Title :
Linewidth-Tolerant Dual Polarization QAM Transmission System Using Twin Local Lights
Author :
Kawakami, Hiroto ; Kobayashi, Takayuki ; Miyamoto, Yutaka
Author_Institution :
NTT Network Innovation Labs., NTT Corp., Kanagawa, Japan
Abstract :
A novel digital coherent transmission system based on dual polarization quadrature amplitude modulation (DP-QAM) is proposed. In this system, a DP-QAM signal and twin local lights are generated from one continuous wave (CW) light source, and transmitted simultaneously. Because optical phase noise is canceled in the proposed receiver, linewidth tolerance is improved without using a coherent light source in the receiver. The proposed scheme successfully demodulates a 3.125-GBd DP-quadrature phase shift keying (i.e., DP-4-QAM) signal. After 50-km transmission, no degradation in bit error rate was observed even at the linewidth of 45 MHz.
Keywords :
error statistics; light sources; optical fibre communication; optical fibre polarisation; optical noise; optical receivers; phase noise; quadrature amplitude modulation; quadrature phase shift keying; CW; DP-4-QAM; DP-QAM signal; DP-quadrature phase shift keying signal; bit error rate; coherent light source; continuous wave light source; digital coherent transmission system; distance 50 km; dual polarization quadrature amplitude modulation; linewidth-tolerant dual polarization QAM transmission system; optical phase noise; receiver; twin local lights; Light sources; Optical fibers; Optical noise; Optical polarization; Optical pulses; Optical receivers; Optical fiber communication; Quadrature amplitude modulation; quadrature amplitude modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2466465
