## A high spectral efficiency optical OFDM scheme based on interleaved multiplexing |

Optics Express, Vol. 18, Issue 25, pp. 26149-26154 (2010)

http://dx.doi.org/10.1364/OE.18.026149

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### Abstract

By multiplexing two OFDM signals with the same channel space and bit rate together in an interleaved mode, a novel optical multiplexing scheme is proposed and experimentally demonstrated. Since the channel space is halved, the spectral efficiency is doubled compared with conventional OFDM. It is proved that the orthogonality between the subcarriers is maintained as long as the data is real. With discrete Fourier transform, the proposed scheme has similar computational complexity as conventional OFDM and single sideband modulation is conveniently achieved. A 10 Gb/s transmission system is set up, and proves the feasibility and efficiency of the scheme experimentally.

© 2010 OSA

## 1. Introduction

1. E. B. Desurvire, “Capacity Demand and Technology Challenges for Lightwave Systems in the Next Two Decades,” J. Lightwave Technol. **24**(12), 4697–4710 (2006). [CrossRef]

10. W. Shieh, X. Yi, Y. Ma, and Q. Yang, “Coherent optical OFDM: has its time come? [Invited],” J. Opt. Networking **7**(3), 234–255 (2008). [CrossRef]

13. X. Yi, W. Shieh, and Y. Ma, “Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission,” J. Lightwave Technol. **26**(10), 1309–1316 (2008). [CrossRef]

## 2. OFDM interleaved multiplexing

_{0}~a

_{n-1}are the baseband data. The first and second terms of Eq. (1) are just the expression of the conventional OFDM modulation, whose spectral are shown in insets (a) and (b) of Fig. 1 respectively. In Eq. (1), odd and even terms of the baseband data are multiplexed separately, which is solely to simplify the mathematical expression. The factor exp(jπ × t/T) in Eq. (1) presents the frequency shift between the two OFDM signals, which exactly equals to half of the channel space. Inset (c) of Fig. 1 shows the spectrum of the signal after multiplexing, and it is apparently that with the proposed scheme, the SE is doubled compared with the conventional OFDM. It is obvious in inset (c) of Fig. 1 that the subcarriers are disturbed terribly by each other, however, the following part of this section will prove that the subcarriers are still orthogonal with each other as long as the data carried by them are real numbers.

## 3. Experiment setup and results

^{−3}, which is the FEC limit, is less than 1dB.

## 4. Conclusion

## Acknowledgements

## References and links

1. | E. B. Desurvire, “Capacity Demand and Technology Challenges for Lightwave Systems in the Next Two Decades,” J. Lightwave Technol. |

2. | K. Zbigniew, “Multimedia need more bandwidth- May internet collapse?” International Conference on Transparent Optical Networks “Mediterranean Winter” (2007) |

3. | K. T. Murata, E. Kimura, K. Yamamoto, D. Matsuoka, H. Shimazu, Y. Kitamura, K. Fukazawa, J. Tanaka, T. Ikeda, and Y. Kurokawa, “A Bandwidth Challenge at Super Computing (SC) Conference: Large-Scale Data Transfer Using 10Gbps Network, ” OFC (2009) |

4. | D. Fisher, “Optical Communication Challenges for a Future Internet Design,” OFC (2009) |

5. | Y.-K. Huang, D. Qian, R. E. Saperstein, P. N. Ji, N. Cvijetic, L. Xu, and T. Wang, “Dual-polarization 2×2 IFFT/FFT optical signal processing for 100-Gb/s QPSK-PDM all-optical OFDM,”, OFC (2009) |

6. | Y. Ma, Q. Yang, Y. Tang, S. Chen, and W. Shieh, “1-Tb/s Single-Channel Coherent Optical OFDM Transmission With Orthogonal-Band Multiplexing and Subwavelength Bandwidth Access,” J. Lightwave Technol. |

7. | R. P. Giddings, X. Q. Jin, E. Hugues-Salas, E. Giacoumidis, J. L. Wei, and J. M. Tang, “Experimental demonstration of a record high 11.25Gb/s real-time optical OFDM transceiver supporting 25km SMF end-to-end transmission in simple IMDD systems,” Opt. Express |

8. | T. H. Lotz, R. Urbansky, and W. Sauer-Greff, “Iterative forward Error Correction Decoding for Spectral Efficient Optical OFDM Transmission Systems,” in Signal Processing in Photonic Communications, OSA Technical Digest (CD) (Optical Society of America, 2010), paper SPThA2. |

9. | M. Markus, and H. Herbert, “PMD Tolerant Direct-Detection Optical OFDM System,” ECOC (2007) |

