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Effects of cascading optical filters are investigated for a phase modulated coherent optical OFDM system based on Hartley transform. The evaluation is performed by means of numeric simulations in a 10 Gb/s system with a total bandwidth of 10 GHz. First a back-to-back (no fiber) case is assessed. Results show a 3 dB power penalty after a single filter of only 68% of the signal bandwidth. The same penalty is achieved when cascading 10 filters of 21.6 GHz bandwidth. Additionally, the penalties associated to the introduction of fiber spans between filters are investigated.

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The feasibility of a phase modulated optical OFDM upstream transmission employing IM/DD downstream for achieving a bidirectional transmission with symmetric data rate of 10 Gb/s over a single wavelength is investigated for a passive optical access network scenario. Upstream modulation is performed using a reflective semiconductor amplifier, and coherent detection is employed at the central office. The system performance is assessed in terms of transmission distance and possible back-reflections.Peer ReviewedPostprint (published version

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