cours cwdm
DESCRIPTION
Cours CwdmTRANSCRIPT
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1Laser 2000 WDM short form tutorialHow to increase your bandwidth beyond
the 1300/1500 upgrade?
What about DWDM ?
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2Plan
Basics, WDM technology Passive optics Active componants CWDM amplifiers Applications Upgrade to DWDM Exemples of integration
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3Basics, WDM Technology
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4Standard optical network
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5Optical Network Basics
Two Fiber Rings for protection Unidirectional or bidirectional
Topology Ring (physically ring, logically point to point) Point to Point
Distance Link Budget Losses
Protection (failover in either direction) Transparency Scalability
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6Optical Link Budgets
Determining the Link Budget will get you the transmission distance (highly depend on your fiber loss)
Calculation Add Laser TX power to Rx Sensitivity of transceiver Subtract all points of signal loss Total equals Link Budget Transmission distance is Link Budget / 0.25 dB
attenuation (std @1550nm) per Km of fiber
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7Exemple of link budget calculation
1 5 1 0 n m O A D M
1 5 1 0 n mS F P
1 5 1 0 n m S F P
1 5 1 0 1 5 5 01 4 7 0 1 5 9 0
M U X / D E M U X - 4
1 4 7 0 n mS F P
1 4 7 0 n mS F P
1 4 7 0 n mO A D M
E q u i p m e n t
E q u i p m e n t
E q u i p m e n t
N O D E 2
N O D E 3
H E A D E N D
W E S T
E A S TE A S T
W E S T
W E S T
N E T
T x P o w e r = 0 d B
1 . 7 d B
1 . 5 d B 1 . 5 d B
0 . 5 d B 0 . 5 d B
0 . 5 d B
0 . 5 d B
R x s e n s i t v i t y = 2 4 d B
R x s e n s i t i v i t y + T x P o w e r 0 + 2 4 = 2 4 . 0 d B
M U X / D E M U X A d d I n s e r t i o n L o s s 1 . 7 d BO A D M D r o p P a s s T h r u L o s s 1 . 5 d BO A D M D r o p I n s e r t i o n L o s s 1 . 5 d BP a t c h P a n e l L o s s 2 . 0 d BN e t w o r k S p l i c e s 2 . 0 d BS i g m a 1 . 2 d B
M a r g i n 2 . 0 d B
L i n k B u d g e t = ( R x s e n s i t i v i t y + T x P o w e r ) - S i g n a l l o s s e s - M a r g i nL i n k B u d g e t = 2 4 d b - 9 . 9 d B - 2 . 0 d B = 1 2 . 1 d B
M a x i m u m t r a n s m i s s i o n d i s t a n c e = L i n k B u d g e t / a t t e n u a t i o n p e r K mM a x i m u m t r a n s m i s s i o n d i s t a n c e = 1 2 . 1 d B / 0 . 2 5 = 4 8 . 4 K m
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8When do you need CWDM ?
CWDM is used when you need more bandwidth inyour fiber. A cheap & easy solution could be to use 1300/1500 bidirectional transmissions (accessapplications, generally used for videotransmission) but you get limited in distances, datarate and flexibility.
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9What is the WDM technology ?
The Wavelength Multiplexing technology allows you togather different wavelengths coming from different fibersinto one fiber.
You have then the flexibility to add or drop eachwavelength at some points in the network.
In order to upgrade your system, you need to have dedicated emitters (lasers) and passive components that willdo the mutliplexing and demultiplexing. Those passivecomponents do not need power nor electronics and aretotally independant of the transmission protocol.
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Difference between CWDM andDWDM
In order to reduce cost, the standard Coarse WDM has been developped.
Each wavelength of the CWDM ITU grid has been definedas being 20nm apart from each other (from 1270nm to 1610nm) compared to the Dense WDM grid which stateswavelength spacing of 0.4nm (50Ghz), 0.8nm (100Ghz) and 1.6nm (200Ghz) (from 1525 to 1615nm).
The cost saving is both in the laser and the passivecomponents, plus in the management.
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CWDM to DWDM Comparisons
Cost CWDM 70% to 50% less than DWDM for the
components 3 to 5 times cheaper at the system management level
Standard applications CWDM: Metro Access, Enterprise DWDM: Metro Core, Metro Access (SONET)
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CWDM Q & A1. What is WDM ?
Ans: (1) CWDM:Coarse Wavelength Division Multiplexer
= 20 nm spacing, 4 ~8 Channel
(2) DWDM:Dense Wavelength Division Multiplexer
< 0,8 nm spacing, 8 Channels and above.
