Throughput Performance Evaluation of Multiservice Multirate OCDMA in Flexible Networks

\u3cp\u3eIn this paper, new analytical formalisms to evaluate the packet throughput of multiservice multirate slotted ALOHA optical code-division multiple-access (OCDMA) networks are proposed. The proposed formalisms can be successfully applied to 1-D and 2-D OCDMA networks with any number of user classes in the system. The bit error rate (BER) and packet correct probability expressions are derived, considering the multiple-access interference as binomially distributed. Packet throughput expressions, on the other hand, are derived considering Poisson, binomial, and Markov chain approaches for the composite packet arrivals distributions, with the latter defined as benchmark. A throughput performance evaluation is carried out for two distinct user code sequences separately, namely, 1-D and 2-D multiweight multilength optical orthogonal code (MWML-OOC). Numerical results show that the Poisson approach underestimates the throughput performance in unacceptable levels and incorrectly predicts the number of successfully received packets for most offered load values even in favorable conditions, such as for the 2-D MWML-OOC OCDMA network with a considerably large number of simultaneous users. On the other hand, the binomial approach proved to be more straightforward, computationally more efficient, and just as accurate as the Markov chain approach.\u3c/p\u3

A New Approach for Evaluating the BER of a Multirate, Multiclass OFFH-CDMA System

In this letter, we propose a new approach to evaluate the bit error rate (BER) of a multirate, multiclass optical fast frequency hopping code-division multiple-access (OFFH-CDMA) system. This proposed approach does not require knowledge of the generated users' code sequences, which makes the system analysis straightforward. Furthermore, the presented formalism can also be successfully applied to most multi-weight multi-length family of codes, as long as the corresponding code parameters are employed.CAPESCAPESCNPqCNP

Co-channel interference reduction in Optical Code Division Multiple Access systems

In this thesis few new code sets and a multi-user interference (MUI) cancellation scheme have been proposed for Optical Code Division Multiple Access (OCDMA) systems, which can be employed in the next generation of global communication networks to enhance their existing systems’ performance dramatically. The initial evaluation of the proposed code sets shows that their implementation improves the performance, decreases the BER and increases security considerably. Also the proposed MUI cancellation scheme totally removes all the cross-talk and interference between the active users within the network. These novel schemes and codes can be easily implemented in the optical packet switched networks. Optical switching has the ability of bandwidth manipulation at the wavelength level (e.g. with optical circuit/packet/burst switching); the capability to accommodate a wide range of traffic distributions, and also to make dynamic resource reservations possible. This thesis first gives a brief overview of co-channel interference reduction in OCDMA networks, then proposes two novel code sets, Uniform Cross-Correlation Modified Prime Code (UC-MPC) and Transposed UC-MPC (T-UCMPC), along with their evaluation and analysis in various systems, including IP routing over an OCDMA network. Thereafter, the new MUI cancellation scheme is proposed and then the proposed code sets and the MUI cancellation scheme are implemented and analysed in a laboratory-based experimental test bed. Finally the conclusion of this research is discussed

Performance Comparison Of Hybrid 1-d Wdm/ocdma And 2-d Ocdma Towards Future Access Network Migration Scenario

In this paper, we provide a performance comparison and analysis between a hybrid 1-D WDM/OCDMA system and a 2-D WHTS OCDMA system. In the hybrid system, OOC is employed as users code sequence of the OCDMA dimension. The simulation results show that the hybrid system presents better performance than the 2-D WHTS OCDMA system, and show also that under a standard BER scenario, i.e., BER 10 9, the hybrid system can support at least 75% more simultaneous users than the 2-D OCDMA system for the analyzed case study. The analysis suggests that the hybrid 1-D WDM/OCDMA system is a qualified migration scenario since it can provide a smooth migration path from current networks towards OCDMA networks. © 2012 IEEE.Beyranvand, H., Salehi, J.A., Multirate and multi-quality-of-service passive optical network based on hybrid WDM/OCDM system (2011) IEEE Communications Magazine, 49, pp. 39-44Kitayama, K., Wang, X., Wada, N., OCDMA over WDM PON solution path to gigabit-symmetric FTTH (2006) J. Lightwave Technol., 24, pp. 1654-1662. , AprSanches, A.L., Dos Reis Jr., J.V., Borges, B.-H.V., Analysis of high-speed optical wavelength/time CDMA networks using pulse-position modulation and forward error correction techniques (2009) J. Lightwave Technol., 27 (22), pp. 5134-5144. , NovRaddo, T.R., Sanches, A.L., Dos Reis Jr., J.V., Borges, B.-H.V., A new approach for evaluating the BER of a multirate, multiclass OFFH-CDMA system (2012) IEEE Communications Letters, 16 (2), pp. 259-261. , FebYang, G.-C., Kwong, W.C., Performance comparison of multiwavelength CDMA and WDMA+OCDMA for fiber-optics networks (2002) Trans. of Communications, 45, pp. 1426-1434Shurong, S., Yin, H., Wang, Z., A new family of 2-D optical orthogonal codes and analysis of its performance in optical CDMA access networks (2006) J. Lightwave Technol., 24 (4), pp. 1646-1652. , AprYin, H., Richardson, D., (2007) Optical Code Division Multiple Access Communication, p. 123. , Ed. SpringerWang, X., Wada, N., Hamanaka, T., Miyazaki, T., Cincotti, G., Kitayama, K., OCDMA over WDM transmission (2007) Proc. ICTON 2007, , Rome, Italy, July, paper Tu.B1.

