Novel Power Efficient Optical OFDM Based on Hartley Transform for Intensity-Modulated Direct-Detection Systems

We present a novel optical orthogonal frequency division multiplexing (O-OFDM) scheme, suitable for intensity-modulated direct-detection systems, where the modulation/demodulation processing takes advantage of the fast Hartley transform algorithm. Due to the properties of the discrete Hartley transform (DHT), the conventional transmission scheme can be streamlined. We demonstrate that asymmetrically clipping (AC) technique can also be applied to DHT-based OFDM; the signal can be transmitted without the need of a DC bias, resulting in a power-efficient system, not affected by clipping noise. Hermitian symmetry is not required for the input signal. Therefore, this technique supports the double of input symbols compared to both AC and DC-biased O-OFDM, based on standard Fourier processing. The analysis in an additive white Gaussian noise channel shows that the same performance can be achieved by replacing 4, 16, and 64 QAM (quadrature-amplitude modulation) AC optical-OFDM with a simpler system based on DHT, using binary phase-shift keying (BPSK), 4 and 8 PAM (pulse-amplitude modulation), respectively.

[1]  R. Bracewell.  Discrete Hartley transform , 1983 .

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

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

[4]  Martin Vetterli,et al.  Cyclic convolution of real sequences: Hartley versus Fourier and new schemes , 1986, ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing.

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

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

[7]  G.D. Mandyam.  Interspersed sinusoidal transforms for OFDM systems , 2004, Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004..

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

[9]  A.J. Lowery,et al.  Comparison of power-efficient optical orthogonal frequency division multiplexing transmission methods , 2006, ACOFT/AOS 2006 - Australian Conference on Optical Fibre Technology/Australian Optical Society.

[10]  Jean Armstrong,et al.  Power efficient optical OFDM , 2006 .

[11]  Arthur James Lowery,et al.  Orthogonal-frequency-division multiplexing for dispersion compensation of long-haul optical systems. , 2006, Optics express.

[12]  Arthur J. Lowery,et al.  SPC07-4: Performance of Asymmetrically Clipped Optical OFDM in AWGN for an Intensity Modulated Direct Detection System , 2006, IEEE Globecom 2006.

[13]  Ricardo Merched.  On OFDM and single-carrier frequency-domain systems based on trigonometric transforms , 2006, IEEE Signal Processing Letters.

[14]  William Shieh,et al.  Coherent optical orthogonal frequency division multiplexing , 2006 .

[15]  A. Lowery,et al.  Experimental demonstrations of 20 Gbit/s direct-detection optical OFDM and 12 Gbit/s with a colorless transmitter , 2007, OFC 2007.

[16]  Arthur James Lowery,et al.  Performance of Optical OFDM in Ultralong-Haul WDM Lightwave Systems , 2007, Journal of Lightwave Technology.

[17]  A.J. Lowery,et al.  Dispersion Compensation in Long Haul Transmission Systems - an Orthogonal Approach , 2007, COIN-ACOFT 2007 - Joint International Conference on the Optical Internet and the 32nd Australian Conference on Optical Fibre Technology.

[18]  S. Randel,et al.  24-Gb/s Transmission over 730 m of Multimode Fiber by Direct Modulation of an 850-nm VCSEL Using Discrete Multi-Tone Modulation , 2007, OFC 2007.

[19]  A.J. Lowery,et al.  Experimental Demonstrations of Electronic Dispersion Compensation for Long-Haul Transmission Using Direct-Detection Optical OFDM , 2008, Journal of Lightwave Technology.

[20]  Y Tang,et al.  Coherent optical OFDM: theory and design. , 2008, Optics express.

[21]  Jean Armstrong,et al.  Comparison of Asymmetrically Clipped Optical OFDM and DC-Biased Optical OFDM in AWGN , 2008, IEEE Communications Letters.

[22]  van den Hpa Henrie Boom,et al.  High-speed transmission over multimode fiber using discrete multitone modulation , 2008 .

[23]  I. Morita,et al.  Coherent Optical 25.8-Gb/s OFDM Transmission Over 4160-km SSMF , 2008, Journal of Lightwave Technology.

[24]  A.J. Lowery.  Optical OFDM , 2008, 2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science.

[25]  H Tanaka,et al.  Optical OFDM - A Candidate for Future Long-Haul Optical Transmission Systems , 2008, OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference.

[26]  S. Jansen,et al.  121.9-Gb/s PDM-OFDM Transmission With 2-b/s/Hz Spectral Efficiency Over 1000 km of SSMF , 2009, Journal of Lightwave Technology.

[27]  W. Shieh,et al.  Experimental Demonstration and Numerical Simulation of 107-Gb/s High Spectral Efficiency Coherent Optical OFDM , 2009, Journal of Lightwave Technology.

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

[29]  V. Sacchieri,et al.  Signal processing based on trigonometric transforms for high-speed optical networks , 2009, 2009 11th International Conference on Transparent Optical Networks.