Reconfigurable OADMs
Reconfigurable
OADM (ROADM)
Slide No. 1
Optical Networking Technologies TM
ROADM basic functions
 ROADM basic functions
– Add, Drop, Block or Attenuate any wavelength in any node – controlled by
remote management
– Power monitoring and equalization of any wavelength
– In Multi-Degree units every port can be configured for single wavelength or any
size band of waves.
 The result is:
Fully flexible transport networks
Hitless networks upgrades and changes
Full power monitoring and control
SAVE on spares
SAVE on OPEX
Fast time to market
Slide No. 2
Optical Networking Technologies TM
Static versus Reconfigurable OADM
Node 1
Fixed wavelengths
network
Node 5
Node 2
Node 3
Node 4
Node
8
Node
9
Node 1
Fixed OADM
Predefined
number of
channels in
each node
Non equal
channels power
levels at node
output.
ROADM
Any number and
type of waves
can be selected
in any node
Per channel
power level
equalization
and monitoring
ROADM Advantage
Network configuration Highest
flexibility. Future upgrades
do not disconnect the fiber.
OPEX savings.
Easy network design. Efficient
use of Optical Amplifiers
without the need for fixed
attenuators
Every node is
unique waves
configuration
Upgrades
requires
additional power
compensation
All nodes have
the same
equipment
All EDFAs are
deployed at the
initial stage
Savings on spares. Easy
network design.
In-service network upgrades
Tunable
network
Node 5
Node 2
Node 4
Slide No. 3
Node 3
Optical Networking Technologies TM
MRV ROADM Architectures
 LD1600 double “long” slot size modules. For East-West
configuration, 4 “long” slots are allocated for ROADM.
 2 degree (East-West only) 40 ports Mux/Demux – availability
Q4/2006
– Fixed wavelengths on filter ports (40)
– No multiplex fiber solution for ring-ring interconnect
 Multi-Degree (1x9 WSS switch) – availability Q2/2007
–
–
–
–
Slide No. 4
9 Add/Drop ports
eliminates add/drop filters
Fully tunable drop ports (single wavelength or multiplex section)
Enabler for ring to ring or mesh network designs
Optical Networking Technologies TM
LD1600-ROADM40 structure
1
2
3
1. 2 x 1 switch
2. VOA
3. Power Monitor
DROP
Slide No. 5
I=1….40
Insertion losses
COM IN-DROP = 11
ADD-COM OUT =8
COM IN-EXP OUT=2.5
EXP IN-COM OUT=12
Optical Networking Technologies TM
East-West ROADM system configuration
12db
8db
Slide No. 6
2.5db
11db
Optical Networking Technologies TM
Designing with 2-degree ROADM
-13dbm
+2dbm
+2dbm
ROADM
20db
-18dbm
ROADM
ROADM
ROADM
+2dbm
All channels
Are attenuated
To mach PassThrough
traffic
0dbm
•Every node looks the same and acts the same
•At each Booster Output ALL channels have the same +2dbm (due to 40 waves) power
Slide No. 7
Optical Networking Technologies TM