Enhanced Performances of SAC-OCDMA System by Using Polarization Encoding

Abstract

This article presents a novel encoder technique of spectral amplitude coded multiple access (SAC-OCDMA) systems. The proposed technique is based on two orthogonal polarization states of the same one dimensional optical code. This method is usually applied to increase the number of simultaneous users in a network, and it can double the number of potential users against the one-dimensional code. The results obtained in this work show that optical zero cross-correlation code can accommodate more users simultaneously for the typical bit error rate of optical communication system of${\ }{10^{ - 9}}$.

Comparison the Performance Evaluation of Xgpon-Rof System with Wdm and Scm for Different Modulation Schemes

“…The system WDM-XGPON obtained a good results because the BER less than SCM-XGPON. The 64-QAM for WDM at 49 km the bit error rate less than 10-9 [10] acceptable level while the BER for 64-QAM for SCM less than 10-9 at 46 km. This variation of power received with fiber has been for three types of modulation 4-QAM, 16-QAM and 64-QAM shows in Figs.…”

“…The main objective of the RoF system is to distribute broadband signals to distributed base stations for wireless access using an optical access network [12]. The PON combination with RoF technology provides a high capacity solution and high data rate [10]. Waveform Division Multiplexing (WDM) The basic concept of WDM technology is to combine multi-channel optical with different wavelengths that come from different optical sources to a single fiber through multiple transmitters used on the sender side as well as multiplexer removal tools on the side of the receiver to split WDM channels [11].…”

Evaluation Performance of Two-Dimensional Multi-Diagonal Code Using Polarization and Wavelength of OCDMA System

“…The authors have used ZCC code with only single weight. The theoretical results of this article show that the 2D ZCC OCDMA of the proposed system can multiplex the double number of users in comparison to the 1D ZCC OCDMA system [3].…”

“…Hence, leading to much better BER performance. The balanced incomplete block design (BIBD) algorithm is used to construct 1D ZCC [3]. It is essential to note that the determination of number of users K is based on the following equation [9], [10]:…”

Performances of BICM-ID system using CRSC code in optical transmissions

“…For QPSK modulation, the demodulator needs to compute the log of the LLRs on the x 0 and x 1 coded bits for each symbol at the input. The L-value of the bit x 0 conditioned at the output of the adapted filter can be calculated as follows: [17], PIIN is eliminated [18], it is closely related to the MAI due to the overlapping of spectral from the different users [19,20], In the context of OWCs, noise is considered to be a combination of major factors, shot noise and interference noise, the dominant source of noise is the receiver thermal noise, which can be modeled as additive and Gaussian [21]…”