Transmission transparency and potential convergence of optical network solutions at the physical layer for bit rates from 2.5 Gb·s-1 to 256 Gb·s-1

In this paper, we investigate optical network recommendations GPON and XG-PON with triple-play services in terms of physical reach, number of subscribers, transceiver design, modulation format and implementation cost. Despite trends to increase the bit rate from 2.5 Gb s1 to 10 Gb s1 and beyond, TDMPONs cannot cope with bandwidth requirements of future networks. TDM and WDM techniques can be combined, resulting in improved scalability. Longer physical reach can be achieved by deploying active network elements within the transmission path. We investigate these options by considering their potential coexistence at the physical layer. Subsequently, we analyse the upgrade of optical channels to 100 Gb s1 and 256 Gb s1 by using advanced modulation formats, which combine polarization division multiplexing with coherent detection and digital signal processing. We show that PDMQPSK format is suitable for 100 Gb s1 systems and PDM-16QAM is more beneficial at 256 Gb s1. Simulations are performed in the OptSim software environment

Full-Service MAC Protocol for Metro-Reach GPONs

“This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder." “Copyright IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.”An advanced medium access control protocol is presented demonstrating dynamic bandwidth allocation for long-reach gigabit-capable passive optical networks (GPONs). The protocol enables the optical line terminal to overlap the idle time slots in each packet transmission cycle with a virtual polling cycle to increase the effective transmission bandwidth. Contrasting the new scheme with developed algorithms, network modeling has exhibited significant improvement in channel throughput, mean packet delay, and packet loss rate in the presence of class-of-service and service-level differentiation. In particular, the displayed 34% increase in the overall channel throughput and 30 times reduction in mean packet delay for service-level 1 and service-level 2 optical network units (ONUs) at accustomed 50% ONU load constitutes the highest extended-reach GPON performance reported up to date.Peer reviewe

1.25 Gbit/s ITU-T G.984.2 burst-mode transimpedance amplifier without reset pins

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Automatic map-based FTTx access network design

Several mature and standardized optical access network technologies are available for network operators providing broadband services, being now in deployment phase; therefore cost estimation, business analysis, efficient deployment strategies, network and topology design issues for FTTx access networks play an increasingly important role regarding profitability and market success. In a competitive environment, techno-economic evaluation supports the optimal choice among available technologies. Even the tradeoff between future proof technical superiority and short term investment minimization requires a farseeing decision. In our point of view, cost estimation and techno-economic evaluation is strongly related to strategic network design: among others the uneven population density, irregular street system or infrastructure have significant impact on the network topology, thus the deployment costs as well. In order to deal with these aspects, a high-level, strategic network design is necessary that adapts to geospatial characteristics of the services area, providing accurate and detailed network information for the techno-economic evaluation [1]. We have developed a topology designer methodology that supprts the above requirements, providing (near) optimal topology of the fully or partially optical access network, based on the geospatial information about the service area: digital maps, existing infrastructure and subscriber database. Automatic topology design for large-scale service areas, with 10.000s of subsribers is a highly complex mathematical problem. The tough algorithms for a near optimal, yet efficient solution. The developed algorithms were evaluated regarding their speed and accuracy. Based on topology design results, a detailed and flexible techno-economic comparison is carried out, since the framework handles various broadband access network technologies, as presented in a case study. --Topology design,Strategic Design,Network planning,GIS,Map,Techno-economic,Cost estimation

Kajian Tekno Ekonomi Migrasi Jaringan Berbasis XDSL ke FTTx GPON di Daerah Perkotaan

Penelitian dan pengembangan teknologi dibidang telekomunikasi menghadapi tantangan utamayaitu meningkatnya kebutuhan bandwidth secara signifikan dari tahun ketahun. Permasalahan yang dihadapi di Indonesia saat ini adalah sebagian besar jaringan telekomunikasi broadband masih mengunakan DSL berbasis kawat tembaga sebagai media utama akses jaringan. Kondisi ini jika tidak diantisipasi oleh operator penyedia jasa jaringan telekomunikasi, memungkinkan terjadinya bottleneck ketika bertambahnya kebutuhan akan konvergensi layanan telekomunikasi seperti triple-play service. Oleh karena itu dibutuhkan suatu kajian tekno ekono mimigrasi jaringan akses untuk sebagai dasar pemilihan teknologi beserta aspek ekonominya yang dapat memenuhi tuntutan tersebut. Tujuan penelitian ini adalah melakukan kajian tekno-ekonomi terhadap migrasi jaringan DSL berbasis tembaga keteknologi jaringan FTTx GPON pada daerah perkotaan menggunakan metode STEM (Strategic Telecom Evaluation Model). Metode tersebut berbasis pada pembagian kelas densitas rumah tangga pada area tertentu menjadi empat kelas kepadatan yaitu; sangat tinggi, tinggi, sedang dan rendah. Dari hasil kajian diperoleh untuk daerah dengan kepadatan rumah tangga sangat tingi dan tinggi jaringan akses layak secara teknologi dan ekonomi untuk migrasi dari jaringan berbasis kabel tembaga kelayanan berbasis kabel optic FTTx GPON, untuk daerah dengan kepadatan sedang dilayani oleh dua teknologi yaitu VDSL dan GPON, sedangkan untuk daerah kepadatan rendah hanya dilayani oleh teknologi VDSL. Dengan demikian operator dapat menggunakan hasil kajian ini untuk mendukung pengambilan keputusan dalam rangka migrasi jaringan akses