Coherent optical QPSK intradyne system: concept and digital receiver realization

Author

Derr, Frowin

Author_Institution

Siemens AG, Munchen, Germany

Volume

10

Issue

9

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

1290

Lastpage

1296

Abstract

A receiver concept based on optical quadrature phase-shift keying (QPSK) and a digital realization of synchronous demodulation including phase synchronization is presented. To keep the signal processing bandwidth low a phase diversity receiver, called an intradyne receiver, with an orthogonal electrical demodulation is proposed. Basic principles of the synchronous orthogonal and digital demodulation are described. After the evaluation of the shot noise limit some aspects of the digital phase-locked loop (PLL) are presented. In a 100-Mb/s transmission system a receiver sensitivity of -51.6 dBm has been measured. The loss in relation to the shot noise limit of -66.3 dBm (18 photons/b) is mostly due to the low local laser power and the influence of the receiver input noise

Keywords

demodulators; digital communication systems; optical modulation; optical receivers; phase shift keying; phase-locked loops; 100 Mbit/s; QPSK; coherent optical QPSK intradyne system; digital phase-locked loop; digital receiver; intradyne receiver; optical quadrature phase-shift keying; orthogonal electrical demodulation; phase diversity receiver; phase synchronization; receiver sensitivity; shot noise limit; signal processing bandwidth; synchronous demodulation; Bandwidth; Demodulation; Laser noise; Optical receivers; Optical sensors; Optical signal processing; Phase locked loops; Phase noise; Phase shift keying; Quadrature phase shift keying;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.156881

Filename

156881