2. How many types of CWDM transmitting architecture exist ?
Ans: (1) Bi-Directional (both directions in one fiber)
(2) Uni-Directional (one direction per fiber)
3. What wavelengths are usually applied in CWDM solution?
Ans: (1) 4 Channel:1510,1530,1550,1570 nm
(2) 8 Channel:1470,1490,1510,1530,1550,1570,1590,1610 nm
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4. How does CWDM apply in Network Hierarchy ?
Ans: From Metro network to Access end.
5. What is difference between CWDM DFB and DFB Laser (DWDM)?
Ans: The requirement of temperature wavelength drift is different.
For normal CWDM, the temperature wavelength drift is
between -6 ~ 7.5 nm (uncooled DFB lasers instead of cooled ones)
ex : 1510 nm , operation temperature 0 ~ 70
In the case of 0 , temperature wavelength drift is 1510+(-6)=1504 nm
In the case of 70 ,temperature wavelength drift is 1510+7.5=1517.5 nm
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6. What is the operating temperature of CWDM?
Ans: 0 ~ 70
7. What is the production process of CWDM Passive components ?
Ans: (1) Fusion
(2) Thin Film Filter
8. What is the difference between MUX and DeMUX?
Ans: MUX: Optical passive component that combines wavelengthstraveling on separate fibers into single fiber.
DeMUX : Optical passive component that separates different wavelength from single fiber and routes them into different fibers.
1 1470nm
8 1610nm
CWDM
MUX
CWDM
DMUX
1
8
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Passive optics
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CWDM Passive Optics Specs
Insertion Loss MUX 2 3dB with coupler design DEMUX 2 4dB with filter design OADM pass through 2dB max
Isolation DEMUX - channel to adjacent channel 50dB MUX - channel to adjacent channel 8dB
Passband 12-14nm wide Ripple
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CWDM Passive Components
Available as modules or System solution
Available as modules or System solution
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Mux/Demux Plug-in Front Panel
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OADM Plug-in
The optical Add/drop allows to add and drop one channel or more to access dedicated customers
Available in 8 wavelengths Passive device, No power or electronics Both an east and a west transport path can be created for protection Used in a ring configuration with the MUX/DEMUX Plug-in
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Single lambda OADM diagram
RXTX
ToCWDM
SFP
TX TX RXRX
To NetworkTo NetworkCWDM OADM-1
RX
EAST WEST
ToCWDM
SFP
TX
Equipment Side
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Clip Mounting new technology
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Patch-Mux- New technology
Reduced package design
Mux/Demux directly put into a patchcord.
Dedicated to an easy upgrade
Ease Of Use
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Active components
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CWDM Transceiver Specs
Operate at data rates from 100 Mbps to 2.7Gbps DFB uncooled lasers in 16 wavelengths
1270nm to 1610nm at 20nm spacing
Receiver - PIN 20dB min, APD 30dB min TX power 0 to +1 dB min Available optical budget :
19dB, 23dB, 30dB
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Available in discrete components or in transceivers
1*9
GBIC
Coax
SFP- mini-GBIC
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How to implement them into yourlegacy network?
It could not be simpler : Just replace your standard product with a CWDM
(colored) GBIC or laser. Connect each one of them to the passive box . Repeat this operation on the other side of the line for the
demux. Done.
