Experimental demonstration of a cost-effective bit rate variable IM/DD optical OFDM with reduced guard band.

We experimentally demonstrate an intensity modulated and direct detection optical OFDM with variable bit rate from 5 Gb/s to 9 Gb/s using BPSK format. A fast processing based on the Hartley transform is performed with low complexity DSP, achieving the same performance as 4QAM FFT-based processing. Using the same bandwidth occupancy as required for 5 Gb/s, the bit rate can be increased up to 80% and transmitted over 25 km SSMF, by reducing the guard band and adopting an optimized transceiver design with additional overhead, including half-length training symbols and cyclic extension.

[1]  John M. Cioffi,et al.  Discrete Hartley transform based multicarrier modulation , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[2]  Douglas L. Jones,et al.  On computing the discrete Hartley transform , 1985, IEEE Trans. Acoust. Speech Signal Process..

[3]  Hsieh S. Hou,et al.  The Fast Hartley Transform Algorithm , 1987, IEEE Transactions on Computers.

[4]  G. Junyent,et al.  Clipping and quantization noise mitigation in intensity-modulated direct detection O-OFDM systems based on the FHT , 2012, 2012 14th International Conference on Transparent Optical Networks (ICTON).

[5]  Fang Liu,et al.  A novel DHT-based ultra-wideband system , 2005, IEEE International Symposium on Communications and Information Technology, 2005. ISCIT 2005..

[6]  J. Armstrong,et al.  OFDM for Optical Communications , 2009, Journal of Lightwave Technology.

[7]  ITU-T Rec. G.975.1 (02/2004) Forward error correction for high bit-rate DWDM submarine systems , 2005 .

[8]  Michela Svaluto Moreolo.  Performance Analysis of DHT-Based Optical OFDM Using Large-Size Constellations in AWGN , 2011, IEEE Communications Letters.

[9]  R. Bracewell.  The fast Hartley transform , 1984, Proceedings of the IEEE.

[10]  Gabriel Junyent,et al.  Characterization of fast and power efficient optical OFDM transmission system based on Hartley transform , 2011, CLEO: 2011 - Laser Science to Photonic Applications.

[11]  Martin Vetterli,et al.  Improved Fourier and Hartley transform algorithms: Application to cyclic convolution of real data , 1987, IEEE Trans. Acoust. Speech Signal Process..

[12]  Josep M. Fabrega,et al.  Experimental demonstration of a cost-effective bit rate variable intensity modulation and direct detection optical OFDM with reduced guard band , 2012, 2012 38th European Conference and Exhibition on Optical Communications.

[13]  Chin-Liang Wang,et al.  A DHT-based FFT/IFFT processor for VDSL transceivers , 2001, 2001 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.01CH37221).

[14]  A. Ali,et al.  Spectral Efficiency and Receiver Sensitivity in Direct Detection Optical-OFDM , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[15]  Hideaki Tanaka,et al.  100GbE: QPSK versus OFDM , 2009 .

[16]  M. S. Moreolo,et al.  Novel Power Efficient Optical OFDM Based on Hartley Transform for Intensity-Modulated Direct-Detection Systems , 2010, Journal of Lightwave Technology.