DWDM, fiber optic high speed communication - · PDF fileDWDM, fiber optic high speed...
Transcript of DWDM, fiber optic high speed communication - · PDF fileDWDM, fiber optic high speed...
© ABB Group September 25, 2009 | Slide 1
ABB Telecom DWDM, fiber optic high speed communication
Kjell Arne Gjerde
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DWDM Agenda
DWDM technology
Products
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DWDM Technology
CWDM DWDM
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DWDM Technology
OA
OA
OA
OARaman 2p
293km
55.1dB
DCM120
Site A Site B
Raman 2pDCM120
DCM120
DCM120
DCM120
DCM120
OSC OSC
VOAVOA
Loss dB
Distance Km
Raman amplifier
Transmission direction
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DWDM Technology
The main challenge in the design is the distance – 300 Km without regeneration
Calculated attenuation is 55dB, and dispersion 6400 ps/nm
Power budget
Optical amplifier +13,5 dBm/per channel
Raman amplifier + 8 dB
Receiver sensitivity - 31 dBm
Total power budget 53,5 dB
Forward Error Correction + 5 dB
System power budget 57,5 dB
System margin (57,5-55) 2,5 dB
Adds 7% in bitrateWAN: 10 Gb/s=>10.7 Gb/sLAN:10.3 Gb/s => 11.1 Gb/s
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DWDM Technology
Since there are several amplifiers involved in the transmission chain, we need to look at not only attenuation, but also Optical Signal to Noise Ratio (OSNR)
Minimum OSNR set by the receiver is typically 10-15 dB
Signal level
Noise level
Noise level
Signal level
Noise level
Signal level
G G G
Psignal
Pnoise within 0.1 nm
OSNR=Psignal
Pnoise[dB]
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DWDM Technology
The dispersion affects the OSNR, and we must therefore use optical dispersion filters to counteract the effect
-680ps/nm (-40km)
+1190ps/nm (+70km)
+510ps/nm (+30km)
0ps/nm (0km)
+1020ps/nm (60km)
-510ps/nm (-30km)
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DWDM Technology
All types of fiber cable has different technical data according to IEC standards. A standard single mode fiber cable is usually of G.652 type
C-band L-band1500 1600
-5
10
20
D [ps/nm/km]
l [nm]
G.652
TW_RSLEAF
Fiber Types• G.652: Standard singlemode fiber, ~17-18ps/nm*km @ 1550nm.~0,19-0,20 dB/Km
• G.655: Non-zero dispersion shifted fiber (NZ DSF), ~3-6 ps/nm*km @1550nm. Examples Leaf (Corning), True wave (Lucent)~0,20 dB/Km
• G.654: submarine cable, ~20-21ps/nm @1550nm~ 0,18-0,19 dB/Km
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DWDM Technology
All subsea cables must be tested, and the masurement data used as design criteria for DWDM networks
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DWDM Technology
Backbone RoutersEdge Routers
Carrier Ethernet SwitchesPacket Transport Systems
WDM Layer
IP/Ethernet- based Data Switching Layer
Services Layer
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DWDM Technology
Multiple Traffic Channels on a Multiple Traffic Channels on a Single Fibre. Single Fibre.
Each channel transmitted on a different Each channel transmitted on a different ““colourcolour””. This prevents channels interfering, . This prevents channels interfering, and allows them to be separated at the far and allows them to be separated at the far
end. end. MultiMulti--service network!service network!
ATM ATM TxTx
STMSTM--16 16 TxTx
IP Router IP Router TxTx
4G FC 4G FC TxTx
10 GbE 10 GbE TxTx
DVBDVB--ASI ASI TxTx
FE FE TxTx
GbE GbE TxTx
ATM RxATM Rx
STMSTM--16 Rx16 Rx
IP Router RxIP Router Rx
4G FC Rx4G FC Rx
10 GbE Rx10 GbE Rx
DVBDVB--ASI RxASI Rx
FE RxFE Rx
GbE RxGbE Rx
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DWDM Technology
DWDM C-band
DWDM L-band
CWDM OutsideDWDM-band 30 dB
25 dB
20 dB
15 dB
g a
i n
Wavelengths standardized by ITU. •G.694.1 DWDM-spacings: 12.5GHz, 25GHz, 50GHz, 100GHz … (up to 40/80/100... λ)•G.694.2 CWDM-spacing: 20nm (up to 8 or 16 λ)
Coarse WDM (CWDM) : Lasers w/o temperature controlDense WDM (DWDM) : Lasers with temperature control
Optical Amplifier (EDFA) gain curve
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DWDM Products – Passive systems
Fiber-pair configurations:4+4 CWDM channels per fiber-pair.Point-to-point, bus networks.
Extension port can be used for CWDM or DWDM
half-sized units
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DWDM Products – Passive systems
Note! MDU’s work at 100GHz spacing SFP/XFP’s can be used!
Full-sized MDU’s (3-slot)Half-sized OIU
Fiber-pair configurations:
Up to 80 DWDM channels (C-band). Example: 80x 10G over 6x 23dB spans
40x 10G over 6x 26,5dB spans
Divided into odd and even 50GHz channels.
VOA integrated on MUX side.
SFP/XFP-based units can be used on even 50GHz channels !10G Tunable is used on odd 50GHz channels.
μROADM can be used for add/drop nodes.
