High speed and secure optical CDMA-based passive optical networks

Yang, Chao‐Chin

doi:10.1016/j.comnet.2009.04.004

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…respectively, and the code weights are selected as the maximum values that satisfy both the Johnson bound and the condition in (2). Proper choice of both M k and γ k values to minimize BER is not straightforward.…”

Section: A Unconstrained Frame Lengthmentioning

confidence: 99%

Performance Analysis of Multirate Multiservice Optical CDMA Networks Adopting Overlapping PPM Signaling

Farghal

Shalaby

Kawasaki

2014

J. Lightwave Technol.

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In this paper, an optical code-division multiple-access (OCDMA) system employing overlapping pulse-position modulation (OPPM) is proposed to support multimedia services with different bit-rate and quality-of-service (QoS) requirements in OCDMA networks. Both wrapped OPPM (WOPPM) and unwrapped OPPM (UOPPM) are considered. The proposed system achieves multirate and multi-QoS transmission by using multilength variable-weight optical orthogonal codes (MLVW-OOCs) as signature sequences and using different values of OPPM modulation parameters. Furthermore, numerical analysis is performed for two different receiver structures, namely, correlation receivers with and without hard-limiters. In our analysis, the multiple-access interference (MAI) is considered as the main performance limiting factor. In addition, the performance of the proposed system is evaluated and compared to that of traditional OOK-OCDMA system. Our results reveal that under both pulsewidth and throughput constraints, the performances of the proposed WOPPM-and UOPPM-OCDMA systems are significantly superior to that of OOK-OCDMA system. Index Terms-Bit-error-rate (BER), code division multiple access (CDMA), multiple-access interference (MAI), ON-OFF keying (OOK), overlapping pulse-position modulation (OPPM), quality of service (QoS). I. INTRODUCTIONO PTICAL code-division multiple-access (OCDMA) has gained much attention as one of the promising multipleaccess technique for future optical-access networks [1]-[4]. This is mainly due to the attractive OCDMA features, such as full asynchronous entire optical channel sharing among multiple users without any waiting time, which results in low latency access and less transmission delay. In addition to simplified and distributed network control, secure data transmission, soft capacity on demand, bursty traffic, and the ability to support multimedia services differentiation at the physical layer [5], [6].Both on-off keying (OOK) and pulse-position modulation (PPM) have been commonly used as modulation techniques in Manuscript

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Section: A Unconstrained Frame Lengthmentioning

confidence: 99%

Performance Analysis of Multirate Multiservice Optical CDMA Networks Adopting Overlapping PPM Signaling

Farghal

Shalaby

Kawasaki

2014

J. Lightwave Technol.

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“…Shifted Prime (SP) codes for SAC OCDMA-based Passive Optical Network (PON) has been proposed in (Yang, 2009) with the combination of the WDM technique. A new family code for this system has been constructed and named WS-SP.…”

Section: Fig 1: Optical Cdma System Classificationsmentioning

confidence: 99%

“…A new family code for this system has been constructed and named WS-SP. In addition, since a bidirectional WDM-PON is used to connect the OLT and the ONUs, two SAC codewords for both downstream and upstream transmission are assigned (Yang, 2009). This leads to performance improvement since the arising noise during photo-detecting process is reduced.…”

Section: Fig 1: Optical Cdma System Classificationsmentioning

confidence: 99%

Optical Code-Division Multiple-Access and Wavelength Division Multiplexing: Hybrid Scheme Review

Ashour

Shaari

Menon

et al. 2012

Journal of Computer Science

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Problem statement: Hybrid Optical Code-Division Multiple-Access (OCDMA) and Wavelength-Division Multiplexing (WDM) have flourished as successful schemes for expanding the transmission capacity as well as enhancing the security for OCDMA. However, a comprehensive review related to this hybrid system are lacking currently. Approach: The purpose of this paper is to review the literature on OCDMA-WDM overlay systems, including our hybrid approach of one-dimensional coding of SAC OCDMA with WDM signals. In addition, we present an additional review of other categorios of hybrid WDM/OCDMA schemes, where codes of OCDMA can be employed on each WDM wavelength. Furthermore, an essential background of OCDMA, recent coding techniques and security issues are also presented. Results: Our results indicate that the feasibility of transmitting both OCDMA and WDM users on the same spectrum band can be achieved using MQC family code with an acceptable performance as well as good data confidentiality. In addition, the WDM interference signals can be suppressed properly for detection of optical broadband CDMA using notch filters. Conclusion: The paper provides a comprehensive overview of hybrid OCDMA-WDM systems and can be used as a baseline study for other scientists in the similar scope of research

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