Title :
WDM Transmission of Single-Carrier 400G Based on Orthogonal OTDM 80-GBd PDM-8QAM
Author :
Junwen Zhang ; Jianjun Yu ; Fan Li ; Nan Chi
Author_Institution :
ZTE (Tx) Inc., Morristown, NJ, USA
Abstract :
We experimentally investigate the wavelength-division multiplexing (WDM) transmission of single-carrier 400G based on an orthogonal optical time-division multiplexed (orth-OTDM) 80-GBd polarization-division multiplexed (PDM) 8 quadrature-amplitude modulation (QAM) signal. The 80-GBd 8QAM signal is generated using the OTDM method based on two tributaries of time-domain orthogonal pulses with 40-GBd 8QAM signals. Full-band coherent detection is utilized with digital signal processing based on a single broadband receiver for the 80-GBd signals. The WDM transmission performance of single-carrier 400G signals within different channel grids and carrier spacing is also investigated. Finally, four 400G channels, each carrying an 80-GBd PDM-8QAM signal within 100-, 80-, and 75-GHz grids, are successfully transmitted over 1600-, 800-, and 400-km standard single-mode fibers with Erbium-doped fiber amplifier (EDFA)-only amplification below a pre-Forward error correction (FEC) bit-error rate (BER) of 2.4×10-2 (20% soft-decision FEC), respectively. The achieved spectral efficiency for the 400G channel can be 4, 5, and 5.33 bit/s/Hz, respectively.
Keywords :
channel spacing; erbium; forward error correction; optical fibre amplifiers; optical fibre communication; optical modulation; optical receivers; quadrature amplitude modulation; time division multiplexing; wavelength division multiplexing; 8 quadrature-amplitude modulation; 80-GBd polarization-division multiplexing; BER; EDFA; FEC; WDM transmission; bit rate 400 Gbit/s; bit-error rate; carrier spacing; channel grids; digital signal processing; distance 1600 km; distance 400 km; distance 800 km; erbium-doped fiber amplifier; frequency 100 GHz; frequency 75 GHz; frequency 80 GHz; full-band coherent detection; orth-OTDM; orthogonal OTDM 80-GBd PDM-8QAM; orthogonal optical time-division multiplexing; preforward error correction; single broadband receiver; single-carrier 400G; soft-decision FEC; spectral efficiency; time-domain orthogonal pulses; wavelength division multiplexing; Bit error rate; High-speed optical techniques; Optical fibers; Optical polarization; Optical pulses; Wavelength division multiplexing; 400G; OTDM; PM-8QAM; optical coherent communication; optical time-division multiplexed (OTDM);
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2015.2464101
