OTDR Selection & OperationOTDR Selection & Operation

OTDR Selection & Operation ClassOTDR Selection & Operation Class

• Differences between OTDR’s and Optical Loss Test Sets – Tier 1 & Tier 2 Testing

• Review of all Noyes OTDR models (M200, M700, OFL280, and C850)

• Overview of how to set up & test with an OTDR• Selecting the right OTDR for a customer’s specific

application• Overview of OTDR operations and functions (Tier 2)• Provide the participant with real life scenarios in testing

networks• Comparison chart between models for quick reference

OTDRConnection or splice reflectivity

OTDRConnection or splice insertion loss

OTDRLink “baseline trace”

Tier 2 -- Going beyond the minimumTier 2 -- Going beyond the minimum

Tier 1 -- RequiredTier 1 -- Required

Can be verified by inspection (of cable markers) or measured using a certification test set or OTDR

Link Length

OLTS or VFL (red laser) Link Polarity

OLTS (certification test set or light source and optical power meter)

Link Insertion Loss

Tier 1 vs. Tier 2 testing…Tier 1 vs. Tier 2 testing…

• The OLTS (Optical Loss Test Set) or OLS & OPM provide the most accurate loss measurement

• Link polarity or continuity can be checked with red VFL• Length measured with certification sets use the

propagation delay method or time delay• OLTS limitations:

– Provides an overall loss value not cause of loss – If the link loss falls within specification, the result is

saved and the technician moves on to the next fiber– If the result is above the limit, the cause is unknown

Tier 1 Testing definedTier 1 Testing defined

An OLTS treats a fiber link as a “black box”It can measure only end-to-end loss or power

Power (dBm)

Distance

?

OLTS: Light Source and Power MeterOLTS: Light Source and Power Meter

IL (dB)

PIN

POUT

OTDR FeaturesOTDR Features

• The OTDR takes some of the unknown events in a network and reveals them to the technician

• Some of these events include fiber length, connector loss, splice loss and kinks or bends

• In order to measure link loss, fiber rings must be used at the beginning and at the end of the network being tested– This is because all OTDR’s can not measure the first

and last connection of the “fiber under test” (FUT)– The fiber rings provide a horizontal line before and

after the link to be tested (See example in slides to follow)…

Distance

PIN

POUT

C1

S1

C3

Fiber

TIER 2 (OTDR)

C2

RelativePower (dB)

Allows us to “see” into the link to measure the individual connections, splices, and sections of fiber

Opening the black box to see our linkOpening the black box to see our link

• Adding launch and receive cables enables the OTDR to include the loss of the near-end and far-end connection in total link loss calculations, and measure their reflectance.

1 2Single event Single event

LaunchCable Link

ReceiveCable

Fiber Rings are used as launch & receive cables

Network with fibers rings addedNetwork with fibers rings added

OTDR’s can make event and fiber measurements that an OLTS can’t:

Event Loss

Fiber Loss Slope

Event reflectance(calculated from “D”)

D

The OTDR advantageThe OTDR advantage

OTDR’s perform functions an OLTS can’tOTDR’s perform functions an OLTS can’t

Baseline Trace

Connector Checking

FaultLocation

Break

Expected traceActual trace

OTDR TraceReport

Loss

Connection

But don’t throw away your OLTS !But don’t throw away your OLTS !

• An OLTS is required by TIA/EIA-568-C for measuring link insertion loss (Tier 1)

• It measures Insertion Loss (IL) more accurately than an OTDR

• All OTDRs tend to under-estimate loss of multimode links; including fiber mis-match losses due to under filled cores

Bottom Line: It takes both an OLTS and OTDR to make all Tier 1 and Tier 2 tests

OFL 280

C-860 Test SetM700

M200

Noyes OTDR models…Noyes OTDR models…

OFL280 FlexTester - Value PropositionOFL280 FlexTester - Value Proposition

M200 features:M200 features: Transflective display for best viewing• Hand-held: < 2.0 lbs• Battery > 8-hours • Internal & USB data storage• VFL Red laser on all models• Test modes: Full-Auto, Expert & Live• Available in MM, SM & QUAD (MM & SM)• Intermediate test range up to 50 miles SM• Improved file naming and job creation • Simple menus require minimal training

