Demonstration of SDN Enabled Dynamically Reconfigurable High Capacity Optical Access for Converged Services

Access and Metro Network Convergence for Flexible End-to-End Network Design [Invited]

“…This is accomplished by using a custom implemented physical layer operations, administration and maintenance (PLOAM) message used by the primary OLT to request the ONU to tune to a wavelength provisioned by the secondary OLT. We believe that the measured provisioning time of 225ms could be reduced by an optimized design of communication interfaces between the ONU FPGA and the tuneable components [27]. The results of our experiments are reported in Fig.…”

“…The three different types of traffic, 10G PON, 100G P2P and front-haul, were demonstrated simultaneously over a dynamically reconfigurable TDM-DWDM PON physical layer with an ODN capable of supporting 512 users and a total LR-PON reach of up to 100km [27]. The demonstrator also showed the capability of the system to support 40+40 channels in up and downstream directions.…”

“…It incorporates software defined networking (SDN) controlled Metro-Core nodes with a TDM-DWDM LR-PON connected to a primary core node, with a protection link to a secondary core node. More details on this experimental test-bed setup can be found in [2], [27]. By exploiting the dynamic allocation of DWDM channels, the LR-PON can support the convergence of a number of different user types and service demands, from residential users, which share a 10G PON channel, to business users, with options to rent dedicated 10G PON channels or high capacity 100G point-to-point (P2P) links.…”

“…In the network test-bed demonstrated in [27] the SDN controller architecture, implemented in Ryu, follows the open network foundation (ONF) architecture using three main interfaces: the application-controller plane interface (A-CPI) between the control plane and the application; the intermediate-controller plane interface (I-CPI) between the network orchestrator (NetO) and the access/core network controllers (NCs); and the device-controller plane interface (D-CPI) between the controllers and the physical devices [30]. The LR-PON protocol is a partial implementation of the XGPON standard, with the major differences being the longer distance and the higher split ratio supported.…”

“…The access NC alerts the Orchestrator, which provisions the protection path both on the access side, activating the dualhome link from the ONUs to a second MC node, and on the core side redirecting the data destined to MC node where the primary OLT resides towards the MC node where the backup OLT is located. An average service restoration time of 64ms has been measured for the protection mechanism, where backup OLTs are shared among PONs in an N:1 scheme [27]. On the other hand, in the DWA use case the provisioning time is measured when, in response to an increase in traffic demand, the Orchestrator instructs the core and the access NCs to provision the new path, according to its knowledge of the full end-to-end network topology and the ONU traffic is moved to a different PON channel.…”