10 research outputs found
SARDANA: an all-optical access-metro WDM/TDM-PON
A new optical access network, named “Scalable Advanced Ring-based passive Dense Access Network
Architecture” (SARDANA), is presented. It transparently integrates WDM metro and TDM PON access
technologies, implementing ring protection, 100 km reach and up to 1024 users served at 10 Gb/s, with
passive highly-shared infrastructure. The introduced innovations are hybrid ring/tree WDM/TDM Passive
Optical Network (PON) architecture; a resilient remote node (RN), which is distantly pumped from the
Optical Line Terminal (OLT); and a reflective ONU (Optical Network Unit); as well as an enhanced
Medium Access Control (MAC) protocol.Postprint (published version
Single and multi-channel 2R regeneration: an overview
Transparent All-Optical Regeneration and Wavelength Conversion in Dense Wavelength Division Multiplexing (DWDM) transmission systems are key issues to ensure the progress of the transparent networks and their actual implementation. In this paper recent progress of several All Optical 2R experimental systems focused on single and Multi-channel approaches will be reported. In particular will be analysed the implementation matters and the regeneration capabilities of several devices based on the exploitation of non-linear phenomena in several media: Semiconductor Optical Amplifier (SOA) and Optical Fibres in non linear regimes
SARDANA: an all-optical access-metro WDM/TDM-PON
A new optical access network, named “Scalable Advanced Ring-based passive Dense Access Network
Architecture” (SARDANA), is presented. It transparently integrates WDM metro and TDM PON access
technologies, implementing ring protection, 100 km reach and up to 1024 users served at 10 Gb/s, with
passive highly-shared infrastructure. The introduced innovations are hybrid ring/tree WDM/TDM Passive
Optical Network (PON) architecture; a resilient remote node (RN), which is distantly pumped from the
Optical Line Terminal (OLT); and a reflective ONU (Optical Network Unit); as well as an enhanced
Medium Access Control (MAC) protocol
SARDANA: an all-optical access-metro WDM/TDM-PON
A new optical access network, named “Scalable Advanced Ring-based passive Dense Access Network
Architecture” (SARDANA), is presented. It transparently integrates WDM metro and TDM PON access
technologies, implementing ring protection, 100 km reach and up to 1024 users served at 10 Gb/s, with
passive highly-shared infrastructure. The introduced innovations are hybrid ring/tree WDM/TDM Passive
Optical Network (PON) architecture; a resilient remote node (RN), which is distantly pumped from the
Optical Line Terminal (OLT); and a reflective ONU (Optical Network Unit); as well as an enhanced
Medium Access Control (MAC) protocol
Enhanced transmission techniques
Next generation Passive Optical Networks (ngPONs) that offer increased bandwidth and distance-reach to a higher number of customers may require some modifications in the network infrastructure and in the technology of its devices. Nevertheless, these changes should not require a significant increased cost nor upgrading complexity. Optical Network Units (ONUs) at customer premises of currently deployed PONs include a fixed laser at a non-controlled wavelength, launching the light into the upstream fibre or into a single fibre via a coarse WDM multiplexer. In future PONs, Wavelength division multiplexing (WDM) can be effectively used to upgrade the overall PON capacity in several ways. Thus, new generation ONUs may be wavelength-controlled, wavelength-tuneable or wavelength-agnostic. WDM allows superposing different TDMA PONs over the access fibre line. The number of wavelengths then corresponds to two times the number of TDMA PON systems. This solution offers desirable characteristics for an access infrastructure as the use of one single fibre for both upstream and downstream transmission reduces the network size and connection complexity
Enhanced transmission techniques
\u3cp\u3eNext generation Passive Optical Networks (ngPONs) that offer increased bandwidth and distance-reach to a higher number of customers may require some modifications in the network infrastructure and in the technology of its devices. Nevertheless, these changes should not require a significant increased cost nor upgrading complexity. Optical Network Units (ONUs) at customer premises of currently deployed PONs include a fixed laser at a non-controlled wavelength, launching the light into the upstream fibre or into a single fibre via a coarse WDM multiplexer. In future PONs, Wavelength division multiplexing (WDM) can be effectively used to upgrade the overall PON capacity in several ways. Thus, new generation ONUs may be wavelength-controlled, wavelength-tuneable or wavelength-agnostic. WDM allows superposing different TDMA PONs over the access fibre line. The number of wavelengths then corresponds to two times the number of TDMA PON systems. This solution offers desirable characteristics for an access infrastructure as the use of one single fibre for both upstream and downstream transmission reduces the network size and connection complexity.\u3c/p\u3
Research in optical burst switching within the e-Photon/ONe network of excellence
This paper presents a summary of Optical Burst Switching (OBS) research within the VI framework program e-Photon/ONe network of excellence. The paper includes network aspects such as routing techniques, resilience and contention resolution, together with burst switch architectures. On the other hand, we also discuss traffic analysis issues, Quality of Service (QoS) schemes, TCP/IP over OBS and physical layer aspects for OBS.Peer ReviewedPostprint (published version
Study of powder injection and dephosphorization processes for high chromium stainless steels
55.00; Translated from Chinese (Iron Steel (China) 1987 v. 22(4) p. 20-27)SIGLEAvailable from British Library Document Supply Centre- DSC:9022.06(BISI-Trans--26324)T / BLDSC - British Library Document Supply CentreGBUnited Kingdo
Research in optical burst switching within the e-Photon/ONe network of excellence
This paper presents a summary of Optical Burst Switching (OBS) research within the VI framework program e-Photon/ONe network of excellence. The paper includes network aspects such as routing techniques, resilience and contention resolution, together with burst switch architectures. On the other hand, we also discuss traffic analysis issues, Quality of Service (QoS) schemes, TCP/IP over OBS and physical layer aspects for OBS.Peer Reviewe
Demonstration of a remotely dual-pumped long-reach PON for flexible deployment
We propose and experimentally demonstrate a flexible
wavelength division multiplexing/time division multiplexing
network architecture for converged metro-access environment.
Entire passiveness in the fiber plant is achieved with remote
amplification in the signal distribution nodes along the metro
ring and in the power splitters of the local access tree. We assist
a traditional remote pumping scheme with a distributed pump
provided by the optical network units and demonstrate that loss
budgets beyond 30 dB can be supported. Data transmission of up
to 10 Gb/s is evaluated in different deployment scenarios, reaching
from a 78 km long reach rural to a dense 1:128 split/ urban
configuration with field installed fibers, including also worst case
resilience configurations.Peer Reviewe