Capacity of QAM SCM systems utilising optically linearised Mach-Zehnder modulator as transmitter

Author

Wilson, G.

Author_Institution

Lucent Technol., AT&T Bell Labs., Holmdel, NJ, USA

Volume

34

Issue

25

fYear

1998

fDate

12/10/1998 12:00:00 AM

Firstpage

2372

Lastpage

2374

Abstract

The limitation imposed by nonlinear distortion and Gaussian noise on the capacity of a subcarrier multiplexed system with quadrature amplitude modulated channels and an optically linearised Mach-Zehnder externally modulated laser transmitter is calculated. A typical system can support 140 6 MHz quadrature phaseshift keying channels (an aggregate bit rate of 1.4 Gbit/s) at 10^-9 bit error rate with a received power of -25 dBm or 300 64-QAM channels (8.9 Gbit/s) with a received power of -15 dBm

Keywords

Gaussian noise; Mach-Zehnder interferometers; channel capacity; digital communication; error statistics; intermodulation distortion; laser beam applications; linearisation techniques; optical fibre communication; optical modulation; optical transmitters; quadrature amplitude modulation; subcarrier multiplexing; 1.4 Gbit/s; 1.55 micron; 6 MHz; 64-QAM channels; 8.9 Gbit/s; BER; Gaussian noise; IMD; QAM SCM system capacity; QAM channels; QPSK channels; bit error rate; externally modulated laser transmitter; nonlinear distortion; optically linearised Mach-Zehnder modulator; quadrature amplitude modulated channels; quadrature phaseshift keying channels; subcarrier multiplexed system;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:19981695

Filename

743990