nt testing times–changes ahead eve g - fia...©2015 fibreoptic industry association the manor...

© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk

The Manor House, BUNTINGFORD, Hertfordshire, SG9 9AB, United Kingdom Tel: +44 (0)1763 273039 Fax: +44 (0)1763 273255

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T Testing Times– Changes Ahead

Mike [email protected]

http://www.fia-online.co.uk

mailto:[email protected]



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TAgenda

• Encircled Flux– Purpose– Standards

• Defined templates

– Challenges

• LSPM– Configurations– 1,2,3 Cord Referencing– Challenges

• Direction of test & treatment of results.




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TConnector Inspection

Before we start




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ENCIRCLED FLUX




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• MM IL measurement is highly sensitive to the source launching conditions

• Example: IL of a connector varies greatly depending on whether a VCSEL or LED is used to perform the measurement

Source Launching Conditions Measured Connector IL

Overfilled (ex: surface emitted LED)

Over evaluated (IL = 1dB to1.5dB)

Slightly under filled (targeted conditions)

On target (IL = 0.5dB)

Under filled (ex: VCSEL or

edge emitting LED)

Under evaluated (IL = 0.02dB)

The Real Problem




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TThe Real Problem

Image Source: Olivier Bouchard, AIRBUS Operations

There is a risk fiber defects such as connector misalignment and dirt may not be detected, if the MM light source used to perform the dB loss has “under filled” launching conditions




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• Before

– Previous launching conditions (requirements or definitions) didn’t provide repeatable launching conditions

– Variations of IL measurements were common and tolerated

• Tolerated because:

– Multimode networks were transmitting at relatively slow speeds and optical loss budgets were large (ex: Fast Ethernet had > 12dB for loss budget )

Why should anyone care?




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TNetwork Standards

The deployment of 40/100 Gig E is a major driver for EF compliance testing, where the link total link loss budget is only 1.5 dB at 850 nm on OM4 (50 µm) MM fiber




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TWhy should anyone change?

• Today

– Channel insertion loss requirements for modern high speed systems are much tighter.

• 1.9 dB for 40/100 Gig E (OM3 fibre - 100m)

• 1.5 dB for 40/100 Gig E (OM4 fibre – 150m)

• Therefore

– IL must now be measured precisely to ensure system performance

– The industry now needs repeatable and consistent IL measurements

– The response to this new need is the Encircled Flux Encircled Flux template for attenuation and loss measurements (IEC-61280-4-1/TIA-526-14B)




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TWhat is EF?

• It is a new method to define the launch conditions of a light source

• EF measurement is based on the power distribution measurement on the connector end face of the light source, reference jumper or conditioner




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TMModal Power Distribution

0 0.2 0.4 0.6 0.8 1

0 0.2 0.4 0.6 0.8 1

0 0.2 0.4 0.6 0.8 1

OVERFILLEDLAUNCH

“EQUILIBRIUM”STYLE LAUNCH

VCSELLAUNCH

X-axis = Mode Group (normalised)

Cumulative Power

Distribution(normalised)




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TMM Encircled Flux




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TChallenges

• 1 for 50 µm at 850 nm• 1 for 50 µm at 1300 nm

• 1 for 62.5 µm at 850 nm• 1 for 62.5 µm at 1300 nm

There are 4 different EF Templates!




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TChallenges

4 different EF templates are defined in the testing standards

Difficult and/or expensive to get a single test source to meet all requirements

50/125 62,5/1258501300

••

••

“EF accessories” developed

Installers are unlikely to remember to use correct configurations

SIMPLIFICATION IS DESIRABLE




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TMM Applications

10 IEEE 802-3: FOIRL X X10 IEEE 802-3: 10BASE-FL, FP & FB X X16 ISO/IEC TR 11802-4: Token Ring X X52 ATM at 51,84 Mbit/s X X

850 1300

XX

X100 IEEE 802-3: 100BASE-FX X XX

133 DIS 14165-111: Fibre Channel (FC-PH) X XX

266 DIS 14165-111: Fibre Channel (FC-PH) X XXX531 DIS 14165-111: Fibre Channel (FC-PH) X XX

1000 DIS 14165-111: Fibre Channel (FC-PH) X XX

1000 1 Gbps Fibre Channel X XX

2000 2 Gbps Fibre Channel XX4000 4 Gbps Fibre Channel XX8000 4 Gbps Fibre Channel XX

