A 16-Channel Reconfigurable OCDMA/DWDM System Using Continuous Phase-Shift SSFBGs

Tian, C.; Zhang, Zhaowei; Ibsen, M.; Petropoulos, P.; Richardson, David J.

doi:10.1109/jstqe.2007.897668

Cited by 11 publications

(10 citation statements)

References 14 publications

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“…This led to good encoding efficiency and correlation performance. (Chang et al, 2005; Gold codes complex Shen and Weiner, 2001; Implementation Gao et al, 2010) Scheme 2Phase Random Codes OOK M-ary High security with ) complex implementation Scheme 3WHTS Prime-hop Codes OOK M-ary High security with complex Kiurvtso et al, 2007) Tian et al (2007) and Teh et al (2002), a reconfigurable optical OCDMA/dense WDM system based on quaternary phase coding gratings on some channels was demonstrated. They have employed a code-reconfigurable device for decoding based on the thermo-optic effect.…”

Section: Fig 1: Optical Cdma System Classificationsmentioning

confidence: 99%

Optical Code-Division Multiple-Access and Wavelength Division Multiplexing: Hybrid Scheme Review

Ashour

Shaari

Menon

et al. 2012

Journal of Computer Science

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Problem statement: Hybrid Optical Code-Division Multiple-Access (OCDMA) and Wavelength-Division Multiplexing (WDM) have flourished as successful schemes for expanding the transmission capacity as well as enhancing the security for OCDMA. However, a comprehensive review related to this hybrid system are lacking currently. Approach: The purpose of this paper is to review the literature on OCDMA-WDM overlay systems, including our hybrid approach of one-dimensional coding of SAC OCDMA with WDM signals. In addition, we present an additional review of other categorios of hybrid WDM/OCDMA schemes, where codes of OCDMA can be employed on each WDM wavelength. Furthermore, an essential background of OCDMA, recent coding techniques and security issues are also presented. Results: Our results indicate that the feasibility of transmitting both OCDMA and WDM users on the same spectrum band can be achieved using MQC family code with an acceptable performance as well as good data confidentiality. In addition, the WDM interference signals can be suppressed properly for detection of optical broadband CDMA using notch filters. Conclusion: The paper provides a comprehensive overview of hybrid OCDMA-WDM systems and can be used as a baseline study for other scientists in the similar scope of research

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Section: Fig 1: Optical Cdma System Classificationsmentioning

confidence: 99%

Optical Code-Division Multiple-Access and Wavelength Division Multiplexing: Hybrid Scheme Review

Ashour

Shaari

Menon

et al. 2012

Journal of Computer Science

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“…Each path from the coupler is reflected off a Fibre Bragg Grating (FBG) encoder which is used to apply the optical code corresponding to that particular channel. The FBG encoders apply 31-chip, 40 Gchip/s quaternary phase-shift keyed codes to the pulses [10]. The encoded channels passed through varying lengths of SMF fibre to ensure the data signals are uncorrelated and not mutually coherent while roughly overlapping in the time domain providing the worst case scenario in terms of MAI.…”

Section: A1241_1pdfmentioning

confidence: 99%

“…While a number of techniques for encoding/decoding the OCDMA signals have been experimentally demonstrated [3][4][5][6]10], nearly all techniques suffer from the phenomenon of Multiple Access Interference (MAI). MAI is generated when cross-correlation noise generated from the improper decoding of an optical signal is incident on an optical receiver.…”

Section: Introductionmentioning

confidence: 99%

“…This noise increases with the number of users transmitting data across the network, limiting the overall system performance. A number of techniques have been proposed for MAI suppression [7][8][9][10][11] however many of these methods require varying lengths of fibre, are polarization dependent, can introduce signal distortion or require a synchronized clock pulse and an additional nonlinear element. In this paper we demonstrate how the nonlinear optical-to-electrical conversion process of Two-Photon Absorption can be used for simultaneous optical thresholding and detection at the operating bit rate, in an OCDMA system.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Optical Thresholding in a 4-Channel OCDMA System via Two-Photon Absorption

Dexter

Reid

Barry

et al. 2009

Optical Fiber Communication Conference and National Fiber Optic Engineers Conference

