Title :
Unrepeatered optical transmission of 20 Gbit/s quadrature phase-shift keying signals over 210 km using homodyne phase-diversity receiver and digital signal processing
Author :
Ly-Gagnon, D.-S. ; Katoh, Kentaroh ; Kikuchi, Kazuro
Author_Institution :
Res. Center for Adv. Sci. & Technol., Univ. of Tokyo, Japan
Abstract :
Unrepeatered optical transmission of 20 Gbit/s quadrature phase-shift keying (QPSK) signals over 210 km, using a homodyne phase-diversity receiver followed by carrier-phase estimation through digital signal processing is demonstrated. The advantage of the coherent detection with phase estimation leads to significant improvement of the receiver sensitivity compared with differential demodulation. It also enables the observation of the distortion of the complex amplitude due to fibre nonlinearity, offering new tools to monitor the transmission quality.
Keywords :
digital signal processing chips; diversity reception; homodyne detection; nonlinear distortion; optical distortion; optical fibre communication; optical modulation; optical receivers; optical signal detection; phase estimation; quadrature phase shift keying; 20 Gbit/s; QPSK; amplitude distortion; carrier phase estimation; coherent detection; digital signal processing; fibre nonlinearity; homodyne phase diversity receiver; nonlinear distortion; quadrature phase shift keying signals; transmission quality monitoring; unrepeatered optical transmission;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20057967
