ftth testing

7/30/2019 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


Laser Source

Power Meter

Note: To measure Insertion Loss, use laser source and

power meter.


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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


7/16 2011 JDS Uniphase Corporat ion | JDSU CONFIDENTIAL AND PROPRIETARY INFORMATION 7

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



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.



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



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.



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



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.



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.



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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