Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for Group-velocity dispersion compensation

Author

Tsukamoto, Satoshi ; Katoh, Kazuhiro ; Kikuchi, Kazuro

Author_Institution

Res. Center for Adv. Sci. & Technol., Univ. of Tokyo, Japan

Volume

18

Issue

9

fYear

2006

fDate

5/1/2006 12:00:00 AM

Firstpage

1016

Lastpage

1018

Abstract

We demonstrate unrepeated optical transmission of 20-Gb/s quadrature phase-shift-keying (QPSK) signals over a 200-km-long standard single-mode fiber (SMF) without using any optical dispersion compensator. By employing optical homodyne detection, which can restore the entire information of the complex amplitude of the transmitted signal, group-velocity dispersion (GVD) of the SMF can be compensated electrically by a linear equalizer at the receiver. From off-line bit-error-rate measurements, we find that a simple transversal filter implemented in digital signal processing circuits after homodyne detection can effectively cancel the fiber GVD of up to 4000 ps/nm, enabling successful 20-Gb/s QPSK transmission.

Keywords

error statistics; filtering theory; homodyne detection; optical fibre communication; optical fibre dispersion; optical receivers; quadrature phase shift keying; signal processing; 20 Gbit/s; 200 km; complex amplitude; digital processing; digital signal processing circuits; group-velocity dispersion compensation; homodyne-detected signal; linear equalizer; off-line bit-error-rate measurements; optical homodyne detection; optical quadrature phase-shift-keying; optical receiver; phase-shift-keying signal; standard single-mode fiber; transversal filter; unrepeated optical transmission; Equalizers; Optical detectors; Optical filters; Optical receivers; Optical signal processing; Phase shift keying; Quadrature phase shift keying; Signal processing; Signal restoration; Transversal filters; Coherent receiver; group-velocity dispersion (GVD); optical communications;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2006.873501

Filename

1621262