ZTE

ZTE Communications ›› 2012, Vol. 10 ›› Issue (4): 39-44.

• Research Paper • Previous Articles     Next Articles

Terabit Superchannel Transmission: A Nyquist-WDM Approach

Hung-Chang Chien1, Jianjun Yu2, Zhensheng Jia2, and Ze Dong1   

  1. 1. Optics Lab, ZTE USA Inc., Morristown, NJ 07960, USA;
    2. ZTE Corporation, Shenzhen 518057, P. R. China
  • Received:2012-04-01 Online:2012-12-25 Published:2012-12-25
  • About author:Hung-Chang Chien (chien.hungchang@zteusa.com) received his BS and MS degrees in electrical engineering from National Cheng Cheng University, Taiwan, in 1999 and 2001. He received his PhD degree in electro-optical engineering from National Chiao Tung University, Taiwan, in 2006. From 2007 to 2011, he was a research engineer in the School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA. He is currently a senior member of technical staff at Optics Labs, ZTE USA Inc., Morristown, NJ. Dr. Chien has authored and co-authored more than 100 journal papers and conference proceedings and holds one U.S. patent with nine others pending in the fields of coherent DWDM optical transmission, microwave photonics, and passive optical networks.

    Jianjun Yu (yu.jianjun@zteusa.com) received his PhD degree in electrical engineering from Beijing University of Posts and Telecommunications in 1999. From June 1999 to January 2001, he was an assistant research professor at the Research Center COM, Technical University of Denmark. From February 2001 to December 2002, he was a member of the technical staff at Lucent Technologies and Agere Systems, Murray Hill, NJ. He joined Georgia Institute of Technology in January 2003 as a research faculty member and director of the Optical Network Laboratory. From November 2005 to February 2010, he was a senior member of technical staff at NEC Laboratories America, Princeton, NJ. Currently, he works for ZTE Corporation as the chief scientist on high-speed optical transmission and director of optics labs in North America. He is also a chair professor at Fudan University and adjunct professor and PhD supervisor at the Georgia Institute of Technology, Beijing University of Posts and Telecommunications, and Hunan University. He has authored more than 200 papers for prestigious journals and conferences. Dr. Yu holds 11 U.S. patents with 30 others pending. He is a fellow of the Optical Society of America. He is Editor-in-chief of Recent Patents on Engineering and an associate editor for the Journal of Lightwave Technology and Journal of Optical Communications and Networking. Dr. Yu was a technical committee member at IEEE LEOS from 2005 to 2007 and a technical committee member of OFC from 2009 to 2011.

    Zhensheng Jia (zhensheng.jia@zteusa.com) received his BE and MSE degrees in physical electronics and optoelectronics from Tsinghua University, Beijing, in 1999 and 2002. He received his PhD degree from Georgia Institute of Technology, Atlanta, in 2008. From 2002 to 2004, he worked as a research engineer on ultralong-haul optical links and backbone networks at the China Telecom Beijing Research Institute (CTBRI). From 2008 to 2011, Dr. Jia was a senior research scientist at Telecordia Technologies and worked on architecture of core optical networks and RF photonic signal processing. Currently, he is working on ultralong-haul optical transmission systems and optical transport architecture in the Optical Labs of ZTE USA. Dr. Jia has author or co-authored more than 100 peer-reviewed journal articles and conference papers. He is also an active reviewer for many technical publications. In 2007, he won the IEEE/LEOS Graduate Students Fellowship Award, and in 2008 he won the PSC Bor-Uei Chen Memorial Scholarship Award. In 2007, he won the 2011 Telcordia CEO Award.

    Ze Dong (dong.ze@zteusa.com) received his BS degree in electronic information science and technology from Hunan Normal University, Changsha, in 2006. He received his PhD degree in electrical engineering from Hunan University, Changsha, in 2011. From 2010 to 2011, he was a visiting scholar at Georgia Institute of Technology, Atlanta. He is currently a postdoctoral fellow in the School of Electrical and Computer Engineering, Georgia Institute of Technology. His research interests include broadband optical communication and optical coherent communications. Dr. Dong has authored and co-authored more than 35 journal papers and conference proceedings.
  • Supported by:
    This study is supported by National High Technology Research and Development Program of China (No. 2012AA011303).

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Abstract: In this work, we focus on enhancing the network reach in terabit superchannel transmission by using a noise-suppressed Nyquist wavelength division multiplexing (NS-N-WDM) technique for polarization multiplexing quadrature phase-shift keying (PM-QPSK) subchannels at different symbol-rate-to-subchannel-spacing ratios up to 1.28. For the first time, we experimentally compare the transmission reach of this emerging technique with that of no-guard-interval coherent optical orthogonal frequency-division multiplexing (NGI-CO-OFDM) on the same testbed. At BER of 2 × 10-3 and 100 Gbit/s per channel, an NGI-CO-OFDM terabit superchannel can transmit over a maximum of 3200 km SMF-28 with EDFA-only amplification, and an NS-N-WDM terabit superchannel can transmit over a maximum of 2800 km SMF-28 with EDFA-only amplification. Assuming different coding gain, 11 × 112 Gbit/s per channel with hard-decision (HD) forward-error correction (FEC) and 11 × 128 Gbit/s per channel NS-N-WDM transmission with soft-decision (SD) FEC can be achieved over a maximum of 2100 km and 2170 km, respectively. These are almost equal and were achieved using digital noise filtering and one-bit maximum likelihood sequence estimation (MLSE) at the receiver DSP. Characteristics including the back-to-back (BTB) curves, the ADC bandwidth requirement, and the tolerance to unequal subchannel power of an NS-N-WDM superchannel were also evaluated.

Key words: optical OFDM, Nyquist WDM, MLSE