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      Sleep-aware wavelength and bandwidth assignment scheme for TWDM PON

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          Abstract

          The energy efficiency and delay performance of PON are two inversely related phenomena. Higher sleep time of the Optical Network Units (ONUs) results in higher upstream (US) delays due to increased traffic queues during the ONU Asleep state. Although an efficient dynamic bandwidth and wavelength assignment (DWBA) scheme can decrease US delays by minimizing the bandwidth waste and improving the fairness of bandwidth distribution among the ONUs. However, the conventional DWBA schemes are not designed to work with cyclic sleep mode (CSM) and they keep on assigning bandwidth to ONUs even if the ONU is in Asleep state leading to wastage of bandwidth and degraded CSM performance. Therefore, in this work a sleep aware DWBA scheme for TWDM PON is presented to coordinate with CSM mode. It only assign bandwidth to Active ONUs during the guaranteed phase, surplus phase and excess phase allocation phases which minimizes the bandwidth waste and the bandwidth lost at the ONU end. The wavelength switching process is also improved by only considering the Active state ONUs to balance the traffic load on all the wavelengths. The simulation results support our claim as the SA-DWBA scheme on average achieves DWBA schemes due to up to 50% to 65% higher energy savings compared to other due to longer ONU Asleep times. However, the increased upstream delays of all the traffic classes in SA-DWBA scheme remain within the set delay limit of 50 ms.

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          Assessing ICT global emissions footprint: Trends to 2040 & recommendations

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                Author and article information

                Contributors
                rizwan.aslam@neduet.edu.pk
                waqarashraf@bzu.edu.pk
                Journal
                Opt Quantum Electron
                Opt Quantum Electron
                Optical and Quantum Electronics
                Springer US (New York )
                0306-8919
                1572-817X
                10 June 2021
                2021
                : 53
                : 6
                Affiliations
                [1 ]GRID grid.440548.9, ISNI 0000 0001 0745 4169, Department of Electronic Engineering, , NED University of Engineering & Technology, ; Karachi, Pakistan
                [2 ]Department of Computer Engineering, Bahuddin Zakariya University Multan, Multan, Pakistan
                [3 ]GRID grid.440414.1, ISNI 0000 0004 0558 2628, Department of Computer Engineering, , Abdullah Gul University, ; Kayseri, 38080 Turkey
                [4 ]GRID grid.31880.32, State Key Laboratory of Information Photonics and Optical Communications, School of Electronic Engineering, , Beijing University of Posts and Telecommunications, ; Beijing, 100876 China
                Article
                2955
                10.1007/s11082-021-02955-3
                8191718
                © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2021

                This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100010221, Higher Education Commision, Pakistan;
                Award ID: 1982
                Award Recipient :
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                © Springer Science+Business Media, LLC, part of Springer Nature 2021

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