Advanced Techniques to Increase the Number of Users and Bit Rate in OCDMA Networks

Willner, Alan E.; Saghari, P.; Arbab, V.R.

doi:10.1109/jstqe.2007.903393

Cited by 13 publications

(5 citation statements)

References 56 publications

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“…The system shown in this work allows a completely uncoordinated multiple access, which provides a fixed throughput efficiency (30%) and a fixed delay given the number of users. This efficiency is similar or better than the shown in [6] without the need of CPM. Note that the CPM provides improved efficiency at the cost of a receiver that needs to operate at the chip rate instead of the bit rate.…”

supporting

confidence: 72%

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Demonstration of Uncoordinated Multiple Access in Optical Communications

Chan

Casado

Basak

et al. 2008

IEEE Trans. Circuits Syst. I

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Abstract-Though it promises high bandwidths, the optical medium is not popular in local area networks. This is because current optical networks do not offer the ease of use and setup that an uncoordinated multiple access network such as Ethernet offers. In this paper, we propose a novel nonlinear trellis code designed for multiple access among uncoordinated nodes in an optical communications system. This code has been shown to have an efficiency of 30%. We have implemented the codes on Xilinx FPGA's for a 6 user optical system, transmitting data on a single wavelength. The above system was set up using commercial off-the-shelf components and we demonstrated BER of < 10 09 for three users, each running at a channel rate of 2 Gbps. Demonstration of this system required the design of new channel codes, architectural optimizations for the implementation of the channel codes for high speed with limited resources and electrical/optical optimizations to realize the optical channel.Index Terms-High-speed architectures, multiple access network, nonlinear trellis code, optical network, uncoordinated access network.

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supporting

confidence: 72%

“…Although the synchronous case provides better spectral efficiency, it requires chip-wise and bit-wise global synchronization increasing the complexity [4], [5]. An asynchronous O-CDMA has been proposed in [6]. In that work an asynchronous OCDMA system using 2-D time/wavelength coding with code position modulation (CPM) is demonstrated.…”

mentioning

confidence: 99%

Demonstration of Uncoordinated Multiple Access in Optical Communications

Chan

Casado

Basak

et al. 2008

IEEE Trans. Circuits Syst. I

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“…In OCDMA, the multiplexing is accomplished by encoding each user's data bit with a unique codeword, which is the user's identifier [11]. The encoding procedure is followed by the modulation of a carrier and the transmission of the signal in the optical fiber.…”

Section: Principles Of Ocdma Modelingmentioning

confidence: 99%

Call-level Analysis of Hybrid WDM-OCDMA Passive Optical Networks with Finite Traffic Sources

Vardakas¹,

Logothetis²

2009

MIC ICT Research Journal

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Passive Optical Networks (PONs) are becoming a mature concept for the provision of enormous bandwidth to end-users with low cost. In this paper we study the call-level performance of two PON configurations: the OCDMA-PON and the Hybrid WDM-OCDMA PON. We propose analytical models for calculating connection failure probabilities (due to unavailability of a wavelength) and call blocking probabilities (due to the total interference on a call that may exceed a permissible threshold) in the upstream direction. The PONs are described/modeled by onedimensional Markov chains. Bysolving them, we derive recurrent formulas for the blocking probabilities. The proposed analytical models are validated through simulation; their accuracy was found to be absolutely satisfactory.

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“…Second, based on encoding method, time domain or frequency domain or both time-frequency domain used simultaneously [6]. Recently coherent OCDMA are receiving much more attention over incoherent OCDMA due to its superior performance and reduced Multiple Access Interference (MAI) effect [7], [8], [9], [10]. In coherent time spreading (TS) OCDMA, encoding is performed in the time domain.…”

Section: Introductionmentioning

confidence: 99%

Time domain OCDMA PON architecture for 2048 optical network units

Choudhary

Pawar

2015

2015 IEEE Bombay Section Symposium (IBSS)

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Optical code-division multiple access (OCDMA) is one of the alternatives to time-division multiple access (TDM) and wavelength-division multiple (WDM) access in passive optical network (PON) systems as in this multiple users can share the same channel at the same time by assigning different codes to each user. This paper presents basic architecture, working principle, advantage, and disadvantage of the OCDMA system in details. Next, Time domain OCDMA PON architecture for 2048 optical network units (ONUs) at 60 km reach at 2.5 Gb/s bit rate is proposed. The simulated model is investigated for different number of users and transmission distance in terms of BER and Q-factor. The result shows that the simulated model can support up to 2048 users with acceptable BER and Q-factor. Also, multi-access interference effect on proposed architecture is studied. The simulation is carried out using Optsim.

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Advanced Techniques to Increase the Number of Users and Bit Rate in OCDMA Networks

Cited by 13 publications

References 56 publications

Demonstration of Uncoordinated Multiple Access in Optical Communications

Demonstration of Uncoordinated Multiple Access in Optical Communications

Call-level Analysis of Hybrid WDM-OCDMA Passive Optical Networks with Finite Traffic Sources

Time domain OCDMA PON architecture for 2048 optical network units

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