Title :
Analysis of beat noise in coherent and incoherent time-spreading OCDMA
Author :
Wang, Xu ; Kitayama, Ken-ichi
Author_Institution :
Dept. of Electron. & Inf. Syst., Osaka Univ., Japan
Abstract :
The effect of beat noise and other types of additive noise in time-spreading optical-code-division multiple-access (TS-OCDMA) networks is analyzed in this paper. By defining the coherent ratio kt, the ratio of the chip duration to the coherence time of the light source, TS-OCDMA systems are classified into incoherent, partially coherent, and coherent systems. The noise distributions and the bit-error rates are derived, and system performance is discussed for different cases. The performance of coherent systems is limited by the beat noise. With increasing kt, the effect of beat noise decreases in incoherent systems, and they eventually become free of beat noise. Possible solutions to the beat noise problem in coherent and partially coherent systems are also proposed and discussed.
Keywords :
code division multiplexing; error statistics; optical fibre networks; optical noise; beat noise; bit error rates; coherent OCDMA; incoherent OCDMA; noise distributions; optical networks; optical-code-division multiple-access; partially coherent systems; time-spreading OCDMA; Additive noise; All-optical networks; Bandwidth; Information systems; Multiaccess communication; Next generation networking; Optical fiber networks; Optical noise; Passive optical networks; Quality of service; Beat noise; CDMA; code-division multiple access; communication systems; optical networks;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2004.833267