80ch @ 50GHz @ C-band:
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DWDM Products
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DWDM Building blocks
Transponder Has client and line side interfaces, performs FEC and management, but only converts one signal at a time (regenerates the signal, and add overhead)Typically same rate at client and line port (approx)
MuxponderHas one line side, and several client ports, multiplexes (TDM) between different client ports, into the line signal interface.Typically has n times client port capacity on the line side, plus overhead (framing and FEC)
VOA – Variable optical amplifier (software configurable)OAD optical multiplexers (passive)Optical amplifiers (different types)Dispersion compensating unitsControl units (OSC – optical supervisory channel)
All units are installed as separate units in one subrack, there are only power and management in the backplane. All units functions independently of each other. We can therefore divide several wavelengths and interfaces independently in one chassis.Traffic is not affected by loss of control unit, or any other wavelengthsThe chassis support duplicated power
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DWDM Products
9xGbE/10G FEC MuxPonder9x GbE (TDM multiplex)iWDM framingDual Line ports FEC coding 1+1 Line protectionFull, transparent GbE pipesXFP on Line, SFP on ClientsEmbedded Management channels on line portsVLAN management support in client portsPM 15min/24h G.826GbE utilizationClient loop-back (far-end)
9xGbE/10G MuxPonder9x GbE (TDM multiplex) iWDM framingLine rate equal to 10GbE-LANFull, transparent GbE pipesXFP on Line, SFP on ClientsEmbedded Management channelsPM 15min/24h G.826GbE utilizationClient loop-back (far-end)
~25W Power consumption excl optics
~20W Power consumption excl optics
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DWDM Products
Double DGbE Transponder
Two individual DGbE Transponders, i.e. 2x(2xGbE) multiplexingiWDM framing at 2.5Gb/s embedded mgmt channels and PM4x Regen mode to extend network reachTransparent transport of GbE (optical/electrical) or 100Base-TPM 15min/24h G.826Client loop-back (far-end)Layer-2 feature: GbE utilizationBroadcast mode Layer-1 protection switching within 10ms
Example TM-101 /-102 node~6W Power consumption excl optics
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DWDM Products
4 individual Transponders, CWDM/DWDMAutomatic protocol recognitionTransparent 100Mb/s to 2.5Gb/sSFP Transceivers on client and line sideNo mgmt channelsBasic PM 15min/24h G.826Supports client/equipment protection(between Transponders within same unit, or
betweenTransponders on separate units within same
chassis)
Quad MultiRate Transponder
Also support for• DVB-SDI (270Mb/s & 1,485Gb/s)• DVB-ASI (270Mb/s)
Transparent 100Mb/s – 2.7Gb/sSTM-1, -4, -16 OC-3, -12, -48GbE, 100Base-T DVB-SDI, DVB-ASI1G FC, 2G FC, ESCON
SFP with BNC connector SFP with BNC connector
DIN 1.0/2.3 & BT Type 54 cable connectors.STM-1 electrical interface G.703, ES1, CMI encoded signal
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DWDM Products
MXP8
Real STM-16 Multiplexer Up to 8x STM-1Up to 4x STM-4Pointer processingVC-4 switchEmbedded Mgmt channelsSyncsource: trib, linePM 15min/24h G.826
Non SDH standard feature:OH-relay
Also support for Electrical SFP’s for STM-1DIN 1.0/2.3 & BT Type 54 cable connectors.STM-1 electrical interface G.703, ES1, CMI encoded signal
Example applications:
• Mobile Transmission Network.Collection of STM-1’s from base station clusters where DCC- channels are used for signaling.
• Collection of STM-1’ from DSLAM’s
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DWDM Products
4x2G5-MXP10G
STM-64 Multiplexer Up to 4x STM-16 on STM-64 or G.709 wrapperFEC in G.709 modePointer processingVC-4 switch (switch only on STM-16 level) Embedded Mgmt channels on lineEmbedded mgmt on clients Client protection Syncsource: trib, line, internalPM 15min/24h G.826SFP’s on clients, XFP on line
Non SDH standard feature:OH-relay
Embedded mgmt interconnect towards other SDH MXP units
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DWDM Products
Double 10GbE-LAN Transponder
Mgmt interconnect
Four operational modes: 1. Two individual Transponders2. Equipment protection (<20ms)
3. Single Transponder with line prot (<10ms)
4. Double regenerator
10GbE-LAN clientsProprietary framing, FEC Embedded mgmt channelsPM 15min/24h G.826Client Loop-back (near/far-end)XFP on Line & Client
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DWDM Products
EDFA Amplifiers
+ 10dBm single, Flat Gain + 17dBm single, dual+ 20 dBm single, dual + 20 dBm single, dual, Low Gain
1U pizza boxup to 250km, 50dB without intermediate sites
Raman Amplifiers
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DWDM Products
4 degree ROADM.
• Independent control of 40 wavelenghts @ 100GHz spacing• In-build VOA function. Each wavelength can independently be
• Blocked• Attenuated• Equalized
• Two-slot unit
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DWDM Products
Embedded Node Manager (ENM) Software resides in NE
Network commissioning
Web-based GUI or CLI
Sufficient to manage simple optical networks
Transmode Network Manager (TNM)
Client-server based optical networkmanager
Full-featured GUI
For complex optical networks (most operator networks)
GUI
Optical Network
Optical end-to- end circuits
TNMDatabase
Optical Circuit EngineTNM Server
FCAPS
Northbound Interfaces
Data collection layer
ENM GUI
TNM GUI
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DWDM Products
Rack layout from Starv – BP
TM3000
Raman amplifier
PDH/SDH multiplex
Patch panels
Typical power consumption @ 48 VDC is about 450W, maximum 800W per TM3000 chassis
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DWDM Example project – Skarv BP, Norway
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