Paper Info
Title
Optical Code-Division Multiplexing (OCDM) Networks Adopting Code-Shift Keying/Overlapping PPM Signaling: Proposal and Performance Analysis
Abstract
Optical code-division multiplexing (OCDM) systems use short pulses compared with bit-duration to achieve high transmission rate. The use of short pulses poses several problems as a result of group velocity dispersion (GVD), intersymbol interference (ISI) (due to avalanche photodiode (APD) buildup time), and receivers limited bandwidth. In this paper, an OCDM system employing code-shift keying (CSK) and overlapping pulse-position modulation (OPPM) signaling is proposed and theoretically investigated. By using CSK while maintaining same data rate, the chip duration can be increased to counteract the GVD effect in 2D OCDM systems. Moreover, by increasing the chip duration, the chip rate is decreased and the stringent requirement on receiver bandwidth is relaxed. In addition, using overlapping property in OPPM allows for further chip duration increase. We consider using correlation receivers with hard-limiters and APDs at the receiver side. The bit error probability (BEP) of the proposed system is derived taking into account the impacts of APD noise, thermal noise, GVD, ISI, and multiple-access interference (MAI). A performance comparison between OOK-, PPM-, OPPM-OCDM and the proposed system is carried out. Our results reveal that the use of CSK/OPPM-OCDM with data rate constraint allows the reduction of MAI, GVD and ISI effects with improved spectral efficiency.
Year
DOI
Venue
2015
10.1109/TCOMM.2015.2467372
IEEE Trans. Communications
Keywords
Field
DocType
Code division multiplexing,Optical switches,Optical receivers,Optical transmitters,Optical pulses,Noise
Receiver Bandwidth,Intersymbol interference,Computer science,Keying,Electronic engineering,Modulation,Chip,Spectral efficiency,Code division multiple access,Multiplexing
Journal
Volume
Issue
ISSN
63
10
0090-6778
Citations 
PageRank 
References 
1
0.37
9
Authors
4
Name
Order
Citations
PageRank
Ahmed E. Farghal120.74
Hossam M. H. Shalaby26720.64
K. Kato363.53
Ramesh K. Pokharel41814.49