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© 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 HarropMike.harrop@exfo.com
© 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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TAgenda
• Encircled Flux– Purpose– Standards
• Defined templates
– Challenges
• LSPM– Configurations– 1,2,3 Cord Referencing– Challenges
• Direction of test & treatment of results.
© 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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TConnector Inspection
Before we start
© 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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ENCIRCLED FLUX
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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
© 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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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
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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?
© 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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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
© 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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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)
© 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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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
© 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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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)
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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TMM Encircled Flux
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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!
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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)
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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
© 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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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
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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LSPM
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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TReference & Test
© 2015 Fibreoptic Industry Associationwww.fia-online.co.uk
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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
HIGH BY 1 CONNECTION
CORRECT
LOW BY 1 CONNECTION
CONFIGURATION B
HIGH BY 2 CONNECTIONS
CORRECT
HIGH BY 1 CONNECTION
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
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