pon fttx advanced testing procedures and equipment - · pdf file sales@rertech.it 1 pon_fttx...

1www.rertech.it sales@rertech.it

PON_FTTx ADVANCED TESTING

PROCEDURES AND EQUIPMENT

Typical FTTx Infrastructure

Commercial NetworkOptical Access NetworkBackbone & Bearer Network

1xN SplitterONU

ONU

ONU

ONU

OpticalVideoTransmitter

EDFA

WDMCoupler

OLT

COCATV

2www.rertech.it

sales@rertech.it

Downstream1490 nm

Upstream1310 nm

1490nm/1310nm/1550nm

Voice & Data Voice/Data/Video

Splitter(1x32)

WDMCoupler

Video1550 nm

OLT

EDFA

ONU

FTTx Services

1310 nm 1490 nmDownstreamUpstream

1550 nm

Analog TV & Digital TVHD/VOD

110 MHz 860 MHz5-65 MHz

Bandwidth & Service

VideoVoice & Data@ 622 Mbps

Voice & Data@ 155 to 622 Mbps

3www.rertech.it

sales@rertech.it

Imperative FTTx

Replacement ofcopper cableswith optical cables

Full-servicebroadbandrequirement

SupportFull-serviceAccess

IndustryRestructuring

FTTxPON

Customer RequirementCompetitionTechnical TrendNetwork and Service TransitionEnterprise Cost

VoiceDataVideo

High band-width consumptionservices emerges: P2P, on-line video,IPTV

More high band-width requirementfrom customer

Telecom resource allocation isoptimized. Aggravated Competition.

Single service competition extends tofull-service competition

4www.rertech.it

sales@rertech.it

FTTx Trend

Integrated Home &Commercial NetworkHigh-speed Optical Access Network

5www.rertech.it

sales@rertech.it

FTTxNetwork Testing

Installation Service DeploymentMaintenance &Troubleshooting

The Challenge for FTTx Testing

New wavelength: 1490nm

Water peak cause additional loss

Short-distance fiber connection

application

Require high-accuracy OTDR

Vast connector application in the

network

The cleanness and reliability of optical

connectors

Bi-directional loss test

Ensure bi-directional transmission

quality

Macro bend inspection

Vast connector application in networkThe cleanness and reliability of optical

connectorsWavelength multiplexing/Bi-direction/High

power/Burst modeFilter/Burst mode detecting/Dual port Power

MeterSplitters used in the networkHigh accuracy and high dynamic OTDRBroadcastingOTDR: In-service test/pass thru splitter

Vast connector application in networkThe cleanness and reliability of optical

connectorsWavelength multiplexing/Bi-direction/High

power/Burst modeFilter/Burst mode detecting/Dual port

Power MeterSplitters used in the networkHigh accuracy and high dynamic OTDRBroadcasting TypeOTDR: In-service test/pass thru splitterVisible fault locator

6www.rertech.it

sales@rertech.it

FTTx Installation Stage

New wavelength: 1490nm

Water peak cause additional loss

Short-distance fiber connection application

Require high-accuracy OTDR

Vast connector application in network

The cleanliness and reliability of optical connectors

Bi-directional loss test

Ensure bi-directional signal transmission quality

Macro bend inspection

7www.rertech.it

sales@rertech.it

Segment Test on Entire Fiber Linkwith OTDR

OLT Splitter

ONU

ONU

New wavelength: 1490nm

Potential problem: Water peak causes

additional lossWater peak fiber All wave fiber

8www.rertech.it

sales@rertech.it

Triple-wavelength test:

1310/1490/1550nm in PON

Verify if network quality meets the requirement of FTTx servicesignal transmission at installation stage

Short distance fiber application (small dead zone):

High accuracy for testing events in short distance

Additional function: SLS+OPM+VFL

Optional built-in functions make the verification work duringnetwork construction easier

Solution:PON OTDR for Installation Stage

1310nm

1490nm1550nmPALM-OTDR-S20C/P

9www.rertech.it

sales@rertech.it

Triple-wavelength on PON / Bi-directional Transmission

Need for Bi-directional Optical loss test

Segment Fiber(Cable) / Test of Splitter Loss

Need for testing each fiber(cable) segment and splitter loss fromboth directions

Bi-directional Optical Loss Test

OLT Splitter

ONU

ONU

Transmission Fiber

1490nm Downstream Voice/Data

1550nm Downstream Video

1310nm Upstream Voice/Data

10www.rertech.it

sales@rertech.it

Solutions:Three available

OLT Splitter

ONU

ONU

1. Test entire fiber link loss and ORL using OLT-50P on both directions2. Or test fiber link loss with HH-OTDR-S20C/P-PS (OTDR+SLS+OPM)3. Or test fiber link loss with PPM-30-PS (PPM+SLS+OPM)

