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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)