Terabit Optical Access Networks Based on WDM-OFDMA-PON

• Published in: Journal of lightwave technology 2012-02, Vol.30 (4), p.493-503
• Main Authors: Cvijetic, N., Cvijetic, M., Ming-Fang Huang, Ip, E., Yue-Kai Huang, Ting Wang
• Format: Article
• Language: English
• Subjects: Applied sciences; Circuit properties; Digital signal processing; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Fiber optics; High speed optical techniques; Information, signal and communications theory; Integrated optics. Optical fibers and wave guides; Mobile backhaul; Multiplexing; next-generation; optical access; Optical and optoelectronic circuits; Optical fiber communications; Optical network units; Optical telecommunications; Optical transmitters; orthogonal frequency division multiple access (OFDMA); orthogonal frequency division multiplexing (OFDM); passive optical network (PON); Passive optical networks; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; terabit; Transmission and modulation (techniques and equipments); Wavelength division multiplexing; wavelength division multiplexing (WDM)
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2011.2173905

Next-generation optical access networks are envisioned to evolve into a converged, high-speed, multiservice platform supporting residential, business, mobile backhaul, and special purpose applications. Moreover, bandwidth demand projections suggest that terabit aggregate capacity may need to be reached in such next-generation passive optical networks (PON). To satisfy these requirements while leveraging the large investments made in existing fiber plants, a wavelength division multiplexed (WDM)-based long-reach PON architecture combined with a multiple access technology that features a passive last-mile split, large per-λ speeds, and statistical bandwidth multiplexing can be exploited. In this paper, the first terabit PON based on hybrid WDM orthogonal frequency division multiple access (OFDMA) technology is proposed and experimentally verified. To enable high-speed, long-reach transmission with simplified optical network unit (ONU)-side digital signal processing, multiband OFDMA with ONU-side sub-band selectivity is proposed. Design challenges and tradeoffs between analog and digital domain sub-band combining and selection are also discussed. Finally, the experimental setup and results of the first 1.2 Tb/s (1 Tb/s after overhead) symmetric WDM-OFDMA-PON over 90 km straight single-mode fiber and 1:32 passive split, featuring multiband OFDMA, digitally selective ONUs, and a coherent-receiver OLT are presented and analyzed. By supporting up to 800 ONUs with 1.25/10 Gb/s guaranteed/peak rates and exhibiting a record rate-distance product achieved in long-reach PON, the demonstrated architecture may be viewed as promising for future converged terabit optical metro/access.