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“…On the other hand, the response of each FBG is essentially fixed, with only slow thermal tuning possible (on the order of seconds). [20][21][22] Thus, we impose the constraint that FBG chips remain fixed across all MUBs, whereas the EOM waveforms are free to vary between them.For a given dimension d, we search numerically over all possible phase patterns to minimize the average meansquared error (MSE) between the actual and desired states, defined asThis provides a measure of closeness to the MUB condition for the d + 1 configurations (similar to previous "mubness" parameters 23 ). Following MATLAB optimization, we attain solutions for d = 2, 3, 4 with MSE = 1.05 × 10 −7 , 1.50 × 10 −4 , 1.60 × 10 −4 , respectively.…”

mentioning

confidence: 99%

Reconfigurable generation and measurement of mutually unbiased bases for time-bin qudits

Lukens

Islam

Lim

et al. 2018

Applied Physics Letters

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We propose a new method for implementing mutually unbiased generation and measurement of time-bin qudits using a cascade of electro-optic phase modulator -coded fiber Bragg grating pairs. Our approach requires only a single spatial mode and can switch rapidly between basis choices. We obtain explicit solutions for dimensions d = 2, 3, 4 that realize all d + 1 possible mutually unbiased bases and analyze the performance of our approach in quantum key distribution. Given its practicality and compatibility with current technology, our approach provides a promising springboard for scalable processing of high-dimensional time-bin states.Mutually unbiased bases (MUBs) are of fundamental importance in quantum mechanics. A collection of bases is called mutually unbiased if any eigenstate from one basis overlaps equally with all states from the other bases. Since a measurement result in one basis provides no predictive information about the outcome of a subsequent measurement in one of its mutually unbiased partners, 1,2 MUBs represent optimal choices for quantum state tomography in noisy environments 1,3 and guarantee security against eavesdropping in quantum key distribution (QKD). 4,5 Implementing MUBs experimentally can be challenging, especially in high-dimensional Hilbert spaces (dimension d > 2). For example, in time-bin encoding, the best known method for measuring states mutuallyunbiased with respect to single-time-bin wavepackets is to use nested delay interferometers (DIs). 6-8 This approach requires the use of d detectors and is difficult to scale to high d in a practical setting. Furthermore, passive DIs produce satellite pulses that reduce the probability of successful measurement to 1/d. 9,10 Therefore, a critical objective is to develop an approach for synthesizing time-bin MUBs that preserves single-spatial-mode quantum information processing, is rapidly reconfigurable, and enables measurements with high success probability. Here we propose and analyze a novel configuration for generating and measuring quantum photonic states prepared in various time-bin MUBs using a cascade of electro-optic phase modulator (EOM) -coded fiber Bragg grating (FBG) pairs (see Fig. 1). We find explicit solutions of (d + 1)-element MUB families for d = 2, 3, 4 and simulate performance of a multibasis QKD system. Importantly, our approach can be implemented using current technology and offers the first truly single-mode paradigm for time-bin MUBs. a) Electronic mail: lukensjm@ornl.gov IN OUT FBG 1 EOM 1 FBG N EOM N Time-Bin Transformation W UNIT CELL UNIT CELL FIG. 1. Proposed system. The input state propagates through a series of N unit cells, each comprising an EOM and coded FBG. Ideally the input-to-output path produces a one-to-one mapping between states from different bases.In our design, we impose the requirement that a physical configuration must transform between all MUBs available in a d-dimensional space. This criterion is motivated by high-dimensional QKD, as both increasing the dimension d and employing (d + 1)-basi...

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A 16-Channel Reconfigurable OCDMA/DWDM System Using Continuous Phase-Shift SSFBGs

Cited by 11 publications

References 14 publications

Optical Code-Division Multiple-Access and Wavelength Division Multiplexing: Hybrid Scheme Review

Optical Code-Division Multiple-Access and Wavelength Division Multiplexing: Hybrid Scheme Review

Nonlinear Optical Thresholding in a 4-Channel OCDMA System via Two-Photon Absorption

Reconfigurable generation and measurement of mutually unbiased bases for time-bin qudits

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