10. | W. Shieh, X. Yi, Y. Ma, and Q. Yang, “Coherent optical OFDM: has its time come? [Invited],” J. Opt. Networking |

11. | J. Zhao, and A. D. Ellis, “A Novel Optical Fast OFDM with Reduced Channel Spacing Equal to Half of the Symbol Rate Per Carrier,” OFC (2010) |

12. | A. Ali, J. Leibrich, and W. Rosenkranz, “Spectral Efficiency and Receiver Sensitivity in Direct Detection Optical-OFDM,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2009), paper OMT7. |

13. | X. Yi, W. Shieh, and Y. Ma, “Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission,” J. Lightwave Technol. |

**OCIS Codes**

(060.2330) Fiber optics and optical communications : Fiber optics communications

(060.4230) Fiber optics and optical communications : Multiplexing

(060.4250) Fiber optics and optical communications : Networks

(060.4510) Fiber optics and optical communications : Optical communications

**ToC Category:**

Fiber Optics and Optical Communications

**History**

Original Manuscript: October 12, 2010

Revised Manuscript: November 15, 2010

Manuscript Accepted: November 15, 2010

Published: November 30, 2010

**Citation**

Cheng Lei, Hongwei Chen, Minghua Chen, and Shizhong Xie, "A high spectral efficiency optical OFDM scheme based on interleaved multiplexing," Opt. Express **18**, 26149-26154 (2010)

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-25-26149

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### References

- E. B. Desurvire, “Capacity Demand and Technology Challenges for Lightwave Systems in the Next Two Decades,” J. Lightwave Technol. 24(12), 4697–4710 (2006). [CrossRef]
- K. Zbigniew, “Multimedia need more bandwidth- May internet collapse?” International Conference on Transparent Optical Networks “Mediterranean Winter” (2007)
- K. T. Murata, E. Kimura, K. Yamamoto, D. Matsuoka, H. Shimazu, Y. Kitamura, K. Fukazawa, J. Tanaka, T. Ikeda, and Y. Kurokawa, “A Bandwidth Challenge at Super Computing (SC) Conference: Large-Scale Data Transfer Using 10Gbps Network, ” OFC (2009)
- D. Fisher, “Optical Communication Challenges for a Future Internet Design,” OFC (2009)
- Y.-K. Huang, D. Qian, R. E. Saperstein, P. N. Ji, N. Cvijetic, L. Xu, and T. Wang, “Dual-polarization 2×2 IFFT/FFT optical signal processing for 100-Gb/s QPSK-PDM all-optical OFDM,”, OFC (2009)
- Y. Ma, Q. Yang, Y. Tang, S. Chen, and W. Shieh, “1-Tb/s Single-Channel Coherent Optical OFDM Transmission With Orthogonal-Band Multiplexing and Subwavelength Bandwidth Access,” J. Lightwave Technol. 28(4), 308–315 (2010). [CrossRef]
- R. P. Giddings, X. Q. Jin, E. Hugues-Salas, E. Giacoumidis, J. L. Wei, and J. M. Tang, “Experimental demonstration of a record high 11.25Gb/s real-time optical OFDM transceiver supporting 25km SMF end-to-end transmission in simple IMDD systems,” Opt. Express 18(6), 5541–5555 (2010). [CrossRef] [PubMed]
- T. H. Lotz, R. Urbansky, and W. Sauer-Greff, “Iterative forward Error Correction Decoding for Spectral Efficient Optical OFDM Transmission Systems,” in Signal Processing in Photonic Communications, OSA Technical Digest (CD) (Optical Society of America, 2010), paper SPThA2.
- M. Markus, and H. Herbert, “PMD Tolerant Direct-Detection Optical OFDM System,” ECOC (2007)
- W. Shieh, X. Yi, Y. Ma, and Q. Yang, “Coherent optical OFDM: has its time come? [Invited],” J. Opt. Networking 7(3), 234–255 (2008). [CrossRef]
- J. Zhao, and A. D. Ellis, “A Novel Optical Fast OFDM with Reduced Channel Spacing Equal to Half of the Symbol Rate Per Carrier,” OFC (2010)
- A. Ali, J. Leibrich, and W. Rosenkranz, “Spectral Efficiency and Receiver Sensitivity in Direct Detection Optical-OFDM,” in Optical Fiber Communication Conference, OSA Technical Digest (CD) (Optical Society of America, 2009), paper OMT7.
- X. Yi, W. Shieh, and Y. Ma, “Phase Noise Effects on High Spectral Efficiency Coherent Optical OFDM Transmission,” J. Lightwave Technol. 26(10), 1309–1316 (2008). [CrossRef]

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