), downstream DPSK and upstream DPSK, downstream QPSK and upstream OOK [5][6][7][8][9]. WDM PON can also be realized by using the optical orthogonal-frequency-divisionmultiplexing (OFDM) technique [10][11][12][13][14].…”