Title :
Advanced Techniques to Increase the Number of Users and Bit Rate in OCDMA Networks
Author :
Willner, Alan E. ; Saghari, Poorya ; Arbab, Vahid R.
Author_Institution :
Univ. of Southern California, Los Angeles
Abstract :
Optical code-division multiple-access (OCDMA) systems have recently become a topic of interest for their potential application in access points and optical LANs. In this paper, we review OCDMA systems and their limitations, as well as various experimental techniques to increase the number of users and/or bit rate in a system or a network. These techniques include incorporating M-ary modulation formats, hard-limiting receiver, variable thresholding, and orthogonal polarizations as the third dimension. We also discuss some network limitations such as congestion collapse and near-far effect, and we investigate two techniques to overcome them: interference avoidance and missing chip detection.
Keywords :
code division multiple access; optical fibre LAN; orthogonal codes; M-ary modulation format; OCDMA networks; access points; congestion collapse; hard-limiting receiver; interference avoidance; missing chip detection; near-far effect; optical LAN; optical code-division multiple-access; optical orthogonal codes; orthogonal polarization; pulse position modulation; quality-of-service; variable thresholding; Bandwidth; Bit rate; Interference; Multiaccess communication; Optical modulation; Optical receivers; Passive optical networks; Pulse modulation; Quality of service; Wavelength division multiplexing; M-ary; Code; congestion collapse; interference avoidance (IA); optical code division multiple access (CDMA); optical orthogonal codes (OOC); polarization; pulse position modulation (PPM); quality of service (QoS); threshold; time–wavelength;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2007.903393
