Hybrid OFDM experimentation based on arrayed waveguide grating for all-optical FFT implementation in PON architecture

Hybrid OFDM experimentation based on arrayed waveguide grating for all-optical FFT implementation in PON architecture

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A hybrid optical frequency division multiplexing (OFDM) system based on the electrical generation of the OFDM signal at the transmitter and on the all-optical demultiplexing of the OFDM subcarriers is experimentally demonstrated by exploiting a purposely designed arrayed waveguide grating (AWG) with 12.5 GHz frequency spacing. The AWG passively and all-optically processes a 3-subcarrier OFDM signal with fast Fourier transform functionalities, demultiplexing it into three 12.5 Gbit/s on–off keyed data at the corresponding output ports, which are then connected to the optical network users. Transmission over a 40 km feeder link is experimentally demonstrated. Taking into account the AWG's available 16 ports and four 3-subcarrier OFDM signal generators modulating independent wavelength carriers, a passive optical network (PON) architecture can be realised serving 12 optical network units with 150 Gbit/s total aggregate downstream capacity.


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      • 7. Shimizu, S., Cincotti, G., Wada, N.: ‘Demonstration of 8 × 12.5 Gbit/s all-optical OFDM system with an arrayed waveguide grating and waveform reshaping’. Proc. of European Conf. on Optical Communications (ECOC) 2012, Amsterdam, The Netherlands, September 2012, paper Th.1.A.2, doi: 10.1364/ECEOC.2012.Th.1.A.2.

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