Performance enhancement of spectral-amplitude-coding optical CDMA using pulse-position modulation

Smith, E.D.J.; Blaikie, Richard J.; Taylor, D.P.

doi:10.1109/26.718559

Cited by 264 publications

(166 citation statements)

References 32 publications

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“…The proposed single-weight integer lattice against previously reported MFH [2], MQC [2], and Hadamard code [1] in the presence of the phase induced intensity noise, the photodiode shot noise and the thermal noise is illustrated in Fig. 2.…”

Section: Performance Analysismentioning

confidence: 99%

“…T HE main factor of performance degradation in optical code-division multiple-access (CDMA) systems is the multi-access interference (MAI) [1]- [7]. In spectral amplitude-coding (SAC) systems [1]- [3], MAI is solely a function of the in-phase cross correlations among the address sequences (also known as signature sequences or spreading sequence or simply code sequences).…”

Section: Introductionmentioning

confidence: 99%

“…In spectral amplitude-coding (SAC) systems [1]- [3], MAI is solely a function of the in-phase cross correlations among the address sequences (also known as signature sequences or spreading sequence or simply code sequences). The existing balanced detection schemes for SAC systems, [3], require unipolar sequences having fixed in-phase cross correlation.…”

Section: Introductionmentioning

confidence: 99%

“…The existing balanced detection schemes for SAC systems, [3], require unipolar sequences having fixed in-phase cross correlation. Hadamard code, -sequence, modified quadratic congruence code (MQC) and modified frequency hopping (MFH) codes have been proposed for such applications [1]- [3]. None of them is suitable for multimedia applications with different quality-of-service requirements.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Weight Unipolar Codes for Multimedia Spectral-Amplitude-Coding Optical CDMA Systems

2004

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Abstract-A novel balanced detection scheme for multi-access interference cancellation in multimedia spectral-amplitude-coding optical code-division multiple-access system is proposed. The receiver is capable of handling both equal and unequal in-phase cross correlation of optical orthogonal codes. A novel class of constantlength variable-weight optical orthogonal codes able to support multimedia services with different quality-of-service requirements is proposed as well. The construction is based on the pairwise balanced designs, or more specifically, on an incidence structure defined on an integer sub-lattice.Index Terms-Integer lattices, multi-access interference (MAI), multimedia, optical code division multiple access (CDMA), optical orthogonal codes, pairwise balanced designs, spectral-amplitudecoding (SAC).

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Section: Performance Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-Weight Unipolar Codes for Multimedia Spectral-Amplitude-Coding Optical CDMA Systems

2004

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“…The focus on the development of OCDMA systems is to improve the cardinality, mitigate PIIN (Phase Induced Intensity Noise), as well as suppress MAI (Multiplied Access Inference). Many schemes has been proposed in accordance in the OCDMA system detection such as, frequency hopping [1,2], the time spreading [3][4], spectral amplitude coding (SAC) [5][6] and code of spatial [7]. To have a good OCDMA detection of a code sequence should have the minimum cross-correlation and maximum auto-correlation properties for maintenance.…”

Section: Introductionmentioning

confidence: 99%

Noise suppression system of OCDMA with spectral/spatial 2D hybrid code

et al. 2017

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Abstract. In this paper, we propose a novel 2D spectral/spatial hybrid code based on 1D ZCC and 1D MD where the both present a zero cross correlation property analyzed and the influence of the noise of optical as Phase Induced Intensity Noise (PIIN), shot and thermal noise. This new code is shown effectively to mitigate the PIIN and suppresses MAI. Using 2D ZCC/MD code the performance of the system can be improved in term of as well as to support more simultaneous users compared of the 2D FCC/MDW and 2D DPDC codes.

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Introduction to Optical Communications

Ghafouri‐Shiraz

Karbassian

2012

Optical CDMA Networks

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The invention of the solid state ruby laser (acronym for light amplification by stimulated emission of radiation) in May 1960 [1] and the He-Ne gas laser [2] in December 1960 has led to some wide-ranging and very significant scientific and technological progress. This so-called 'discovery of the century', followed by the first use of semiconductor lasers [3][4][5] in communications, heralded the start of optical communications. The laser provided a powerful coherent light source together with the possibility of modulation at high frequency, and this opened up a new portion of the electromagnetic spectrum with frequencies many times higher than those commonly available in radio communication systems. In addition the narrow beam divergence of the laser made enhanced free-space optical transmission a practical possibility.Since optical frequencies are of the order of 100 THz, and information capacity increases directly with frequency bandwidth, the laser potentially offers a few order of magnitude increase in available bandwidth compared with microwave systems. Thus, by using only a small portion of the available frequency spectrum, a single laser could, in principle, carry millions of telephone conversations or TV channels.With the potential of such wideband transmission capabilities in mind, a number of experiments [6] using atmospheric optical channels were carried out in the early 1960s. These experiments showed the feasibility of modulating a coherent optical carrier wave at very high frequencies. However, the high cost of development for all the necessary components, and the limitations imposed on the atmospheric channel by rain, fog, snow and dust make such high-speed systems economically unattractive. However, numerous developments of free-space optical channel systems operating at baseband frequencies were in progress for earth-to-space communications [7,8].It soon became apparent that some form of optical waveguide was required. By 1963, bundles of several hundred glass fibres were already being used for small-scale Optical CDMA Networks: Principles, Analysis and Applications, First Edition. Hooshang Ghafouri-Shiraz and M. Massoud Karbassian.

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Performance enhancement of spectral-amplitude-coding optical CDMA using pulse-position modulation

Cited by 264 publications

References 32 publications

Multi-Weight Unipolar Codes for Multimedia Spectral-Amplitude-Coding Optical CDMA Systems

Multi-Weight Unipolar Codes for Multimedia Spectral-Amplitude-Coding Optical CDMA Systems

Noise suppression system of OCDMA with spectral/spatial 2D hybrid code

Introduction to Optical Communications

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