Optical Code-Division Multiplexing (OCDM) Networks Adopting Code-Shift Keying/Overlapping PPM Signaling

Proposal and Performance Analysis

Ahmed E. Farghal, Hossam M.H. Shalaby, Kazutoshi Kato, Ramesh Pokharel

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Article number7192599
Pages (from-to)3779-3788
Number of pages10
JournalIEEE Transactions on Communications
Volume63
Issue number10
DOIs
Publication statusPublished - Oct 1 2015

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Group velocity dispersion
Multiplexing
Pulse position modulation
Intersymbol interference
Multiple access interference
Avalanche photodiodes
Bandwidth
Thermal noise
Limiters

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

Optical Code-Division Multiplexing (OCDM) Networks Adopting Code-Shift Keying/Overlapping PPM Signaling : Proposal and Performance Analysis. / Farghal, Ahmed E.; Shalaby, Hossam M.H.; Kato, Kazutoshi; Pokharel, Ramesh.

In: IEEE Transactions on Communications, Vol. 63, No. 10, 7192599, 01.10.2015, p. 3779-3788.

Research output: Contribution to journalArticle

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