Development of a new code family based on SAC-OCDMA system with large cardinality for OCDMA network

Hussein, Thanaa; Aljunid, S. A.; Fadhil, Hilal A.; Ahmad, Robiah; Saad, Mohamad Naufal Mohamad

doi:10.1016/j.yofte.2011.04.002

Cited by 96 publications

(54 citation statements)

References 10 publications

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“…It is denoted by IN, or simply by I if the size is immaterial or can be trivially determined by the context. From the MD matrix design in [13] the rows determine the number of users (K). Notice that the association between code weight (W), code length (N) and number of subscribers (K) can be expressed as:…”

Section: B the MD Code Before And After Using The Techniquementioning

confidence: 99%

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New Technique for Suppression Four-Wave Mixing Effects in SAC-OCDMA Networks

Radhi¹,

Aljunid²,

Fadhil³

et al. 2013

IJACSA

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Abstract-A new technique invented for suppressing the FWM in SAC-OCDMA systems based on adding idle code at the sideband of the code construction to generate the virtual FWM power at the sideband of the signal, and then by subtracting these virtual FWM power from the original FWM power in the system and filtering the data part at the channel. This technique is applied for both SAC codes, Random Diagonal Code (RD) and Multi Diagonal Code (MD). Moreover, in terms of cost, the reported technique is considered a cost-effective as the LED light source is used to generate the sideband codes. The results showed that the FWM reduced approximately 25 dBm after using the technique. For example, in the RD code the FWM power at 40km fiber length and input power is 15 dBm using the SMF fiber type is approximately -55 dBm before using the technique, after using the technique at the same values of parameters the FWM power is approximately -90dBm. In other words, at the MD code the FWM power before using the technique is approximately -61 dBm, the same parameters values, however after using our technique the value of the FWM power is approximately -81dBm. However, These results gave impact on the Bit Error Rate (BER) also, for example the value of BER in the RD code at the input power -10dBm and 35km fiber length before using the technique is 1.6×10-23 and after using the technique the value of BER will become 4.05×10-28. In addition at the MD code the BER value before using the technique is 9.4×10-22 and after using the technique the value of BER is 7.4×10-31.

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Section: B the MD Code Before And After Using The Techniquementioning

confidence: 99%

“…The MD code presents more flexibility in choosing the W, K parameters and with a simple design to supply a large number of users [13]. After using the technique, the code construction of the MD will be change as we will explain below:…”

Section: B the MD Code Before And After Using The Techniquementioning

confidence: 99%

New Technique for Suppression Four-Wave Mixing Effects in SAC-OCDMA Networks

Radhi¹,

Aljunid²,

Fadhil³

et al. 2013

IJACSA

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“…MAI is the interference that is generated due to the simultaneous transmission of users, which reduces the signal-to-noise ratio (SNR) of the overall system. The effect of MAI is reduced by utilizing codes with fixed in-phase cross-correlation [1]. Another source of noise is the Phase Induced Intensity Noise (PIIN), which results due to the mixing of two uncorrelated light fields that has identical polarization, minimum self-intensity noise, same spectral property and equal intensity.…”

Section: Introductionmentioning

confidence: 99%

“…Another source of noise is the Phase Induced Intensity Noise (PIIN), which results due to the mixing of two uncorrelated light fields that has identical polarization, minimum self-intensity noise, same spectral property and equal intensity. Due to the PIIN, the spectrum is widened beyond maximum electrical bandwidth permissible, severely degrading the overall system performance [1]. The OCDMA system performance is limited by different noise sources such as Gaussian noise, shot noise, beat noise, thermal noise, dark current, PIIN, and multiple access interference (MAI) arising from other users.…”

Section: Introductionmentioning

confidence: 99%

Comparison of novel coding techniques for a fixed wavelength hopping SAC-OCDMA

Bhanja

Panda

2016

Photon Netw Commun

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The optical code division multiple access (OC-DMA), the most advanced multiple access technology in optical communication has become significant and gaining popularity because of its asynchronous access capability, faster speed, efficiency, security and unlimited bandwidth. Many codes are developed in spectral amplitude coding optical code division multiple access (SAC-OCDMA) with zero or minimum cross-correlation properties to reduce the multiple access interference (MAI) and Phase Induced Intensity Noise (PIIN). This paper compares two novel SAC-OCDMA codes in terms of their performances such as bit error rate (BER), number of active users that is accommodated with minimum cross-correlation property, high data rate that is achievable and the minimum power that the OCDMA system supports to achieve a minimum BER value. One of the proposed novel codes referred in this work as modified random diagonal code (MRDC) possesses cross-correlation between zero to one and the second novel code referred in this work as modified new zero cross-correlation code (MNZCC) possesses cross-correlation zero to further minimize the multiple access interference, which are found to be more scalable compared to the other existing SAC-OCDMA codes. In this work, the proposed MRDC and MNZCC codes are implemented in an optical system using the optisystem version-12 software for the SAC-OCDMA scheme. Simulation results depict that the OCDMA system based on the proposed novel MNZCC code exhibits better performance compared to the MRDC code and former existing SAC-OCDMA codes. The proposed MNZCC code accommodates maximum number of simultaneous users with higher data rate transmission,

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“…Recently, a multi-diagonal (MD) code [17] has been suggested for the SAC-OCDMA systems of large cardinalities. It is designed such that the cross-correlation effect can be zero.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of performance of a hybrid SAC-OCDMA system using dynamic cyclic shift code

H¹,

Aljunid²,

Fadhil³

et al. 2012

Ukr. J. Phys. Opt.

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Abstract.A hybrid subcarrier multiplexing (SCM) technique incorporating spectral amplitude coding and optical code division multiple access (SAC-OCDMA) technologies is investigated using both numerical and simulation methods. The hybrid SCM/SAC-OCDMA system combines the two above schemes in such a way that it is robust to multiple access interference and reveals much enhanced channel data rate. We improve the overall performance of the hybrid SCM/SAC-OCDMA system based on spectral amplitude coding to suppress a number of impairments and improve its sensitivity at a bit error rate of 10 -9 . As a result, the system suggested by us, which is based on a dynamic cyclic shift code, shows better performance when compared with the standard SAC-OCDMA systems employing the conventional code.Keywords: dynamic cyclic shift code, spectral amplitude coding -optical code division multiple access systems, phase induced intensity noise, modified quadratic congruence code, random diagonal code.

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Development of a new code family based on SAC-OCDMA system with large cardinality for OCDMA network

Cited by 96 publications

References 10 publications

New Technique for Suppression Four-Wave Mixing Effects in SAC-OCDMA Networks

New Technique for Suppression Four-Wave Mixing Effects in SAC-OCDMA Networks

Comparison of novel coding techniques for a fixed wavelength hopping SAC-OCDMA

Enhancement of performance of a hybrid SAC-OCDMA system using dynamic cyclic shift code

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