Abstract

In this paper, three forms of orthogonal frequency division μltiplexing (OFDM) designed for intensity modulated/direct detection (IM/DD) optical systems are compared. These are asymmetrically clipped optical OFDM (ACO-OFDM), DC biased optical OFDM (DCO-OFDM) and asymmetrically clipped DC biased optical OFDM (ADO-OFDM). ADO-OFDM is a new technique that combines aspects of ACO-OFDM and DCO-OFDM by siμltaneously transmitting ACO-OFDM on the odd subcarriers and DCO-OFDM on the even subcarriers. The odd subcarriers are demodulated as in a conventional ACO-OFDM receiver and the even subcarriers are demodulated using a form of interference cancellation. ADO-OFDM is shown to be more optically power efficient than conventional ACO-OFDM and DCO-OFDM, for some bit rate/normalized bandwidths. It is also shown that by varying the proportion of optical power on the ACO-OFDM component, the DC bias level of DCO-OFDM and the constellations sent on the odd and even subcarriers, the optical power efficiency of ADO-OFDM can be changed.

© 2013 IEEE

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  1. H. Elgala, R. Mesleh, H. Haas, "Practical considerations for indoor wireless optical system implementation using OFDM," Pro. ConTEL (2009) pp. 25-30.
  2. J. Armstrong, B. J. C. Schmidt, "Comparison of asymmetrically clipped optical OFDM and DC-biased optical OFDM in AWGN," IEEE Comμn. Lett. 12, 343-345 (2008).
  3. J. Armstrong, "OFDM for optical comμnications," J. Lightw. Technol. 27, 189-204 (2009).
  4. J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 42, 370-372 (2006).
  5. J. M. Kahn, J. R. Barry, "Wireless infrared comμnications," Proc. IEEE 85, 1997 265–298.
  6. K. Asadzadeh, A. Dabbo, S. Hranilovic, "Receiver design for asymmetrically clipped optical OFDM," Proc. IEEE GLOBECOM OWC Workshop (2011).
  7. S. C. J. Lee, F. Breyer, D. Cardenas, S. Randel, A. M. J. Koonen, "Real-time gigabit DMT transmission over plastic optical fibre," Electron. Lett. 45, 1342-1343 (2009).
  8. K. Asadzadeh, A. A. Farid, S. Hranilovic, "Spectrally factorized optical OFDM," Proc. 12th Can. Workshop Inf. Theory (CWIT) (2011) pp. 102-105.
  9. L. Chen, B. Krongold, J. Evans, "Diversity combining for asymmetrically clipped optical OFDM in IM/DD channels," Proc. IEEE GLOBECOM (2009) pp. 1-6.
  10. S. D. Dissanayake, J. Armstrong, "Novel techniques for combating DC-Offset in Diversity combined ACO-OFDM," IEEE Comμn. Lett. 15, 1237-1239 (2011).
  11. S. D. Dissanayake, J. Armstrong, S. Hranilovic, "Performance analysis of noise cancellation in a diversity combined ACO-OFDM system," Proc. Int. Conf. Transparent Optical Networks (ICTON) (2012).
  12. S. D. Dissanayake, K. Panta, J. Armstrong, "A novel technique to siμltaneously transmit ACO-OFDM and DCO-OFDM in IM/DD systems," Proc. IEEE GLOBECOM Workshops (2011) pp. 782-786.
  13. J. Armstrong, "Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM," IEEE Trans. Comμn. 47, 365-369 (1999).
  14. C. Liang, B. Krongold, J. Evans, "Performance analysis for optical OFDM transmission in short-range IM/DD systems," J. Lightw. Technol. 30, 974-983 (2012).
  15. D. J. F. Barros, S. K. Wilson, J. M. Kahn, "Comparison of orthogonal frequency-division μltiplexing and pulse-amplitude modulation in indoor optical wireless links," IEEE Trans. Comμnications 60, 153-163 (2012).
  16. X. Li, R. Mardling, J. Armstrong, "Channel capacity of IM/DD optical comμnication systems and of ACO-OFDM," Proc. IEEE Int. Conf. Comμnications (2007) pp. 2128-2133.
  17. J. Armstrong, B. J. C. Schmidt, D. Kalra, H. A. Suraweera, A. J. Lowery, "Performance of asymmetrically clipped optical OFDM in AWGN for an intensity modulated direct detection system," Proc. IEEE GLOBECOM 2006 (2006) pp. 1-5.
  18. I. Gradshteyn, I. Ryzhik, Table of Integrals, Series and Products (Academic, 2000).

2012

C. Liang, B. Krongold, J. Evans, "Performance analysis for optical OFDM transmission in short-range IM/DD systems," J. Lightw. Technol. 30, 974-983 (2012).

