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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 29, Iss. 4 — Feb. 15, 2011
  • pp: 483–490

448-Gb/s Reduced-Guard-Interval CO-OFDM Transmission Over 2000 km of Ultra-Large-Area Fiber and Five 80-GHz-Grid ROADMs

Xiang Liu, S. Chandrasekhar, Benyuan Zhu, P. J. Winzer, Alan H. Gnauck, and David W. Peckham

Journal of Lightwave Technology, Vol. 29, Issue 4, pp. 483-490 (2011)


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Abstract

We propose a novel coherent optical orthogonal frequency-division multiplexing (CO-OFDM) scheme with reduced guard interval (RGI) for high-speed high-spectral-efficiency long-haul optical transmission. In this scheme, fiber chromatic dispersion is compensated for within the receiver rather than being accommodated by the guard interval (GI) as in conventional CO-OFDM, thereby reducing the needed GI, especially when fiber dispersion is large. We demonstrate the generation of a 448-Gb/s RGI-CO-OFDM signal with 16-QAM subcarrier modulation through orthogonal band multiplexing. This signal occupies an optical bandwidth of 60 GHz, and is transmitted over 2000 km of ultra-large-area fiber (ULAF) with five passes through an 80-GHz-grid wavelength-selective switch. Banded digital coherent detection with two detection bands is used to receive this 448-Gb/s signal. Wavelength-division multiplexed transmission of three 80-GHz spaced 448-Gb/s RGI-CO-OFDM channels is also demonstrated, achieving a net system spectral efficiency of 5.2b/s/Hz and a transmission distance of 1600 km of ULAF.

© 2010 IEEE

Citation
Xiang Liu, S. Chandrasekhar, Benyuan Zhu, P. J. Winzer, Alan H. Gnauck, and David W. Peckham, "448-Gb/s Reduced-Guard-Interval CO-OFDM Transmission Over 2000 km of Ultra-Large-Area Fiber and Five 80-GHz-Grid ROADMs," J. Lightwave Technol. 29, 483-490 (2011)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-29-4-483

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