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

Volume

31

Issue

15

fYear

2013

fDate

Aug.1, 2013

Firstpage

2621

Lastpage

2628

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2013.2271634

Filename

6549117