The area of Optical Code Division Multiple Access (OCDMA) systems has received steadily growing interest in recent years [l-S]. OCDMA offers a number of attractive features for future local area networks including higher connectivity, asynchronous multiple-access and more flexible bandwidth management. Much of the increased activity in this area has resulted from improvements in Fiber Bragg Gra...

Multiple User Interference (MUI) considers the primary problem in Optical Code-Division Multiple Access (OCDMA), which resulting from the overlapping among the users. In this article we aim to mitigate this problem by studying an interference cancellation scheme called successive interference cancellation (SIC) scheme. This scheme will be tested on two different detection schemes, spectral ampl...

In this paper, we introduce the optimization of Bit Error Rate (BER) in parallel cancellation of multiple access interference (PIC) using a novel periodic optical encoder applied to fiber-to-the-X (FTTX) passive optical network (PONs) with a direct sequence optical code division multiple access (DS-OCDMA) system. The principle of this structure of receiver consists to reduce the output error in...

In this paper, the optimum transmits power for an optical code division multiple access (OCDMA) is analyzed at different data rates and transmission distance. We used Enhance Double Weight (EDW) codes as a signature address in designing the system because this code can accommodate more number of simultaneous users under considerable standard Bit-Error-Rate (e.g. ≤ 10). The induced EDW codes for...

The hybrid wavelength-division multiplexing and optical code-division multiple-access scheme for EPON (called WDM/OCDMA-EPON) is presented over fiber-to-the-home (FTTH) network. In this study, each ONU (optical network unit) group is assigned the maximal-length sequence (M-sequence) code which is popularly used for spectral amplitude coding in OCDMA network. Hence, the proposed scheme is suitab...

Considering a 2-Dimensional Optical Code Division Multiple Access (2-D OCDMA) system using spreading codes in both time and wavelength domains, we study in this paper the impact on the performance of one of the most predominant performance limitation which is beat noise due to the photo detection. The beat noise impact is correlated with the wellknown OCDMA limitation named Multiple Access Inte...

In this paper, an improved form of two dimensional optical orthogonal codes is introduced for optical CDMA system by using just six lasers. This new technique not only reduces the length of the code but also improves the bit error rate (BER) performance of the system. The uniqueness of this coding architecture is that the two adjacent codes are not only different by their time slots but have di...

Optical code division multiple access (OCDMA) allows signal to be transmitted in an asynchronous manner, and promises high flexibility and simplicity with considerable security. OCDMA harnesses an enormous bandwidth that provides high spectral utilization and efficiency to support multiple, simultaneous active users. However, this multiple access technique also has impairments such as multiple ...

We discuss two newly proposed multiple-access control (MAC) protocols for multirate optical code-division multiple access (OCDMA) networks. The first protocol is slotted ALOHA/optical fast-frequency-hopping code-division multiple access (S-ALOHA/OFFH-CDMA), and the second is round-robin receiver–transmitter/optical fast-frequency-hopping code-division multiple access (R3/OFFH-CDMA). Our main su...