DWDM, fiber optic high speed communication - · PDF fileDWDM, fiber optic high speed...

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© ABB Group September 25, 2009 | Slide 1 ABB Telecom DWDM, fiber optic high speed communication Kjell Arne Gjerde

Transcript of DWDM, fiber optic high speed communication - · PDF fileDWDM, fiber optic high speed...

Page 1: DWDM, fiber optic high speed communication - · PDF fileDWDM, fiber optic high speed communication Kjell Arne Gjerde ... DWDM Products – Passive systems Fiber-pair configurations:

© ABB Group September 25, 2009 | Slide 1

ABB Telecom DWDM, fiber optic high speed communication

Kjell Arne Gjerde

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© ABB Group September 25, 2009 | Slide 2

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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