Upstream Transmission of WDM/OCDM-PON in a Loop-Back Configuration With Remotely Supplied Short Optical Pulses

Choi, Yong-Kyu; Hanawa, Masanori; Wang, Xu; Park, Chang‐Soo

doi:10.1364/jocn.5.000183

Cited by 10 publications

(3 citation statements)

References 18 publications

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“…To deal with the limitations and inefficiency that arises from each system mentioned above, hybrid systems have been proposed. The hybrid system of optical CDMA-dense wavelength division multiplexing (optical CDMA/DWDM) combines the advantages and strengths of both multiplexing schemes [2,[4][5][6][7] but still suffers from limitations such as chromatic dispersion (CD), laser phase noise (LPN) and nonlinear effects as do all the previous systems. These limitations have a huge impact on the signal quality and degrade system performance.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of Different Modulation Formats for a 40 Gbps Hybrid Optical CDMA/DWDM System against ISI and FWM

2022

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This paper carries out a numerical simulation investigating three different modulation formats: carrier suppressed return to zero (CSRZ), modified duobinary return to zero (MDRZ) and return to zero (RZ). The purpose of this investigation is to find the optimum modulation format for the hybrid optical code division multiple accesses–dense wavelength division multiplexing (optical CDMA/DWDM) system with the implementation of an electro-optic phase modulator (EOPM) at a data rate of 40 Gbps per channel, with a transmitted power of 22 dBm and transmission distance of 105.075 km. The results revealed that CSRZ was superior to MDRZ and RZ and was more tolerant to optical fiber nonlinearity. Furthermore, unlike the DWDM systems, the performance of the proposed hybrid system based RZ format was better than the performance of MDRZ. Hence, the CSRZ modulation format is the best candidate for the optical CDMA/DWDM with EOPM module due to its high performance.

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Section: Introductionmentioning

confidence: 99%

Performance Comparison of Different Modulation Formats for a 40 Gbps Hybrid Optical CDMA/DWDM System against ISI and FWM

2022

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“…On the other hand, multiple access interference (MAI) is the big problem facing the researchers in optical CDMA area, which is caused by the overlapping signaling between the users. Few researches of hybrid systems have been [1][2][3][4][5][6][7][8]. However the effect of FWM has not been addressed yet.…”

Section: Introductionmentioning

confidence: 99%

Hybrid optical CDMA and DWDM system implemented under the influence of Non-linear effects

Alsowaidi

Eltaif

Mokhtar

2019

IJEECS

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<span>A hybrid optical CDMA-DWDM system accommodating 12 optical CDMA users carried by 5 DWDM wavelengths at a data rate of 60Gb/s/wavelength with channel spacing of 0.4nm is implemented under the effect of four-wave mixing (FWM). It was found that the FWM effect could be minimized by the use of CDMA technology, where the energy of each bit is spread over the optical sequence code. Over a distance of 105.075km, significant performance of all optical CDMA users in terms of the BER is achieved. The results reveal that the inter-symbol interference (ISI) can be mitigated when the interval of optical signature sequence code is squeezed into 25% of the bit duration. </span>

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“…They have adopted hybrid wavelength division multiplexing and optical code division multiplexing (WDM/OCDM) schemes in order to mitigate the blocking probability of OBS networks. In [5], Choi et al have proposed and experimentally demonstrated the upstream transmission of WDM/OCDM-PONs using low-cost devices. Out of the different types of OCDMA, spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) comes as a low-complexity and cost-effective candidate [6].…”

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confidence: 99%

Performance Analysis of SAC-OCDMA Systems Adopting Overlapping PPM Schemes

Shalaby

2013

J. Lightwave Technol.

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A fertile technique, for increasing single-user throughput while keeping a constraint on the light pulsewidth, is proposed for spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) systems. In this technique, two-level -ary overlapping pulse-position modulation ( -OPPM) scheme is adopted and each user is assigned two orthogonal code sequences to represent these two levels. The code sequences are selected from a minimum cross-correlation code set. The bit error rate (BER) of the proposed system is derived, taking into account the effects of phase-induced intensity noise, shot noise, and thermal noise in addition to the multiple-access interference. The BER performance of this system is compared to other systems adopting -PPM and OOK schemes under same pulsewidth constraints. Our results reveal that, while keeping the BER well below a prescribed threshold, the proposed -OPPM SAC-OCDMA system achieves higher transmission rate as compared to both -PPM and OOK SAC-OCDMA systems under same constraints. Specifically the transmission rate of a single user of the proposed system can be increased by about 34.44% as compared to traditional systems. Index Terms-Bit-error-rate (BER), modified prime sequence (MPS) codes, on-off keying (OOK), optical code-divisionmultiple access (OCDMA), overlapping pulse-position modulation (OPPM), pulse-position modulation (PPM), spectral-amplitude coding (SAC). I. INTRODUCTION O PTICAL CODE-DIVISION MULTIPLE-ACCESS (OCDMA) techniques are becoming competitive candidates for future optical communications networks [1]-[5]. Indeed, recently, many authors have proposed several frameworks for future optical networks adopting OCDMA techniques. For example in [1], Bhuiyan et al. have presented an analytical approach to the performance evaluation of turbulence induced fading on free space OCDMA communications systems. In [2], Tseng and Wu have adopted super perfect difference (SPD) code in compact spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) passive optical networks (PONs). In [3], Chang et al. have studied diversity OCDMA schemes in optical wireless communications systems. In [4],

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Upstream Transmission of WDM/OCDM-PON in a Loop-Back Configuration With Remotely Supplied Short Optical Pulses

Cited by 10 publications

References 18 publications

Performance Comparison of Different Modulation Formats for a 40 Gbps Hybrid Optical CDMA/DWDM System against ISI and FWM

Performance Comparison of Different Modulation Formats for a 40 Gbps Hybrid Optical CDMA/DWDM System against ISI and FWM

Hybrid optical CDMA and DWDM system implemented under the influence of Non-linear effects

Performance Analysis of SAC-OCDMA Systems Adopting Overlapping PPM Schemes

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