Optical DP-High Order-QAM Transmission System for High-Speed Short Links Utilizing Copropagating Twin Local Lights

Hiroto KAWAKAMI  Takayuki KOBAYASHI  Yutaka MIYAMOTO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E99-B    No.8    pp.1799-1804
Publication Date: 2016/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015CCP0035
Type of Manuscript: Special Section PAPER (Special Section on Advanced Information and Communication Technologies and Services in Conjunction with Main Topics of APCC2015)
Category: Transmission Systems and Transmission Equipment for Communications
Keyword: 
QAM,  digital coherent detection,  phase noise,  linewidth,  

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Summary: 
A novel optical high order quadrature amplitude modulation (QAM) transmission system for high-speed short links is described. Dual-polarization (DP) QAM and twin local lights are generated from one light source in the system, and these lightwaves are simultaneously transmitted via standard single mode fiber. The receiver can be constructed simply because it does not require a coherent light source under wavelength control. The system enables a 3.1 Gbaud DP-16-QAM signal to be successfully demodulated after 80-km transmission without using an optical dispersion compensator. It also achieves high tolerance against phase noise in the signal light source.