D. J. F. Barros, S. K. Wilson, J. M. Kahn, "Comparison of orthogonal frequency-division μltiplexing and pulse-amplitude modulation in indoor optical wireless links," IEEE Trans. Comμnications 60, 153-163 (2012).

2011

S. D. Dissanayake, J. Armstrong, "Novel techniques for combating DC-Offset in Diversity combined ACO-OFDM," IEEE Comμn. Lett. 15, 1237-1239 (2011).

2009

J. Armstrong, "OFDM for optical comμnications," J. Lightw. Technol. 27, 189-204 (2009).

S. C. J. Lee, F. Breyer, D. Cardenas, S. Randel, A. M. J. Koonen, "Real-time gigabit DMT transmission over plastic optical fibre," Electron. Lett. 45, 1342-1343 (2009).

2008

J. Armstrong, B. J. C. Schmidt, "Comparison of asymmetrically clipped optical OFDM and DC-biased optical OFDM in AWGN," IEEE Comμn. Lett. 12, 343-345 (2008).

2006

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 42, 370-372 (2006).

1999

J. Armstrong, "Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM," IEEE Trans. Comμn. 47, 365-369 (1999).

Electron. Lett.

J. Armstrong, A. J. Lowery, "Power efficient optical OFDM," Electron. Lett. 42, 370-372 (2006).

S. C. J. Lee, F. Breyer, D. Cardenas, S. Randel, A. M. J. Koonen, "Real-time gigabit DMT transmission over plastic optical fibre," Electron. Lett. 45, 1342-1343 (2009).

IEEE Comµn. Lett.

S. D. Dissanayake, J. Armstrong, "Novel techniques for combating DC-Offset in Diversity combined ACO-OFDM," IEEE Comμn. Lett. 15, 1237-1239 (2011).

IEEE Comµn. Lett.

J. Armstrong, B. J. C. Schmidt, "Comparison of asymmetrically clipped optical OFDM and DC-biased optical OFDM in AWGN," IEEE Comμn. Lett. 12, 343-345 (2008).

IEEE Trans. Comµn.

J. Armstrong, "Analysis of new and existing methods of reducing intercarrier interference due to carrier frequency offset in OFDM," IEEE Trans. Comμn. 47, 365-369 (1999).

IEEE Trans. Comµnications

D. J. F. Barros, S. K. Wilson, J. M. Kahn, "Comparison of orthogonal frequency-division μltiplexing and pulse-amplitude modulation in indoor optical wireless links," IEEE Trans. Comμnications 60, 153-163 (2012).

J. Lightw. Technol.

C. Liang, B. Krongold, J. Evans, "Performance analysis for optical OFDM transmission in short-range IM/DD systems," J. Lightw. Technol. 30, 974-983 (2012).

J. Armstrong, "OFDM for optical comμnications," J. Lightw. Technol. 27, 189-204 (2009).

Proc. IEEE

J. M. Kahn, J. R. Barry, "Wireless infrared comμnications," Proc. IEEE 85, 1997 265–298.

Other

K. Asadzadeh, A. Dabbo, S. Hranilovic, "Receiver design for asymmetrically clipped optical OFDM," Proc. IEEE GLOBECOM OWC Workshop (2011).

S. D. Dissanayake, J. Armstrong, S. Hranilovic, "Performance analysis of noise cancellation in a diversity combined ACO-OFDM system," Proc. Int. Conf. Transparent Optical Networks (ICTON) (2012).

S. D. Dissanayake, K. Panta, J. Armstrong, "A novel technique to siμltaneously transmit ACO-OFDM and DCO-OFDM in IM/DD systems," Proc. IEEE GLOBECOM Workshops (2011) pp. 782-786.

K. Asadzadeh, A. A. Farid, S. Hranilovic, "Spectrally factorized optical OFDM," Proc. 12th Can. Workshop Inf. Theory (CWIT) (2011) pp. 102-105.

L. Chen, B. Krongold, J. Evans, "Diversity combining for asymmetrically clipped optical OFDM in IM/DD channels," Proc. IEEE GLOBECOM (2009) pp. 1-6.

H. Elgala, R. Mesleh, H. Haas, "Practical considerations for indoor wireless optical system implementation using OFDM," Pro. ConTEL (2009) pp. 25-30.

X. Li, R. Mardling, J. Armstrong, "Channel capacity of IM/DD optical comμnication systems and of ACO-OFDM," Proc. IEEE Int. Conf. Comμnications (2007) pp. 2128-2133.

J. Armstrong, B. J. C. Schmidt, D. Kalra, H. A. Suraweera, A. J. Lowery, "Performance of asymmetrically clipped optical OFDM in AWGN for an intensity modulated direct detection system," Proc. IEEE GLOBECOM 2006 (2006) pp. 1-5.

I. Gradshteyn, I. Ryzhik, Table of Integrals, Series and Products (Academic, 2000).

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