A multiple access scheme referred to as IDMA (interleave-division multiple-access) is combined with OCDMA (CDMA with orthogonal spreading sequences) to obtain a new hybrid multiple access scheme referred to as OCDMA/IDMA. The new scheme is shown to outperform IDMA for a sufficiently large number of users and asymptotically approaches single user performance even for a bit load of as high as 3.7...

Code pulses of a spectral amplitude coding/optical code division multiple-access (SAC/OCDMA) system are overlaid onto a multichannel wavelength division multiplexing (WDM) system. Modified quadratic congruence (MQC) codes are developed as the signature codes for the SAC/OCDMA system. The developed code is to avoid the overlapping between signals of both systems with no use of notch filters. In ...

As a scheme of multiple access, Optical Code Division Multiple Access (OCDMA) technology has many outstanding advantages such as large capacity, high security and excellent anti-interference ability, which make OCDMA a forefront topic of research in all-optic access networks. In this thesis, we introduce OCDMA technology in detail, especially 2-Dimensional (2D) OCDMA system. A novel signature c...

We present performance limits of the optical code-division multiple-access (OCDMA) networks. In particular, we evaluate the information-theoretical capacity of the OCDMA transmission when single-user detection (SUD) is used by the receiver. First, we model the OCDMA transmission as a discrete memoryless channel, evaluate its capacity when binary modulation is used in the interference-limited (n...

Optical code division multiple access system (OCDMA) has been important with increasing demands of high capacity and speed for communication in optical networks. Due to OCDMA technique high efficiency is achieved, hence fiber bandwidth is fully used . .In this paper we will focus on different codes i.e MD (Multi Diagonal ) FCC (Flexible cross correlation),DCS (Dynamic cyclic shift) code with BE...

We propose and experimentally demonstrate a novel architecture for interfacing and transmitting a Gigabit Ethernet (GbE) signal using asynchronous incoherent optical code division multiple access (OCDMA). This is the first such asynchronous incoherent OCDMA system carrying GbE data being demonstrated to be working among multi-users where each user is operating with an independent clock/data rat...

Recently, an alternative multiple access scheme was proposed by Li Ping. Its ability to separate the users accessing the common time and frequency resource is solely based on chip-level interleaving and it is therefore referred to as IDMA (interleavedivision multiple-access). Our contribution in this paper is to combine OCDMA (CDMA with orthogonal spreading sequences) with IDMA to obtain a new ...

In this paper we consider an optical code division multiple access (OCDMA) indoor wireless communication system using spectral encoding and evaluate its performances in cases of classical OCDMA, dynamic OCDMA and OCDMA with deconvolution. We present an analysis of the receiver movement influence on the indoor wireless communications system performances. As the receiver moves increasingly away f...

The demand for efficient optical communication systems has fuelled considerable research in developing techniques for eradicating phase-induced intensity noise (PIIN) in spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA). This paper investigates the use of modified-AND subtraction detection technique to mitigate PIIN in SAC-OCDMA systems. The simulation results show tha...

In this paper, we present the impact of an EDFA (Erbium Doped Fibre Amplifier) for high data rate in Spectral Amplitude Coding Optical Code Division Multiple Access (SAC-OCDMA) networks. A Single photodiode (SPD) detection structure for SACOCDMA system is presented. The SPD detection can be flexibly constructed for any weight and number of users by using a single photodiode. Several advantages ...