Feras N. Hasoon

Spectral amplitude coding OCDMA using and subtraction technique

An optical decoding technique is proposed for a spectral-amplitude-coding-optical code division multiple access, namely, the AND subtraction technique. The theory is being elaborated and experimental results have been done by comparing a double-weight code against the existing code, Hadamard. We have proved that the and subtraction technique gives better bit error rate performance than the conventional complementary subtraction technique against the received power level.

New Code Structure for Enhanced Double Weight (EDW) Code for Spectral Amplitude Coding OCDMA System

This paper presents a new structure for spectral amplitude coding optical code division multiple access systems based on the enhanced double weight (EDW) code. The new structure is based on mathematical model and step sequences. The reconstruction is carried for higher weighted code to build the code matrix by rules which will make high level weight inspection automatic sequenced and mathematically formed. Some simulation results are shown with comparison on performance.

Performance of OCDMA systems using a complementary subtraction technique

Feature Issue on Optical Code Division Multiple AccessWhat we believe to be a new code structure to reduce the multiple access interference in a spectral amplitude coding optical code-division multiple access system based on double-weight code families is proposed. Enhanced double weight (EDW) possesses ideal cross-correlation properties, and weight can be any odd number that is greater than 1. The theoretical analysis shows that EDW codes can more effectively suppress the phase-induced intensity noise and provide a significantly better performance compared with modified quadratic congruence and partial modified prime codes.

Optimum transmit power for optical CDMA transmission systems considering nonlinear stimulated Brillouin scattering (SBS) effects

The optimum transmit power for an optical code division multiple access (OCDMA) system based on enhanced double weight (EDW) code is evaluated for various transmission distances considering the nonlinear stimulated Brillouin scattering (SBS) effects. It has been observed through computer simulation that SBS causes backward scattering of transmit signal and this in turn causes a reduction of received power and limitation improvement for the bit error rate. It has been shown that the longer transmission distance have low Brillouin threshold power value and the power launched require must not excess the threshold power in order to overcome SBS effects. Also in this paper, we investigate and demonstrate how the attenuation coefficient and effective core area of optical fiber transmission influence the Brillouin threshold power in optical CDMA system.

Effects of Nonlinear Stimulated Brillouin Scattering on Performance Analysis of an Optical CDMA Transmission System

We conducted a computer simulation study to assess the effects of Stimulated Brillouin Scattering (SBS) on performance analysis of optical CDMA based on Enhanced Double Weight (EDW) code. It has been observed that SBS causes backward scattering of transmit signal and this in turn causes a reduction of received power and limitation improvement for the bit error rate. The maximum transmission distance is evaluated for optical CDMA based on BER equal to 10 -9 and transmitted power into fiber below SBS threshold power. Also in this paper, we demonstrate how the speed of data transfer, directly modulated technique and effective core area of optical fiber transmission influence the Brillouin threshold power in optical CDMA system.

New Algorithm for Enhanced Double Weight (EDW) Code for Spectral Amplitude Coding OCDMA System

This paper presents a new algorithm for enhanced double weight code (EDW-OCDMA). The original code uses a manual code generating method. Therefore it is very difficult to inspect the code for high weights, thus only small weights can be generated. The new algorithm provide mathematical formulas and step sequences to generate the code. This will lead to easily generate the code and in systematic manner. Especially for high code weights. The new method uses shifting. OCDMA simulation experiment is also presented in this paper to investigate the performance at higher code weights.

Performance of OCDMA system using and subtraction technique based on EDW code

In this paper we will present a full theoretical analysis for detection scheme proposed for spectral amplitude coding-optical code multiple access (SAC-OCDMA) system that using enhanced double weight (EDW) code, the detection scheme design based on the subtraction theory with new approach called AND subtraction technique. The theoretical analysis shows that EDW code can more effectively suppress the phase-induced intensity noise (PIIN) and provides a significantly better performance compared with Hadamard and Modified Frequency-Hopping (MFH) codes.

AND Subtraction Detection Scheme Performance Analysis Based On Enhanced Double Weight code

Signal to Noise Ratio (SNR) and Bit Error Rate (BER) equations were proposed for AND subtraction detection technique compatible with Spectral Amplitude Coding-Optical Code Division Multiple Access (SAC-OCDMA) system under Enhanced Double Weight (EDW) code, we analysis the system performance using the proposed equations for SNR and BER with respect of the number of users and describing the subtraction operation and its effect on the Multiple Access Interference (MAI) between the different channels. this paper shown that and subtraction technique under the EDW code can give a reliable Multiple Access Interference (MAI) cancellation and achieved better system performance with respect of numbers of users versus the other code like Hadamard and Modified Frequency Hopping (MFH).

New code structure for spectral amplitude coding in OCDMA system

A new code structure for spectral amplitude coding optical code division multiple access system based on Double Weight (DW) code families is proposed. The DW code has a fixed weight of two. Modified Double Weight (MDW) code possesses ideal cross-correlation properties and the weight can be any even number, which is grater than two. The MDW code possesses ideal cross-correlation properties and exists for every natural number n. Using the MDW code compared to the existing codes such as Hadamard and Modified Frequency-Hopping (MFH) codes canprovide a much better performance. This has been demonstrated from the experiment simulation.

Multi-Rate Transmissions on SAC-OCDMA System using New Enhancement Double-Weight (EDW) Codes

This paper presents a new code structure and its ability in supporting multiple transmission rates in point to point Spectral Amplitude CodingOptical Code Division Multiple Access (SAC-OCDMA) links. The Double-Weight (DW) code family that has a basic fixed weight of 2 was proposed. Enhancement Double Weight (EDW) Code is a DW code family variation that has variable weight of greater than one. The ability of EDW codes to support simultaneous transmissions at different bit rates is shown through simulated results of the bit error rate (BER) and the eye patterns. Three EDW encoded channels were used at the bit rates of 2.5Gbps and 10Gbps. EDW code shown here significantly performs better than Hadamard and Modified Frequency Hopping (MFH) codes