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8/10/2019 Redes Autonomas

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REDES DE SEGUNDAGENERACIN:CASO DE ESTUDIO

REDESAUTNOMAS:APLICACIONES DELWSS

REDES PTICASAUTNOMAS COGNITIVAS

The optical fiber network evolution is aiming to attend the

exponentially increasing new users demand scenario that requests

high bit rate and/or spectrum optimization use, mainly through the

network topology evolution, upgrading from point-to-point topology to

ring topology and full-mesh topology networks.

This evolution is being done by the development of new optical

devices and protocols that enhance optical network spectrum

optimization through the use of remote reconfigurability.

In such scenario, the evolution of the optical networks has brought

the so called cognitive autonomous optical networks. The main

feature of this networks is precisely the remote reconfiguration

capability in some of its optical devices.


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REDES PTICASAUTNOMAS COGNITIVASThe optical network reconfiguration it is directly related to the

emergence of Remote Optical Add/Drop Multiplexers (ROADMs).

With the use of ROADMs in the WDM optical networks, it was

possible to establish remote lightpaths configuration at bus, ring and

mesh network topologies, providing lightpath interconnectionbetween the nodes of these several topologies, and opening the

possibility to optimize the network spectrum utilization.

DATA PLANE

/PHYSICAL INFRASTRUCTURE

A central 4-degree node

ROADM and boundaries

3-degree node ROADMwith fiber pairs

interconnect the

ROADM nodes, and

each fiber span it is

constituted by 40 km of

SSMF (G.652) with a

EDFA booster amplifier

Today the main used technology for ROADMs is the Wavelength Selective

Switches (WSS) that enable bus, ring and mesh topologies, through N-degree

ROADMs. These ROADMs technologies enable the execution of optical

spectrum channel equalization at the ROADM output port due the per-channel

monitoring power and actuation on the respective variable optical attenuator

(VOA) inside the ROADM. Following an example: a 5 nodes mesh network.


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WDM NETWORK INTEGRATED WITH THE DCN(DATACOMMUNICATIONS NETWORKS)

Supervisory optical channel

multiplexer (SOM) and

supervisory optical channel

demultiplexer (SOD), which

multiplex/demultiplex the C-

band data channels with the

supervisory 1510 nm

channels are used for each

double fiber span

connection with the DCN.

Following, the mesh heterogeneous WDM network presented in previously,

integrated with the DCN (Data Communications Networks):

ROADM NODE ARCHITECTUREDEGREE 3

These nodes use flexgrid WSSs providing flexible channel spacing

granularity of multiples of 12.5 GHz slots. Fixed grid WSS (50 GHz

channel spacing) provide up to 80 channels, where flexgrid WSSs could

provide up to 320 channels (12.5 GHz channel spacing), which could more

optimize the optical network spectrum use.


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ROADM NODE ARCHITECTUREDEGREE 4

This node provides colorless and directionless characteristics due the useof two counterpost WSS to build an NxM WSS to manage the add/drop

connections. However due the use of fixed grid WSS configuration, the

ROADM could configure only 50 or 100 GHz channel spacing granularity

Counterpost NxM CD

WSS to provide colorless

and directionless

characteristics to the

ROADM add/drop

connections.

DIAGRAMA DETALLADO DE LA RED:


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OPTICAL SOFTWARE DEFINED NETWORKING

Graph networkabstraction

Legacy control planevirtualized (GMPLS)

Global networkmonitoring

Adaptive, cognitiveand autonomousperformanceoptimization

Specialized HW

Network operating

system communication

Network functions

and services

Communication

interfaces

SDN is revolutionizing networking, allowing switches to be virtualizedalong with storage and compute resources.

APPS ON TOP OF THE CONTROLLER (WSS) Constrained choices on the EDFA gain (NF,GF) WSS equalization for spectrum flatness

EDFA

WSS

ROADM


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APPS ON TOP OF THE CONTROLLER (WSS)

APPS ON TOP OF THE CONTROLLER (WSS)

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