yokogawa’s experience with ftth testing - bicsi testing... · yokogawa’s experience with ftth...
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Yokogawa’s experience with FTTH Testing
Optical CommunicationT&M Business Group
Yokogawa Corporation of America
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Abbreviated Corporate Background Yokogawa was founded in 1915 First products were Electric Meters Expanded ever since with Test & Measurement as core
competency ~18,000 employees worldwide ~$4 Billion USD revenue
Yokogawa Corporation of America founded in 1957 Operated continuously in US ever since North American HQ in Newnan, GA Manufacturing in Newnan & Houston, TX
Additional facilities in Canada & Mexico
Bought out existing partners in Ando Electric in 2004 Leader in OTDR development & innovation Leader in OSA development & innovation
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Yokogawa OTDR History
AQ1720
AQ7110
AQ7140AQ7210
AQ7260
AQ7250
AQ7220AQ7155
2007
AQ7270/ 7275
1985ANDO→
Yokogawa
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Basic OTDR Principle of Operation
LD
directional coupler / mirror
LD
Pulse-generator Photodiode
Amplifier
averaging
Optical fiber
Pulse-light
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Standard OTDR Measurement Trace
dB
OTDRPulse
ConnectorConnection
Fusion Splice
Bending Break point
Distance→
← Relative level (dB)
▼
▼
▼
▼:Events
③Reflection
②Loss
①Distance
▼
E
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Measurement of FTTx applications
Application: OTDR measurement and FTTH
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OTDR Test PointsThis figure shows ODF( Optical Distribution Frames) unit interface between outside plant and active transmission equipment. This ODF size varies from a few hundred up into thousands of optical fibers.
Transmitter
An installer’s daily workload can include checking more than a thousand fibers.
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OTDR trace indication of cleanliness
Clad
Core
This is the measurement figure with a dirty connection and a clean connection.
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Active fiber check method
Live Fiber Indication and alarm(Fail-safe function)
- avoids on-channel measurement of fibers with in-service wavelengths
Optical power monitor function
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Measuring the first connection
Put the dummy fiber before
Dummy fiber area
Fault point
Fault point loss is unclear
Use dummy fiber
The dummy fiber is very useful to find out fault that if the fault point is near end points
Source : NTT
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Built-in Dummy Fiber (Option)- For accurate fiber loss measurement close in.
2
12
1
1
Built-in Dummy fiber
Fiber loss measurement is inaccurate. Because the Marker 1 cannot be placed correctly.The loss data varies by operators.
Fiber loss measurement is accurate. Because the operator error in placing marker 1 can be prevented, fiber loss and the connection loss can be calculated accurately and easily. Auto-search function can detect this event.
Fiber Loss
Fiber Loss
1
OTDR with Dummy fiber
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OTDR Required Performance
The World’s Shortest Dead Zone < 80cm - Absolutely a killer specification for FTTH testing
Event Dead Zone: < 80cm
1.5dB
Event dead zone
@ 45dB ORL
0.8m
1dB/div
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Pulse width=100ns
・・
・・ONU
OLT
2nd Splitter1st Splitter
OTDR measurement over the splitter (PON)
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High Dynamic Range: OTDR & splitters (PON)
OTDR trace shows port1 and port2 as same trace. The location should be distinguished but loss measurements are still complicated.As shown here, splices on two different fibers show on the same trace, as do the end events.
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This is an example of bending loss when they close the cover and clipped optical fiber cable
Sometimes the customer moved this ONU and the optical cable has been bent
During installation some of the points can have excessive bending loss
Macro-bending loss measurement at 1625nm/1650nm
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Bending loss measurement with 1625nm
1625nm wavelength is more sensitive than 1310/1550nm wavelength
1310/1550nm
1625nm
If there is excessive bending on the fiber the 1.31um/1.55um are not sensitive enough to find out it. However it can be measured by 1.625um wavelength the loss obtained easily.
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Testing Requirements so far
Cleanliness of the fibers Live Fiber alarm
Not mentioned, but a plug check for good OTDR connection should also be considered
Use a Dummy Fiber (launch fiber) or not Can impact total loss and use dynamic range up.
High Quality Dead Zone (shorter is better) High Dynamic Range to measure through splitters Ability to find macro bends with longer wavelengths
But what about live networks? What happens when a single location fails or deteriorates?
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Complex OTDR measurements & splitters (PON)
AQ7250mini-OTDRAQ7250mini-OTDRAQ7250mini-OTDRAQ7250mini-OTDRAQ7250mini-OTDRAQ7250mini-OTDRAQ7250mini-OTDR
1 0 0 m
4 0m
2 0 0 m
5 50 m
8 5 0 m
1 km
2 km
終端
終端8分岐スプリッタ
40m2Km
1Km850m
550m200m
100m
TerminateTerminate
1 x 8 Splitter
Home
PW:100ns
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Macro Bends in a live networkActive line measurement without filter and filter
Fault
Clear indication of fault point
Using filter
Unclear indication of fault point OTDR result will be influenced by active line
Source:NTT
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1.625um,Pw:1us,In-service light:-19dBm
Can not measure
AQ7275 without Filter type
Influence of live signals
1.625um,Pw:1us,In-service light:-19dBm
Can measure
AQ7275 Built-in Filter type
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Easy to manage Multi-Core Fiber Measurement
Multi-Core Fiber Measurement Function
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Smart File Name Structure - For easy file management
Comment (e.g. Cable name)
Cable (Tube) ID
fiber no.
Example of file name:[1310nmYOKOGAWA22a.sor]• NAME TYPE :WL + Comment + No. • COMMENT : YOKOGAWA• ID: 22• Tape no: a-b
Auto-increment function: 1. 1310nmYOKOGAWA22a.sor2. 1550nmYOKOGAWA22a.sor3. 1310nmYOKOGAWA22b.sor4. 1550nmYOKOGAWA22b.sorUnderlined items increment for each file saving.
Tube fiber
Setup window for file name format
Smart File Name Function
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OTDR Emulation Software
OTDR Trace Analysis Generate Test Reports
Emulation software
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Emulation software and OTDR
USB memory
Directly connect by the USB cable
OTDR Measurement data Transfer to PC
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Yokogawa OTDR AQ7275 Series
High Dynamic735033
Standard735032
MM/SM 4λ735041
Higher dynamic735034
1650nm 1λ735031
1490nmPON735035
1625nm 3λHDR735038
1650nm 3λ735037
1625nm 3λHDR735036
New AQ7275 series 9 modelsIn-service trouble shooting
(built-in filter)
FTTH I&M
Metro/access I&M
Core/Metro I&M
FTTH PON system
In-service trouble shooting(built-in filter)
In-service trouble shooting(built-in filter)
Metro/Core I&M
High-speed LAN/FTTH I&M
Consolidated AQ7270 into AQ7275 series