OFL280 FlexTester - Value PropositionOFL280 FlexTester - Value Proposition

OFL 280 features:OFL 280 features: Transflective display for OSP applications• Hand-held: <2.0 lbs• Battery >10-hours with backlight on• Can test through splitters• Live fiber detection• OFL 280-103 model can measure downstream power levels at 1490nm & 1550nm and perform OTDR measurements at 1625nm on active networks

FRONT

OTDR(1310/1550 nm)

Optical PowerMeter (OPM) Visual Fault Locator

(650 nm)

Tool-freebattery door

Bale

PaddedCarry Handle(side-panel)

Power Input18 VDC

(side-panel)

2nd USB Drive Port(in protected slot)

USB Host &

function ports

VFL & OPM standard on all models

M700 Top/Rear Panel FeaturesM700 Top/Rear Panel Features

M700 – QUAD & SM OTDRM700 – QUAD & SM OTDR

M700 Features:• Designed for OSP & PNG applications• Available in SM, Triple & QUAD versions• 40 dB dynamic range > 160km (100mi)• Short event & attenuation dead zones• User interface is easy to use• Data storage > 1,000 traces• Live fiber protection• Battery > 8 hours• Weight 5 lbs

Introducing the C-seriesIntroducing the C-series

QUAD OLTS & QUAD OTDRQUAD OLTS & QUAD OTDR• Auto-Test (OLTS) two fibers bi-directionally• C-850 Fully integrated with OLTS, OTDR, and VFL• Can measure Loss & Length with Pass / Fail results• Complete Tier 1 & Tier 2 certification testing with reports in TRM provide concise professional reports• The “JOB” setup can be used for OLTS and OTDR• Data storage available on internal memory & USB

C-860 kit

FRONT

OTDR SM MM

Visual Fault Locator (650 nm)

Tool-freebattery door

Bale

PaddedCarry Handle(side-panel)

Power Input18 VDC

(side-panel)

2nd USB Drive Port(in protected slot)

OLSSM MM

OPM

USB Host &

function port

VFL & OPM standard on all models

C850 Top/Rear Panel FeaturesC850 Top/Rear Panel Features

Tier 1 Pass/Fail using Auto-Test from C860

Complete Network CertificationComplete Network Certification

TestModes

Utilities

M700 Main MenuM700 Main Menu

Back, Menu,and Tab touch keys

Menus and test results are

displayed hereSoft Keykey labelsand touch keys

Page nameand status

SK1 SK2 SK3 SK4 SK5

Battery status

M & C series Typical PageM & C series Typical Page

Full Auto(Automatic

OTDR)

Expert(Manual, Auto, Auto-

Once OTDR)

OPM(Optical

Power meter)

Real-Time(Real-time

OTDR)

Fiber type, launch & receive test cord lengths

Wavelength, range, pulse-width and filter

Averaging time

Event thresholds

Wavelength

Units (dB/dBm)

(Set) Reference

Automatic or default settings

Test Mode SettingsTest Mode Settings

Too short: less than link length

Link

Can’t see entire link – unpredictable results

Good: about 1.5x to 2x link length

Link

Good trace – can see end of fiber.

Too long: much larger than link length

Link

Trace is “squashed” into left side of display.

Selecting the correct test RangeSelecting the correct test Range

Too wide:

Can’t resolve events

About right:

Events can be seen and trace is smooth

Too narrow:

Trace “disappears” into noise floor

Link Link Link

Where is this event?

Selecting the correct Pulse Width (PW)Selecting the correct Pulse Width (PW)

Example of 140km fiber run with correct range & PWExample of 140km fiber run with correct range & PW

M200 with fiber rings attachedM200 with fiber rings attached

Normal C850 traceNormal C850 trace

C850 trace with bad connectorC850 trace with bad connector

Too many

Trace is smooth but waste of time

About right:

Trace is smooth

Too few:

Trace is noisy – noise floor is too high

Link Link Link

Selecting the correct Averages (Time)Selecting the correct Averages (Time)

• Full-Auto • Always tests all wavelengths applicable to the fiber type • Always creates an Event Table• Pings to determine Range – adds time to each test

• Pitfalls of Expert Auto and Auto Once • If you go from a short to a long fiber and do not change the

range the technician needs to be astute and realize that they have not seen the end of the FUT and needs to adjust the Range & PW or reshoot w Auto-Once to re-adjust for the longer FUT

• Select the correct length for Launch/Receive cables

• (PW in ns)/10 = the nominal event width of the spike in meters• Launch > (3-5 x length of pulse in meters)

How to set up & test with an OTDRHow to set up & test with an OTDR

Idealized trace of a reflective event at the

shortest pulse width, PMIN.

