Title :
Spectral Efficiency-Adaptive Optical Transmission Using Time Domain Hybrid QAM for Agile Optical Networks
Author :
Qunbi Zhuge ; Morsy-Osman, Mohamed ; Xian Xu ; Chagnon, Mathieu ; Meng Qiu ; Plant, David V.
Author_Institution :
Dept. of Electr. & Comput. Eng., McGill Univ., Montreal, QC, Canada
Abstract :
We report the transmission of time domain hybrid QAM (TDHQ) signals for agile optical networks. A continuous tradeoff between spectral efficiency and achievable distance by mixing modulation formats including QPSK, 8QAM, and 16QAM is demonstrated in two scenarios: 1) 28 Gbaud non-return-to-zero (NRZ) signal for fixed 50 GHz grid systems; 2) superchannel transmission at date rates of up to 1.15 Tb/s and spectral efficiencies of up to 7.68 b/s/Hz. The TDHQ signal is generated using high-speed digital-to-analog converters (DACs) at the transmitter, and low-complexity digital signal processing (DSP) is proposed for processing the TDHQ signals at the receiver. Moreover, the nonlinearity tolerance of hybrid QAM signals with different configurations is investigated.
Keywords :
adaptive optics; light transmission; optical information processing; optical transceivers; quadrature amplitude modulation; quadrature phase shift keying; 16QAM; 8QAM; DSP; QPSK; agile optical networks; frequency 50 GHz; high-speed digital-to-analog converters; low-complexity digital signal processing; mixing modulation; nonreturn-to-zero signal; receiver; spectral efficiency-adaptive optical transmission; superchannel transmission; time domain hybrid QAM signals; transmitter; Bit error rate; Digital signal processing; Optical fiber networks; Optical transmitters; Phase shift keying; Quadrature amplitude modulation; Agile optical network; coherent optical communication; digital signal processing; flexible transceiver; hybrid QAM; spectral efficiency;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2013.2271634