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CWDM amplifier
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LOA
Semi-conductor amplifer (different from the EDFAtechnology)
Small size Low cost Linear
Accommodates any data rate without crosstalk Handles multiple wavelengths without crosstalk Operates in switched networks without gain transients
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Mux / Demux elements create loss
SolutionTx
Tx
Tx
Tx
Transmitter Boost
Rx
Rx
Rx
Rx
Receiver preamplifier
Low cost unique CWDM amplifier
Insertion lossInsertion loss
Tx
Tx
Tx
Tx
CWDM Mux
Rx
CWDM Demux
Rx
Rx
Rxx km
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The Linear Optical Amplifier (LOA)
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CWDM Applications
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Point to Point Network
Carrier Hotel Site A
Finisar MUX
Carrier Hotel Site B
Finisar MUX
Switch Switch Switch Switch
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Point to Point operation
1 5 1 0 1 5 5 01 4 7 0 1 5 9 0 1 5 1 0 1 5 5 01 4 7 0 1 5 9 0
G B I C
E q u i p m e nt
E A S TW E S TN E TN E T
1 5 1 0 1 5 5 01 4 7 0 1 5 9 0 1 5 1 0 1 5 5 01 4 7 0 1 5 9 0G B I C
M U X / D E M U X - 4
E q u i p m e nt
E A S TW E S TN E TN E T
T x T x
T x
R x
R xR x T x
R x
S F P S F P
S F P S F P
M U X / D E M U X - 4
M U X / D E M U X - 4 M U X / D E M U X - 4
B u i l d i n g2
B u i l d i n g1
4 0 K m
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Ring Configuration
iMac
iMac
iMac
iMac
iMac
iMac
iMac
iMac
iMac
Carrier Hotel Site
Office Building B
Office Building A
Office Building C
Switch
Switch
Switch
FinisarOADM
FinisarOADM
FinisarOADM
Finisar MUX
Switch Switch
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Three Node Ring Operation
1 5 1 0 n m O A D M
1 5 1 0 n mS F P
1 5 1 0 n m S F P
1 5 1 0 1 5 5 01 4 7 0 1 5 9 0 1 5 1 0 1 5 5 01 4 7 0 1 5 9 0
S P A R E S P A R E
G B IC
M U X /D E M U X - 4 M U X /D E M U X - 4
1 5 5 0 n m O A D M
1 5 5 0 n mS F P
1 5 5 0 n mS F P
1 4 7 0 n mS F P
1 4 7 0 n mS F P
1 4 7 0 n m O A D M
E q u ip m e n t
E q u ip m e n t
E q u ip m e n t
E q u ip m e n t
N O D E 2
N O D E 1N O D E 3
H E A D E N DE A S TW E S T
E A S T
E A S T
E A S T W E S TW E S T
W E S T
N E TN E T
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Flexible Bandwidth Allocation Rate limiting features in
switch Allows each site to be
allocated the bandwidth that it requires
A higher density of sites can be supported on the ring
Bandwidth at each each site can be increased dynamically
Switch F
Switch A
Switch B
OADM
OADM
OADM
MUX/DEMUX
Switch X Switch Z
Switch C
OADM
Switch D
OADM
Switch E
OADM
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Upgrade to a DWDM network
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DWDM Key Transceivers Specs
DWDM APD GBIC Transceiver ITU Grid, 100Ghz, 28dB Link budget, 2.7Gbps, Low Power C Band ITU grid
Operate at rates from 100Mbps to 2.7Gbps DFB cooled lasers Receiver - APD 28dB min, 2.5Gbps TX power -3 or + 1 dB min FTR-1631-xx xx = channel number 17- 50 Digital Diagnostics for advanced monitoring
GBIC
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Scalability with DWDM on CWDM
1510nm 1530nm 1550nm 1570nm 1590nm 1610nm1490nm1470nm
1550.92nm1550.12nm1549.32nm1548.51nm1547.72nm 1551.72nm 1552.52nm
CWDM GRID20nm Spacing, 12nm Pass Band
DWDM GRID0.8nm Spacing
1553.33nm
The CWDMfilter widthallows 8DWDMchannels togo through
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DWDM on CWDM Node Exemple
1 5 5 0 n m O A D M
1 5 4 6 .9 2 1 5 4 7 .7 21 5 4 6 .1 2 1 5 4 8 .5 1
M U X /D E M U X - 4
C W D M O A D M N O D E
E q u ip m e n t
E A S TW E S T
N E T
1 5 4 6 .9 2 1 5 4 7 .7 21 5 4 6 .1 2 1 5 4 8 .5 1
M U X /D E M U X - 4N E T
D W D M M U X P a i r
1 5 4 6 .1 2G B IC
1 5 4 6 .9 2G B IC
1 5 4 7 .7 2G B IC
1 5 4 8 .5 1G B IC
1 5 4 6 .1 2G B IC
1 5 4 6 .9 2G B IC
1 5 4 7 .7 2G B IC
1 5 4 8 .5 1G B IC
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Exemples of integration
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Low Cost GigaBit Ethernet Metro Service
Service based on : L3 Switches from Cisco,
Foundry, Extreme and others
WDM GBICs Optical Add/Drop
Multiplexers CAT5 or MMF inside
buildings
Optical Add/Drop Mux, Single lambda
Ring SMF West Cable
Ring SMF East Cable
Layer 3
GBE Switch
CAT5 riser cables for local
service
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MMF or Twinaxcables for local
service
Optical Add/Drop Mux , Single O
Fibre ChannelSAN Fabric Switch
Ring SMF East Cable
Low Cost Fibre Channel Metro Service
Service based on : L3 Switches from
Brocade, MacData, Qlogicand others
WDM GBICs Optical Add/Drop
Multiplexers Twinax or MMF inside
buildings
Ring SMF West Cable
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Contact :Mathieu Husson
Laser 2000 France+33 (0)[email protected]
www.laser2000.fr