PMIN

Real OTDR trace.

0.5 dB

Event Dead Zone

Attenuation Dead Zone

1.5 dB

Event and Attenuation Dead ZonesEvent and Attenuation Dead Zones

Selecting the correct OTDRSelecting the correct OTDR

• What’s the fiber type?• Wavelengths required?• What’s the fiber length? This determines the range• Does the customer want: hand-held or full size?• Are they fault locating or certifying a network?• Answering these questions in this order will help to select the correct OTDR for your customer’s application• For certification be sure to combine the correct OTDR with the TRM software for concise reports

Consider the following when selecting your OTDR

OTDR selections by marketOTDR selections by market

PNG: M200 QUAD or M700-25 QUAD–The customer could add OLS 4 to the M700-25 for complete Tier 1 and Tier 2 solution

PNG Plus other: M700-24 Long Range QUADSuitable for users installing PNG, Metro, WAN & Telco/BB

FTTx: Best solution is our OFL 280 FlexTester All four SM models can test through splitters/PON Mode

Telco / Broadband: M700-20, M700-21or OFL 280 Economical hand-held solution for SM links < 80 miles

Using an OLS 2-DUAL/OLS4 with the M700 creates a complete SM/MM test solution allowing the technician to use TRM for Tier1/Tier 2 testing and reporting

Measurement Range Dynamic Range - 6 dB (always specified at PMAX)

DynamicRange

MeasurementRange

Noise floor – trace power equals average OTDR noise power or SNR = 1

Level at which OTDR can accurately measure 0.5 dB event

0.5 dB

6 dB

PMAX Backscatter level at OTDR test port

Calculating Measurement Range from Dynamic RangeCalculating Measurement Range from Dynamic Range

OTDR comparison chartOTDR comparison chart

NOYES OTDR's - ALL ModelsAll Noyes OTDR's come with a built in VFL port

  MM SM

RANGE Km / mi @1550 OPM OLS PON Mode Comments:

M200-00-0900PR YES YES 100 / 62 NO NO NOAvailable in MM, SM or QUAD versions 850/1300/1310/1550 -

22/22/26/26dB

M200-11-0900PR NO YES 100 / 62 NO NO NO 1310/1550nm - 26/26 dB

M200-12-0900PR YES NO N/A NO NO NO 850/1300nm - 22/22 dB

M700-20U-01 NO YES 160 / 99 YES NO NO 1310/1550nm - 40/38dB Long Range (LR)

M700-21U-01 NO YES 160 / 99 YES NO NO 1310/1550/1625nm - 40/38/38dB LR Triple

M700-24U-01 YES YES 155 / 96 YES NO NO 850/1300/1310/1550nm LR Quad

24/24 MM - 39/37dB SM

M700-25U-01 YES YES 100 / 62 YES NO NO Replaced M650 - QUAD

22/22 MM - 26/26dB SM

OFL 250-50U NO YES 100 / 62 YES YES NO 1550nm only - 26dB

OFL 280-100 NO YES 133 / 82 YES YES YES 1310/1550nm - 34/32dB

OFL 280-101 NO YES 133 / 82 YES YES YES 1310/1550/1625nm - 34/32/30dB

OFL 280-102 NO YES 133 / 82 YES YES YES 1310/1490/1550nm - 34/32/32dB

OFL 280-103 NO YES 133 / 82 YES YES YES Only model with Live fiber testing capability 1310/1550/1625nm - 34/32/30 dB

C850 YES YES 100 / 62 YES YES NOCertification OTDR w/ Large 6.5" Display 850/1300/1310/1550

- 22/22/26/26dB

8-17-10 Rev J

Thank you!Thank you!

For more information about the AFL -Noyes Test & Inspection products, please visit us on the web at:

www.AFLglobal.com

Or call our Sales or Technical Support group at:

1 603 528 7780

1 800 321 5298 (USA)