OLT-50PPPM-30-PSPPM-30-PSPALM-OTDR-

S20C/P-PSOLT-50P PALM-OTDR-

S20C/P-PS

11www.rertech.it

sales@rertech.it

FTTx Deployment Stage

Vast connector application in networkThe cleanliness and reliability of optical connectorsWavelength multiplexing/Bi-direction/High power/Burst

modeBuilt-in filter/Burst mode detecting/Dual port Power MeterSplitters used in the networkHigh accuracy and high dynamic OTDRBroadcasting signals from OLTOTDR: In-service test/pass through splitter

12www.rertech.it

sales@rertech.it

Wavelength multiplexing

Bi-directional

PON Power TestUsing a PON Power Meter

High power

Burst mode

1490nm Downstream voice/data

1550nm Downstream video

1310nm Upstream voice/data

WDM

1550nm Downstream video EDFA Up to +17dBm

ONU1#

ONU2#

ONU3#

13www.rertech.it

sales@rertech.it

Test 1: Downstream signals at two wavelengths

2 signals of different wavelengths and power1550nm CATV signal of 17dBm

1490nm data signal of 4dBm

Value displayed on normal OPM: about 17.1dBm

Separate power of 1490nm & 1550nm signals ?

Optical Power Test-1

Solution:

Power meter with built-in wave filter

Good channel isolation

Coupler

WDM

1550nm

1490nm 1310nm

1310nm

1490nm 1550nm

1490nmDetector

1550nmDetector

1310nmDetector

1490/1550nm

14www.rertech.it

sales@rertech.it

Solution:Power Meter has dual optical ports (Pass through)

Test 2: How to measure upstream signal at 1310nm on the same fiber ?

- ONU transmits 1310nm upstream signal only when OLTactivation signal received (G.983)

- ONU stops transmitting when fiber is disconnected

- Ordinary power meter won't work

PPM-30PON Power Meter

Optical Power Test-2

15www.rertech.it

sales@rertech.it

Test 3: Test upstream sparse signalONU transmits 1310nm upstream signal only in certain timeslot

OLT controls time slotONU communicates with OLT periodically (100ms, due tosystem difference; Order of magnitude on EPON: ns

Solution:Power Meter supports burst modePower Meter complies with EPON\GPON testing requirementAutomatically identify PON standard and switch to corresponding test

mode

OLT Splitter

ONU1

ONUn

ONU21 2 n

1310nm 12

n

Optical Power Test-3

16www.rertech.it

sales@rertech.it

Test Point 1: At Splitter

Power of downstream 1550nm video signal

Power of downstream 1490nm data signal

Separate test at each port

Service Activation Test-Test Point 1

ONUOLT DTSP

17www.rertech.it

sales@rertech.it

Test Point 2: At Drop Terminal

Power of downstream 1550nm video signal

Power of downstream 1490nm data signal

Signal from CO through splitter

Separate test at each port

ONUOLT DTSP

Service Activation Test-Test Point 2

18www.rertech.it

sales@rertech.it

Test Point 3: At ONU (Pass-through Test)

Power of downstream data & video signals

Power of upstream data signal

Signal power after all kinds of PON components

PPM-30 features pass-through function, ideal for serivce

activation test

OLT DT ONUSP

Service Activation Test-Test Point 3

19www.rertech.it

sales@rertech.it

PPM-30 has 60 definable threshold sets

Each set consists of 3 wavelengths with their own pass, warning

and fail thresholds:

1310, 1490, 1550nm

Threshold sets for different test points:

Drop Terminal, ONU, FDH etc.

At ONU for example:

Fail

Pass

Warning

Fail

6 dBm(pass)2 dBm(warning)1 dBm(fail)

1310 nm

Fail

Pass

Warning

Fail

-4 dBm(pass)-22 dBm(warning)-25 dBm(fail)

1490 nm

Fail

Pass

Warning

Fail

6.9 dBm(pass)-10.6 dBm(warning)-13.6 dBm(fail)

1550 nm

Service Activation Test-Pass/Fail Assessment

20www.rertech.it

sales@rertech.it

OTDR issues in PONs

High insertion loss may cause test error using traditional

OTDR

Broadcasting

Splitter type Theoretical loss

1:2 3dB1:8 9dB1:16 12dB1:32 15dB1:64 18dB

SplitterOLT

Splitter is the main power consumptionin PON

Broadcasting from OLT though splitter

21www.rertech.it

sales@rertech.it

Solution: OTDR Application at PONDeployment StageDynamic Range:

- To test fiber from end to end, the dynamic range of OTDR should be high

- For Class B equipment, the minimum dynamic range should be above 33

dB.