An All-optical Ocdma Encoder With Simultaneous Signal Regeneration Based On Fiber Four-wave Mixing

A new all-optical optical code division multiple access encoder that simultaneously regenerates input signals is proposed and experimentally investigated. The device is based on a fiber four-wave mixing and experimental results show that eye penalties may be decreased up to 5.1 dB. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1024-1028, 2014 Copyright © 2014 Wiley Periodicals, Inc.56510241028Ramaswami, R., Sivarajan, K.N., Sasaki, G.H., (2010) Optical Networks: A Practical Perspective, , 3rd ed., Elsevier, Burlington, MAGnauck, A.H., Winzer, P.J., Optical phase shift keyed transmission (2005) J Lightwave Technol, 23, pp. 115-130Winzer, P.J., Essiambre, R.-J., Advanced Optical Modulation Formats (2006) Proc IEEE, 94, pp. 952-985Raddo, T.R., Sanches, A.L., Dos Reis Jr., J.V., Borges, B.-H.V., A new approach for evaluating the BER of a multirate, multiclass OFFH-CDMA system (2012) IEEE Commun Lett, 16, pp. 259-261Galdino, L., Raddo, T.R., Sanches, A.L., Bonani, L.H., Moschim, E., Performance comparison of hybrid 1-D WDM/OCDMA and 2-D OCDMA towards future access network migration scenario (2012) International Conference on Transparent Optical Networks (ICTON)Yin, H., Richardson, D.J., (2007) Optical Code Division Multiple Access Communication NetworksTheory and Applications, , Tsinghua University Press, Beijing, ChinaTurkiewicz, J.P., All-optical OOK-to-QAM modulation format conversion utilizing parallel SOA-MZI wavelength converters (2012) Microwave Opt Technol Lett, 54, pp. 2429-2433Abbade, M.L.F., Fagotto, E.A.M., Braga, R.S., Fonseca, I.E., Moschim, E., Barbosa, F.R., Optical amplitude multiplexing through four-wave mixing in optical fibers (2005) IEEE Photon Technol Lett, 17, pp. 151-153Zhou, G.T., Xu, K., Wu, J., Yan, C., Su, Y., Lin, J.T., Self-pumping wavelength conversion for DPSK signals and DQPSK generation through four-wave mixing in highly nonlinear optical fiber (2006) IEEE Photon Technol Lett, 18, pp. 2389-2391Mishina, K., Nissanka, S.M., Maruta, A., Mitani, S., Ishida, K., Shimizu, K., Hatta, T., Kitayama, K., All-optical modulation format conversion from NRZ-OOK to RZ-QPSK using parallel SOA-MZI OOK/BPSK converters (2007) Opt Express, 15, pp. 7774-7785Abbade, M.L.F., Galdino, L., Ribeiro, N.S., Marconi, J.D., Bonani, L.H., Moschim, E., An all-optical OCDMA encoder with simultaneous signal regeneration based on cross-gain modulation in semiconductor optical amplifiers (2012) International Conference on Transparent Optical Networks (ICTON)Song, S., Allen, C., Demarest, K., Hui, R., Intensity-dependent effects on FWM in optic fibers (1999) J Lightwave Technol, 17, pp. 2285-2290Bogris, A., Syvridis, D., Regenerative properties of a pump-modulated four-wave mixing scheme in dispersion-shifted fibers (2003) J Lightwave Technol, 21, pp. 1892-1902Agrawal, G.P., (2001) Nonlinear Fiber Optics, , 3rd ed., Academic Press, Orlando, F