Title :
64-Tb/s, 8 b/s/Hz, PDM-36QAM Transmission Over 320 km Using Both Pre- and Post-Transmission Digital Signal Processing
Author :
Zhou, Xiang ; Yu, Jianjun ; Huang, Ming-Fang ; Shao, Yin ; Wang, Ting ; Nelson, Lynn ; Magill, Peter ; Birk, Martin ; Borel, Peter I. ; Peckham, David W. ; Lingle, Robert, Jr. ; Zhu, Benyuan Benyuan
Author_Institution :
AT&T Labs.-Res., Middletown, NJ, USA
Abstract :
We report the successful transmission of 64 Tb/s capacity (640 ×107 Gb/s with 12.5 GHz channel spacing) over 320 km reach utilizing 8-THz of spectrum in the C+L -bands at a net spectral efficiency of 8 bit/s/Hz. Such a result is accomplished by the use of raised-cosine pulse-shaped PDM-36QAM modulation, intradyne detection, both pre- and post-transmission digital equalization, and ultra-large-area fiber. We discuss in detail the digital modulation technology and signal processing algorithms used in the experiment, including a new two-stage, blind frequency-search-based frequency-offset estimation algorithm and a more computationally efficient carrier-phase recovery algorithm.
Keywords :
blind equalisers; channel capacity; digital signal processing chips; frequency estimation; quadrature amplitude modulation; spectral analysis; PDM-36QAM; bit rate 64 Tbit/s; blind frequency search; carrier-phase recovery algorithm; channel capacity; digital modulation technology; digital signal processing; distance 320 km; frequency 8 THz; frequency-offset estimation algorithm; intradyne detection; post-transmission digital equalization; pre-transmission digital equalization; spectral efficiency; Capacity; QAM; coherent; digital; fiber; modulation format; optical transmission; spectral efficiency;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2011.2105856
