An IFFT/FFT size Efficient Improved ACO-OFDM Scheme for Next-Generation Passive Optical Network
Résumé
In this paper, we propose for the first time, to the best of our knowledge, a novel Improved Asymmetrically Clipped Optical OFDM scheme namely, Eff-IACO-OFDM. This technique employs a novel approach to get real OFDM signals suitable for PON IM/DD systems with no use of Hermitian symmetry. Its performance is evaluated and analyzed over both an AWGN channel and realistic PON fiber link. The proposed technique is shown to achieve up to 3 dB gain in optical power over conventional ACO-OFDM and similar performance as both Noise Cancellation ACO-OFDM (NC-ACO) and Diversity-Combined ACO-OFDM (DC-ACO) over an AWGN channel. We showed by numerical simulation that the proposed Eff-IACO-OFDM technique offers significant performance improvement in terms of distance transmission (20 km) and computational complexity savings of 8% compared to ACO-OFDM for similar performance as DC-ACO with very low complexity. Also, we showed that 11.3 Gb/s transmission with 32 users is possible through 50 km SSMF link by using the proposed IFFT/FFT size Efficient IACO-OFDM method. As a result, it seems to be an interesting modulation scheme for NG-PON cost-sensitive applications.