Title :
Capacity of QAM SCM systems utilising optically linearised Mach-Zehnder modulator as transmitter
Author_Institution :
Lucent Technol., AT&T Bell Labs., Holmdel, NJ, USA
fDate :
12/10/1998 12:00:00 AM
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;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19981695