Short dead zone:

High accuracy for testing events in short distance

Triple-wavelength test:To test triple-wavelengths in PON:1310/1550/1625nm

Wave filter / Test trhough splitter:1625nm wavelength with filter /Test through splitter

Splitter and fiber-end identifiable

Additional function: SLS+OPM+VFL

Optional built-in functions make the verification work during network

construction easier

PALM-OTDR-S20C/X

22www.rertech.it

sales@rertech.it

Trace of palmOTDR testing through splitter (Splitter introduces high insertion loss,

12dB typically for 1*16 splitter): splitter, events after splitter including fiber-end are

identifiable

The Challenge to OTDR Testing -Testing Through Splitter

23www.rertech.it

sales@rertech.it

FTTx Maintenance Stage

Vast connector application in networkThe cleanliness and reliability of optical connectorsWavelength multiplexing/Bi-direction/High power/Burst

modeWith Filter/Burst mode detecting/Dual port Power MeterSplitters applicationHigh accuracy and high dynamic OTDRBroadcastingOTDR: In-service test / Test through splitter

24www.rertech.it

sales@rertech.it

First inspect the whole situation, then go for partial inspectionFirst diagnose and determine fault type: overall or partial/individual faultFor large scale breakdown, inspect CO (central office) firstFor partial/individual fault, troubleshoot at fault point

First outdoors, then indoor inspection (on end user site)To inspect outdoors e.g, splitter or other equipment on the end user site first.Troubleshoot fault at end-user site after outdoor check points inspected

Progressive inspectionProgressive inspection, Fault locating, Troubleshooting

Maintenance Suggestion

25www.rertech.it

sales@rertech.it

Fault Case 1:ONU LOS Warning

Use PPM-30 to measure at different test points from ONU to OLT

PPM-30 can measure triple-wavelength signals simultaneously

OLT SP DT ONU

26www.rertech.it

sales@rertech.it

Fault Case 1- Fault Analysis

Reason: The loss on splitter port is too high,which cause significant signal loss on the link

Solution:

Suggestion: Keep spare ports as backup in construction design.2. To inspect the cleanliness of fiber/connector end-face with OCI-20 opticalconnector inspector.

Clean the connector first and re-measure optical powerReplace the connector if it is damaged or cleaning fails

ONUOLT SP DT

Port with potential fault

27www.rertech.it

sales@rertech.it

To locate fault at different points from ONU to OLT using PPM-30 PON powermeter

To use OTDR for fault locating if the fault is on the fiber link

ONUOLT SP DT

To test in segment from ONU or Splitter by OTDR to locate faultaccurately.With filter at 1625nm wavelengthIn-service testing

Fault Case 2:Low or lost ONU signal

28www.rertech.it

sales@rertech.it

Fault Case 2- Fault Analysis

Reason: Connector or fiber is damaged

Solutions:1.To test from ONU, then locate and fix fault.

ONUOLT SP DT

Potential fault

2.To detect fault on connector with visible fault locator. To reconnect orreplace the connector if the red light glows obviously on connector end-face.

29www.rertech.it

sales@rertech.it

PON Maintenance OTDR

Working wavelength: 1625nm (Single wavelength is enough for in-

service troubleshooting, cost-effective)

Built-in filter, in-service test

Test through ×64 splitter

Splitter and fiber-end identifiable

Dynamic range 35dB

Short dead zone 1.6m

Macrobend detection with visible laser source

Additional function: SLS+OPM Optional built-in functions make the

verification work during network construction easier PALM-OTDR-S16C/N

OTDR VFL

30www.rertech.it

sales@rertech.it

FFTx-PON TESTINGEQUIPMENT

31www.rertech.it

sales@rertech.it

OTDR Solution

PALM-OTDR-S16C/NSpecial for testing at PON

maintenance stage1625nm with filterDynamic range: 37dBIn-service test

×64 splitterSplitter & fiber identifiable650nm Visible Fault LocatorOptional SLS/OPM