1000 IEEE 802-3: 1000BASE-SX XX X1000 IEEE 802-3: 1000BASE-LX XX X

100 EN ISO/IEC 9314-3: FDDI PMD X XX

10000 10GBASE-SR/SW XX10000 10GBASE-LX4 XX

4 ISO/IEC TR 11802-4: Token Ring X XXX

156 ATM at 155,52 Mbit/s X XXX

622 ATM at 622,08 Mbit/s X XXX

16000 16 Gbps Fibre Channel XX40000 IEEE 802.3: 40GBASE-SR4 XX100000 IEEE 802.3: 100GBASE-SR10 XX

50/125 62,5/125

XXXXX

X

XX

X

XX

X

X

X

X

LED VCSEL

X

X

FP LASER

XX

XX

X

XX

Mb/s

Trend is for 50/125, VCSEL-based applications at 850 nm1300 nm applications are either LED-based or FP-LASER based

62.5/125 will have reduced impact (see plans for generic cabling standards)




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TMM Wavelength Proposals

VCSEL-based EF is really useful for 50/125 at 850 nm

EF is not particularly useful 1300 nm

Small market for 62,5/125 at 850 nm

Conformance tests restricted to 850 nm

Use EF products

Test at 1300 nm only where required, EF irrelevant

FIA guidance




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TTesting Standards

FIA ENDORSED STANDARDS

OTHER STANDARDS (NON-ENDORSED)

FIA TECHNICAL SUPPORT DOCUMENTS

BS EN 61280-4-1:2009

BS EN 61280-4-2:2014

ISO/IEC 14763-3

2000-4-2-1

2000-4-2-2

2000-4-2-3

Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant - Single-mode attenuation and optical return loss measurement

Fibre optic communication subsystem test procedures - Part 4-1: Installed cable plant - Multimode attenuation measurement

Information technology - Implementation and operation of customer premises cabling Part 3: Testing of optical fibre cabling

Optical Fibre Cabling: Testing of installed cabling: LSPM

Optical Fibre Cabling:Testing of installed cabling: OTDR

Optical Fibre Cabling: Testing of installed cabling: Specification, procurement and use of test cords

ALL MANDATE ENCIRCLED FLUX FOR MM TESTING




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LSPM




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TLSPM Cabling Configurations

A B

A B

A B

containing cable(s), splices and connections

Configuration APanel-to-panel

Configuration BPlug-to-plug

Configuration CPanel-to-plug

Channel

Link

Equip Equip




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TReference & Test




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TLSPM Reference Conditions

INSTALLED LINK RESULTREFERENCING METHOD APPLIED

1 cord

3 cords

CONFIGURATION A 2 cords LOW BY 1 CONNECTION

LOW BY 2 CONNECTIONS

CORRECT

CONFIGURATION B

HIGH BY 2 CONNECTIONS

CORRECT

HIGH BY 1 CONNECTION

CONFIGURATION C


CORRECT

LOW BY 1 CONNECTION

CONFIGURATION B

HIGH BY 2 CONNECTIONS

CORRECT


All measurements are subject to the fundamental accuracy of the technique

1 cord

3 cords

2 cords

1 cord

3 cords

2 cords

1 cord

3 cords

2 cords

INSTALLED CHANNEL REFERENCING METHOD APPLIED

allowed with amended limits

RESULT

NOT SUPPORTED

NOT SUPPORTED

NOT SUPPORTED

NOT SUPPORTED

NOT SUPPORTED




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TTest. What next?

LSPM TESTING

STAGE 1 Make a reference measurement (1 cord, 2 cord or 3 cord)

STAGE 2 Make the measurement

LS PM

LS PMA B

Do we test in one direction or should we test in both?Which result do I give?




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TDirections of Test

A EQPEQP

Simple link - no fundamental difference in result (statistical variation only)

A EQPEQP

Embedded connecting hardware

Complex link - results may differ in each direction

Assuming test cords are “the same”as each other and the cabling under test

Assuming test cords or “the same” as each other

Bi-directional test unnecessary

Bi-directional recommended




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OTDR

Treatment of Results

LSPM

L AT PMLS

L TOTDR

Result = highest loss

Result = {→ + ←}/2

T AL LSPM

L T




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TLSPM - Summary

BS EN 61280-4-1, 4-2 and ISO/IEC 14763-3

Use correct reference

Uni-direction or Bi-directional test

Treatment of results (highest or average)




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TConclusion

• Multimode Testing– Most work likely to be on 50um fibre– Test at 850nm – use EF products– Only test at 1300nm when required (EF not critical)

• LSPM– Use the correct reference– Uni or bidirectional test– Treatment of results.

FIA @ 25(1990-2015)




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Questions


nt testing times–changes ahead eve g - fia...©2015 fibreoptic industry association the manor...

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