FTTH Testing
Transcript of FTTH Testing
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FTTH Testing
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2011 JDS Uniphase Corporat ion | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 2
Qualifying FTTH networks
Method #1: Use of Optical Loss Test Sets
This method involves using an optical loss test set (OLTS), comprising
two test sets (power meter and laser source) that share data to measure
insertion loss (IL).
Method #2: Use of an OTDRThis method uses an optical time-domain reflectomer (OTDR). The
OTDR will reveal splices loss, connector loss and reflectance, and the total end-
to-end loss, ORL and distance.
Method #3: ORL
Optical return loss is the loss of signal power resulting from thereflection caused at a discontinuity in a optical fiber link. This discontinuity can be
a mismatch with the terminating load or with a device inserted in the line.
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Method #1: Optical Loss Test Method
Typical Insertion Loss Values of a Splitter:
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WDM
Passive SplitterPON OLT
Video AMP
RP Video
Central Office Drop
Terminal
DropTermin
al
Distribution fibers
Feeder fiber
1490/1550nm
1310nmONT
ONT
ONT
ONU
Method #1: Optical Loss Test Method
Laser Source
Power Meter
Note: To measure Insertion Loss, use laser source and
power meter.
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Method #1: Optical Loss Test Method
Performing a reference measurement
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Method #1: Splitter Test Setup
Splitter Power Meter
Laser Source
1. Connect the Laser Source to the Input
2. Connect the power meter to the first split.
3. Check and record the power meter reading.
4. Check all the succeeding splits.
Note: The difference between the Laser
source and power meter reading is the
Insertion Loss (dB).
For example: Laser source = -7 dBm
Power Meter = -17 dBm
Insertion Loss = 10 dB
-7 dBm
-17 dBm
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Method #2: OTDR Method
WDMPassive SplitterPON OLT
Video AMP
RP Video
Central Office
DropTerminal
Drop
Terminal
Distribution fibers
Feeder fiber
1490/1550nm
1310nmONT
ONT
ONT
ONU
CO to splitter
CPE to CO
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Typical Loss Measurement of a Splitter:
What the OTDR sees
Method #2: OTDR Testing through splitters
Note: OTDRs have certain distance limitations when testing over a
splitter. It can only see a split with distances beyond 150 meters.
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OTDR Method: 1st Scenario (CO to splitter)
1. Connect the OTDR to the Input of the Splitter.2. Configure the OTDR settings. (Set the pulsewidth to 100ns or 300ns)
3. Start test.
4. The OTDR should see the correct number of splits in its result and the correct
distance.
Fig. 1: Actual testing
Fig.2:Lab testing
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OTDR Method: 2nd Scenario (CPE to CO)
1. Connect the OTDR to the CPE.
2. Configure the OTDR settings. (Set the pulsewidth to 100ns or 300ns)
3. Start test.
4. The OTDR should see the correct distance.
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FiberComplete, the new partner in fiber testing optimization
JDSU introduces FiberCompleteTM for fully automated & easy fiber network
deployment FiberComplete is the first solution of its kind to allow performing all the fundamental fiber
qualification testsbi-directional Insertion Loss (IL) and Optical Return Loss (ORL)
combined with OTDR from one module and from ONE optical port
T-BERD-4000 FiberComplete
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T-BERD-4000: Multiple Fiber Testers in ONE
First slot: Fiber Complete- Continuity check- Loss meter
- Power meter- Light source- ORL meter- Length meter- OTDR/Fault Finder
VFL Talkset HighPower orBroadband Power meter
Digital probe withpass/fail analysis(FiberCheck 2)
Second slot:- Multimode OTDR- PON Powermeter- CWDM Analyzer
T-BERD-4000 platform with FiberComplete: the most complete fiber solution that
covers all the network lifecycle testing requirements, for the installation, turn-up and
maintenance/ troubleshooting of fiber links.
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FiberComplete, a New Test Principle
Continuity Check
Insertion Loss (IL)
Optical Return Loss(ORL)
Distance
OTDR &/or FaultFinder
Perform all fundamental fiber qualification tests required tests
Automatic continuity check and product pairing usingthe fiber under test
IL/ORL Pass/fail indicator based on user-definedthresholds
Intelligent Fault Finder or OTDR
Automatic results storage
in one fiber connection, with one key press.
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Loss, ORL, distance and OTDR
1. Real time automatic continuity check with detection of the distant unit in few seconds
Both units are connected to the fiber A unit is disconnected from the fiber
3.1 Full OTDR trace documentation, with
table of results: splices & connector losses,
macro-bends, and reflectance
2. Bi-directional Insertion loss (IL), OpticalReturn Loss (ORL) and distance
measurements.
Fiber View
Cable View
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Loss, ORL, distance and fault finder
1. Real time automatic continuity check with detection of the distant unit in few seconds
Both units are connected to the fiber A unit is disconnected from the fiber
2. Bi-directional Insertion loss (IL) andOptical Return Loss (ORL) and
distance measurements
3. FaultFinder to identify the position of apoint fault for either loss or ORL failures, or
both.
Fault Analysis
WorstReflectance -20.5 dB @ 1024 m for 1550 nm
Fiber View
Cable View
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