PALM-OTDR-S20C/XSpecial for testing at PON

service deployment stage1310/1550/1625nm

(1625nm with filter)Dynamic range: 38/37/37dBIn-service test

×64 splitterSplitter & fiber identifiableOptional SLS/OPM/VFL

PALM-OTDR-S20C/PSpecial for testing at PON

installation stage1310/1490/1550nmDynamic range: 38/37/37dBVerify if network quality meets the

requirement of FTTx service signaltransmission

Optional SLS/OPM/VFL

32www.rertech.it

sales@rertech.it

Loss Testers and Power Meters

OLT-50P Optical Loss TesterSLS working wavelength:

1310/1490/1550nmOPM calibrated wavelength:

850/1300/1310/1490/1550/1625nmAuto bi-directional loss testAuto wavelength

identification/SwitchORL test

33www.rertech.it

sales@rertech.it

PPM-30 PON Power Meter1310/1490/1550nmsimultaneous measurementPass-through testBurst modeBuilt-in filterOptional SLS/OPM/VFL

Model Wavelength(±20nm)

DynamicRange(dB) Event DeadZone(m) Attenuation

DeadZone(m)

palmOTDR-S16C/N 1625 37 1.5 10

palmOTDR-S20C/P 1310/1490/1550 38/37/37 2.5 14

palmOTDR-S20C/X 1310/1550/1625 38/37/37 1.5 10

Connector FC/PC (Interchangeable SC, ST)

Averaging Time 15s,30s,1min,2min,3min

Distance MeasureAccuracy ±(1m + 5×10-5×distance + sampling space)

Attenuation DetectAccuracy ±0.05 dB/ dB

Data Storage 1000 records

Connectivity RS-232/USB

Power Supply NiMH Battery / AC Adapter

Battery Life 8 hours continuous operation; 20 hours standby (on one charge)

PALM-OTDR Handheld OTDR

34www.rertech.it

sales@rertech.it

PPM-30 PON Power MeterModel PPM-30

Calibrated Wavelength 1310nm 1490nm 1550nmMeasurement Range (dBm) -40 ~ +10 (1) -40 ~ +12 -40 ~ +20Spectral Passband (nm) 1310±50 1490±15 1550±10Power Uncertainty (dB)Accuracy (dB) 0.01Insertion Loss (dB)Visible Fault Locator (Optional)Output Power (dBm) -3Max Measurement Range 5 KmOptical Power Meter (Optional)Calibrated Wavelength (nm) 850,1300,1310,1490,1550,1625Power Range (dBm) (2) -70 ~ +10Detector Type InGaAsAccuracy ± 5%± 0.01nW(±0.5dB@850nm)MOD Identification 270, 1K, 2K HzStabilized Laser Source (Optional)Wavelength (±20nm) 1310, 1490, 1550nmOutput Mode CW, 270Hz, 1KHz, 2KHzSpectrum Width (nm)Output Power (dBm) -7Stability ±0.05dB/15min,±0.10dB/8hr@ 1310/1550Output Power Display YesConnector FC/PC (Interchangeable SC, ST)General SpecificationsData Storage >2000 recordsData Interface USBPower Supply NiMH Battery (1600mAh, 9.6V) / AC AdapterBattery Life

35www.rertech.it

sales@rertech.it

Model OLT-50PStabilized Laser SourceWavelength (±20nm) 1310/1490/1550Spectrum (nm)Emitter Type FP-LDOutput Power (dBm) >-4Stability ±0.05dB/15min;±0.10 dB/8 hours@1310/1490/1550nmOutput Mode CW, 270Hz, 1kHz, 2kHz

Optical Power MeterCalibrated Wavelength (nm) 850, 1300, 1310, 1490, 1550, 1625Power Range (dBm) -70~+10 -50~ +27UnitDetector Type InGaAsAccuracy ±5%±0.01nW (±0.5 dB@850nm) ±5%±1nW(±0.5 dB@850nm)Resolution 0.01dBAuto Wavelength Identification Yes (With ShinewayTech specified Stabilized Laser Source)MOD Tones (Hz) 270, 1K, 2K

Optical Loss TestLink Loss Range 50dB (1550nm, 200km)Link Loss Accuracy ±0.25dBLink Loss Test Time < 2second / wavelengthORL (Optional)ORL Range 0 ~ 60dBORL Accuracy ±0.75dB@(0 ~ 50dB),±1.5dB@(50 ~ 60dB)ORL Uncertainty ±0.5dB@20dB

OLT-50 Optical Loss Tester

36www.rertech.it

sales@rertech.it