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Rayleigh Backscattering Performance of OFDM-QAM in Carrier Distributed Passive Optical Networks

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Fig. 1. Schematic of DWDM-PON. AWG: arrayed waveguide grating; OC: op- op-tical circulator; Carrier-RB and signal-RB: carrier and signal generated RB
Fig. 3. Measured RF spectrum of the 4-Gb/s OFDM-QAM signal, occupying 1-GHz bandwidth
Fig. 6. Measured OFDM-16QAM constellation diagrams under. (a) Carrier- Carrier-RB and (b) signal-Carrier-RB at OSRNR of 22.5 dB.

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