Optical code division multiple access (OCDMA) is a promising multiple access scheme for next generation passive optical networks (NG-PON). It can afford subscribers with a flexible Gb/s bandwidth for the upstream. However, OCDMA suffers from multiple access interference (MAI) that significantly reduces the performance of the system. To alleviate the undesirable impact of the MAI, we propose a p...

Three novel classes of optical orthogonal codes (OOCs) based on combinatorial designs are proposed. They are applicable to both synchronous and asynchronous incoherent optical code-division multiple access (OCDMA) and compatible with spectral-amplitude-coding (SAC), fast frequency hopping, and time-spreading schemes. Simplicity of construction, larger codeword families, and larger flexibility i...

In this paper we consider a multiple access system with oversaturation of the channel by means of a combined OCDMA/OCDMA scheme with scrambled orthogonal bases. We investigate the performance and the associated maximum channel capacity (channel load) for uncoded BPSK modulation with binary valued chip sequences and optimum multiuser detection for spreading factor N = 4, 8, 16 and 32. It is foun...

Researchers of spectral-amplitude coding optical CDMA (SAC-OCDMA) have often suggested that code patterns affect signal-to-noise ratio (SNR) of the system. However, research that as the link between fibre nonlinearity and its impact on SAC pluses evolution is scant. Therefore, the aim of this paper attempts to explore how the deployment of nonlinearity compensation improves the system property....

In this paper, performance analysis of conventional spectral amplitude coding (CSAC) with hybrid (HSAC) for OCDMA system is investigated in local area network (LAN) environment. The CSAC is built based on arithmetic sequence with simple algebraic ways. The HSAC technique is used in which spectral amplitude coding (SAC) combined with wavelength division multiplexing (WDM) to effectively reduce m...

Classical Multi Wavelength Optical Orthogonal Code (MWOOC) constructions impose several conditions on the code parameters. These limit the Optical Code Division Multiple Access (OCDMA) system potentialities in terms of performance and practical implementation. In this paper, a modified MWOOC construction is used to overcome these limitations. Indeed, this method permits designing 2D codes with ...

A new method for realizing spectral phase optical code-division multiple-access (OCDMA) coding based on step chirped fiber Bragg gratings (SCFBGs) is proposed and the corresponding encoder/decoder is presented. With this method, a mapping code is introduced for the m-sequence address code and the phase shift can be inserted into the subgratings of the SCFBG according to the mapping code. The tr...

We simulate both the throughput and the delay of an experimental 7×622 Mbps SAC-OCDMA system. Our results reveal that the RT protocol performs better than S-ALOHA CDMA protocol and provides a 4.5 dB improvement.

P. Susthitha Menon Universiti Kebangsaan Malaysia Institute of Microengineering and Nanoelectronics 43600 UKM Bangi, Selangor, Malaysia Abstract. The transmission of both optical code division multiple-access (OCDMA) and wavelength division multiplexing (WDM) users on the same band is investigated. Code pulses of spectral amplitude coding (SAC)/optical code division multiple-access (CDMA) are o...

In this paper, we propose a new teletraffic model for the calculation of blocking probabilities in an Optical Code Division Multiple Access (OCDMA) Passive Optical Network (PON) supporting multiple service-classes of Poisson traffic. OCDMA is a promising candidate of PON configuration for the provision of moderate security communications with large dedicated bandwidth to each end user. The PON ...