Testing Installed Cabling - we know not what we do! Mike Gilmore FIA Technical Director

Transcription

1 Testing Installed Cabling - we know not what we do! Mike Gilmore FIA Technical irector

2 Mike Gilmore tandards Activities Member: IO/IEC JTC1 C25 WG3: Generic Cabling IO/IEC JTC1 C25 Project Team: OHO Convenor: IO/IEC JTC1 C25 WG3 IPTG: Industrial Premises Cabling Convenor: CENELEC TC215 WG1: IT Cabling CENELEC TC215 WG1 PT Industrial Premises Cabling ecretary: CENELEC TC215 WG1 PT ata Centre Cabling Mike Gilmore enior Partner, The Cabling Partnership Managing irector e-ready Building Chairman: BI TCT7/-/1: IT Cabling BI TCT7/-/3: IT Cabling upport Group Technical and tandards irector: Fibreoptic Industry Association Mobile: +44 (0)

3 The Measurement of Links Link (optical performance) Link (physical) Link measurements Attenuation/insertion loss Installed component measurements Attenuation/ insertion loss Return loss

4 The Measurement of Channels Channel (physical) Channel (optical performance) Transceiver T R R T Transceiver Channels measurements Attenuation/insertion loss Propagation delay Installed component measurements Attenuation/ insertion loss Return loss

5 The Measurement of Channels Channel (physical) Channel (optical performance) Transceiver T R R T Transceiver Channels measurements Attenuation/insertion loss Propagation delay Installed component measurements Attenuation/ insertion loss Return loss

6 Measurement Errors - Interface Connections Link measurements Attenuation/insertion loss Channels measurements Attenuation/insertion loss Propagation delay MEAUREMENT ERROR due to INTERFACE CONNECTION Installed component measurements Attenuation/ insertion loss Return loss MEAUREMENT ERROR due to INTERFACE CONNECTION

7 Measurement Errors - LM Link measurements Attenuation/insertion loss Channels measurements Attenuation/insertion loss Propagation delay MEAUREMENT ERROR due to LAUNCHE MOAL ITRIBUTION (MMF) Installed component measurements Attenuation/ insertion loss Return loss MEAUREMENT ERROR due to LAUNCHE MOAL ITRIBUTION (MMF)

8 tatistical Behaviour of Connecting Hardware L A L A T Reference measurement P 0 Connection AT measurement P 1 L B L B T Reference measurement P 0 Connection BT measurement P 1 L C L C T Reference measurement P 0 Connection CT measurement P 1 AT BT CT

9 tatistical Behaviour of Connecting Hardware IO/IEC (2002) and EN Attenuation (db max) Wavelength All Multimode OF inglemode OF 95%<0,5dB 100%<0,75 db

10 Conventional Test Methods LINK L Launch cord Reference measurement P 0 Measured loss L Launch cord Link Tail cord Test measurement P 1 CHANNEL L Launch cord ummy cord Tail cord Reference measurement P 0 Measured loss L Launch cord Channel Tail cord Test measurement P 1

11 Interface Measurement Error Forecast: One Connection 1,000 Trials Frequency Chart 0 Outliers <99.8%<0.75 Forecast: Two Connections 1,000 Trials Frequency Chart 0 Outliers <100%<1.35

12 Improving Interface Error for L MMF Launch cord ummy cord Tail cord Terminations made with sized-ferrule M components MF Launch cord ummy cord Tail cord Terminations made with sized-ferrule M components against reference cords

13 ingle Test L Method L Launch cord ummy cord Tail cord Reference measurement P 0 Measured loss L Launch cord Cabling under test Tail cord Test measurement P 1 L Launch cord Tail cord Reference measurement P 0 L Reference measurement P 1 Tail cord ummy cord Launch cord L Launch cord Measured loss Tail cord Test measurement P 1 L Test measurement P 1 Tail cord Cabling under test Launch cord

14 The Impact of Modes on MMF Testing The number of modes = function {(N.A x core diameter)/(λ)} n 1 (r) n 2 Mode Group 1 Modes 2 Σ Modes / nm Mode Group 1 Modes 2 Σ Modes / nm Mode Group 1 Modes 2 Σ Modes ,5/ nm Mode Group 1 Modes 2 Σ Modes 2 62,5/ nm

15 Mode Groups and Power istribution The number of modes = function {(N.A x core diameter)/(λ)} n 1 (r) n 2 Mode Group 1 Modes 2 Σ Modes / nm Mode Group 1 Modes 2 Σ Modes / nm Mode Transfer Function Mode Power istribution (normalised) Cumulative Power istribution (normalised) Mode Group (normalised)

16 Testing installed cabling - they know not what they do! Investigating Modal istributions

17 Launched Modal istribution - LM OVERFILLE LAUNCH X-axis = Mode Group (normalised) EQUILIBRIUM TYLE LAUNCH VCEL LAUNCH Mode Transfer Function Mode Power istribution (normalised) Cumulative Power istribution (normalised)

18 Coupled Power Ratio - MMF L MMF/125 cord Reference measurement P 0 L MMF/125 cord MF cord CPR measurement P nm nm 50/ nm db 0.8-1% 50/ nm db % 62.5/ nm db % 62.5/ nm db 0.63%-0.8% HOW TO OBTAIN THE CORRECT CPR The right light source Modify the launch using: Mandrels? Mode conditioning?

19 tandardised MP Normalised power 0.5 Allowed distribution must not enter shaded areas Normalised mode group HOW TO OBTAIN THE CORRECT MP The right light source Modify the launch using: Mandrels? Mode conditioning?

20 Mandrels? 62.5/125 High NA source NO MANREL Mode Transfer Function Mode Power istribution (normalised) Cumulative Power istribution (normalised) WITH MANREL 62.5/125 Medium NA source 62.5/125 Low NA source Mode Group (normalised) Mode Transfer Function Mode Power istribution (normalised) Cumulative Power istribution (normalised)

21 FIA-ponsored Mode Conditioning Cords 25.8 Output CPR vs Input CPR output CPR, db input CPR, db Opportunity for universal test cords

22 New Test ystems - I Link measurements Attenuation/insertion loss Channels measurements Attenuation/insertion loss Propagation delay MEAUREMENT ERROR due to INTERFACE CONNECTION Reduced Installed component measurements Attenuation/ insertion loss Return loss Reduced MEAUREMENT ERROR due to INTERFACE CONNECTION

23 New Test ystems - II Link measurements Attenuation/insertion loss Channels measurements Attenuation/insertion loss Propagation delay MEAUREMENT ERROR due to LAUNCHE MOAL ITRIBUTION (MMF) Removed Installed component measurements Attenuation/ insertion loss Return loss Removed MEAUREMENT ERROR due to LAUNCHE MOAL ITRIBUTION (MMF)

24 Testing installed cabling - they know not what they do! Universal Test Results tandardised LM and low error connections offers universality of test equipment and comparison of results

25 Testing Installed Cabling - we know not what we do! Mike Gilmore FIA Technical irector