Testing of DWDM + CWDM high speed systems · and get End-to-End budget loss Use the C/DWDM OTDR to...
Transcript of Testing of DWDM + CWDM high speed systems · and get End-to-End budget loss Use the C/DWDM OTDR to...
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Christian Till
Technical Sales Engineer, EXFO
Testing of DWDM + CWDM high speed systems
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Need more bandwidth ?
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xWDM - Class of WDM Devices
WDM
CWDM
DWDM
Wavelength Division Multiplexing (WDM) :
Access
2 channels
1310nm, 1550nm
Coarse WDM (CWDM): MetroE, Mobile Backhaul
8 – 16 channels
Typical channel spacing 20nm
1271nm – 1611nm
Dense WDM (DWDM): Long haul, MetroE, RPHY
Up to 160 – 320 channels
Typical spacing: 0.4 nm
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Att
en
ua
tio
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dB
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]
Wavelength [nm]1280 1320 1360 1400 1440 1480 1520 1560 1600 1640
G.652, G.653 & G.655 Fibres
DWDM WINDOW1310 nm
O-Band E-Band S-Band C-Band L-Band
G.652.C & .DFibres
CWDM “Lower 8” WINDOW 1270nm – 1450nm CWDM “Upper 8” WINDOW 1470nm – 1610nm
DWDM = EDFA’s, nearly unlimited reach
CWDM ≠ EDFA’s, upper 8 attenuation ~ 0.25dB/km, reach ~80 km (20dB)
CWDM ≠ EDFA’s, lower 8 attenuation ~ 0.40 – 0.50dB/km, reach ~40 - 50 km (20dB)
xWDM - Class of WDM Devices
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CWDM – Metro Ethernet ring type
Head-End or CO
Fiber 1
Fiber 2
Passive
Components 1470nm
1510nm
1490nm
1550nm 1530nm
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Could turn up spare fibers if available
Could turn up lower 8 wavelengths
Higher attenuation - may not be able to reach customers
Non-uniform attenuation - loss budgeting more complex
Could overlay additional DWDM channels - “DWDM over CWDM”
DWDM channels more costly than CWDM channels
Big bandwidth potential…a.k.a. support many new customers
CWDM - More Than 8 Customers?
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Over 1531nm and/or 1551nm
DWDM over CWDM
Sacrifice 1 CWDM channel (1551nm) to insert 16 DWDM channels
Could also sacrifice 2nd CWDM channel (1531nm to add 8 – 16 more)
Serve up to 34
customers on 1 fiber
pair
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Cascaded Muxes
DWDM over CWDM
Cascade muxes to support even more customers
Many additional configurations possible
Up to 43
customers from
1 fiber pair
CWDM
DWDM DWDM
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What to look for during the construction?
Loss
Budget
MacrobendsConnector cleanliness
Power levels
IL
Splice and ConnectorLink ORL
Link Continuity
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© 2017 EXFO Inc. All rights reserved. 10
Fibers may impact your signals! Potential network problems: fibers may impact your signals!
Clean connectors
Dirty connectors Macrobends Fiber cuts / high loss
Clean fiber management
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CONNECTOR INSPECTION!WHY AUTO CENTERING?
© 2017 EXFO Inc. All rights reserved.
1stStep
TO ANY FIBER TESTING
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Muxes and Demuxes Are Wavelength Specific
Historical OTDRs and Light Sources Are Too Wide to “Fit” Through Filter Ports
Testing Challenges
CWDM Mux
1550nm ± 6.5nm
DWDM Mux
1550nm ± 0.25nm
Typical OTDR Center λ “1550nm” ± 20nm
Typical OTDR ∆λ = 10nm
Typical Light Source Center λ 1310nm or 1550nm
Typical Light Sources ∆λ = 5nm
Traditional tools won’t pass through filters
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CWDM Test ToolsFTB-740C CWDM OTDRs Make Testing Simple
Head-End or CO
Fiber 1
Tuning to “green”
finds break without
truck roll or
affecting other
services
What happens if break is here?
1 2
3
5 4
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xWDM Troubleshooting
Use the C/DWDM OTDR to validate continuity during construction through the MUX/DEMUX
and get End-to-End budget loss
Use the C/DWDM OTDR to troubleshoot from the head-end
In-service testing using the customer’s wvl port (ITU DWDM or CWDM)
Single-ended CWDM/DWDM fiber characterization in one box
ITU2
0
ITU21
D
CWDM+DWDM
modules
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© 2017 EXFO Inc. All rights reserved. 15
CHANGING THE WAY YOU TEST FIBERS
Get multiple OTDR fast acquisitions
@every pulses & @every wavelength
Analyze OTDR traces
Combine results
Display optical link view
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How Many DWDM Overlay Channels Can I Add?
CWDM Test Tools
Reference
ReferencePassBand
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How Many DWDM Overlay Channels Can I Add?
CWDM Test Tools
Reference
Reference6.5 nm from
CenterPassBand
Spec.
Trans.
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PM vs. CWDM analyser vs. OSA
Sensitiv
ity
Wavelength
A power meter will
mesure the
TOTAL POWER
Sensitiv
ity
Wavelength
An OSA will measure the
POWER versus wavelentgh
Including OSNR & λ
A FOT-5200 will measure
the POWER per channel
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What is OSNR (Optical Signal to Noise Ratio)?
EDFA EDFA EDFA EDFA
Mu
ltip
lexer
De
mu
ltip
lexe
r
Tx Rx
l1
l2
l3
l4
l5
l6
l7
l8
80km Section l1
l2
l3
l4
l5
l6
l7
l8
Power
Distance
OSNROSNR
Signal
Noise
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WDM Investigator
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Meet C.N. Rood and EXFO at Booth 9
Optical Test and Measurement, Monitoring
Fiber Cleaning and Inspection
Fusion Splicers
Time and Frequency Synchronization