Specification of Fusion Splice Loss - FIA TSD Mike Gilmore FIA Technical Director

Transcription

1 Specification of Fusion Splice Loss - FIA TSD Mike Gilmore FIA Technical Director

2 Mike Gilmore Standards Activities Member: ISO/IEC JTC1 SC25 WG3: Generic Cabling ISO/IEC JTC1 SC25 Project Team: SOHO Convenor: ISO/IEC JTC1 SC25 WG3 IPTG: Industrial Premises Cabling Convenor: CENELEC TC215 WG1: IT Cabling CENELEC TC215 WG1 PT Industrial Premises Cabling Secretary: CENELEC TC215 WG1 PT Data Centre Cabling Mike Gilmore Senior Partner, The Cabling Partnership Managing Director e-ready Building Chairman: BSI TCT7/-/1: IT Cabling BSI TCT7/-/3: IT Cabling Support Group Technical and Standards Director: Fibreoptic Industry Association Mobile: +44 (0)

3 Existing Standards for OF Cabling Components ISO/IEC Ed. 2 (2002) AND (BS) EN (2002) CABLED OPTICAL FIBRE Attenuation coefficient (dbkm -1 max) Wavelength 850nm 1300nm 50/125 or 62.5/125 50/125 OM1 OM2 OM3 Wavelength OS1 3,5 1310nm 1,0 1,5 1550nm 1,0 OS2* OS1 1,0 0,4 1,0 0,4 MMF SMF ISO/IEC Ed. 2 (2002) AND (BS) EN (2002) CONNECTING HARDWARE Attenuation (db max) Wavelength All OM1, OM2, OM3 Connection Splice 95%<0,5 100%<0,75 100%<0,3 OS1, OS2* Wavelength Connection Splice All 95%<0,5 100%<0,75 100%<0,3 ANSI/TIA/EIA-568-B.3 CONNECTING HARDWARE Wavelength Connection Splice Wavelength Connection Splice Attenuation (db max) All 100%<0,75 100%<0,3 All 100%<0,75 100%<0,3 * standard in development

4 Premises Cabling TO CP FD BD CD PREMISES CABLING ISO/IEC (BS) EN Telecommunications Outlet Consolidation Point Floor Distributor Building Distributor Campus Distributor TO TO TO TO TO CP Horizontal cabling FD FD Building backbone cabling BD Campus backbone cabling CD CC = Crossconnect Panel PP= Patch Panel Transmission channel BD CD CC PP PP CC FD BD Building backbone cabling Campus backbone cabling CC PP PP CC

5 WAN Cabling - Singlemode Technology Transmission channel CC PP PP CC Attenuation Wavelength 1310nm 1550nm OS2* OS1 0,4 dbkm 1,0-1 0,4 dbkm 1,0-1 Splice 0,3 db Based on a splice every 1000 metres then 75% of loss comes from splices UNACCEPTABLE

6 Which singlemode would you like, Sir? Chromatic Dispersion Coefficient +ve -ve ITU-T G.652 ITU-T G.655 ITU-T G Wavelength (nm) G Characteristics of a single-mode optical fibre cable G Characteristics of a dispersion-shifted single-mode optical fibre cable G Characteristics of a cut-off shifted single-mode optical fibre cable G Characteristics of a non-zero dispersion shifted single-mode optical fibre cable IEC TYPE B1.1 TYPE B1.2 TYPE B1.3 TYPE B2 TYPE B4 equivalent to G652a G654a G652c G653a G655a G656 G652b G654b G652d G653b G655b G654c G655c

7 Mode Field Diameter MODE FIELD DIAMETER (µm) Limit +/- tolerance Extreme limits Wavelength Minimum OS1 Maximum OS1 Minimum OS1 Maximum OS1 B nm 8,6 1,0 +/- 0,7 9,5 1,0 +/- 0,7 1,0 7,9 10,2 1,0 B nm 8,6 1,0 +/- 0,7 9,5 1,0 +/- 0,7 1,0 7,9 10,2 1,0 Wavelength Minimum OS1 Maximum OS1 Minimum OS1 Maximum OS1 B nm 9,5 1,0 +/- 1,0 13,0 +/-1,0 1,0 8,5 14,0 1,0 B2 1550nm 7,8 1,0 +/- 0,8 8,5 1,0 +/- 0,8 1,0 7,0 1,0 9,3 B4 1550nm 8,0 1,0 +/- 0,7 11,01,0 +/- 0,7 1,0 7,3 11,7 1,0 B1.1 B1.3 B1.2 B2 B4 7,0 8,0 9,0 10,0 11,0 12,0 13,0 14,0

8 Splicing Technology Options CORE ALIGNMENT SPLICING TECHNOLOGY Mode Field Diameter (MFD) Splice loss = MFD mismatch + processing variations CLADDING ALIGNMENT SPLICING TECHNOLOGY Splice loss = MFD mismatch + processing variations + core concentricity error

9 Mode Field Diameter Mismatch FIBRE 1 FIBRE 2 d 1 Splice loss (MFD) d 2 = log 10 (d 1 /d 2 + d 2 /d 1 ) MFD 1 MFD 2 Splice loss (db) MFD 1 MFD 2 8,0 +/- 0,7 9,0 +/- 0,7 10,0 +/- 0,7 11,0 +/- 0,7 12,0 +/- 0,7 13,0 +/- 0,7 14,0 +/- 0,7 8,0 +/- 0,7 9,0 +/- 0,7 10,0 +/- 0,7 11,0 +/- 0,7 12,0 +/- 0,7 13,0 +/- 0,7 14,0 +/- 0,7 RESULTING INDIVIDUAL SPLICE LOSS (db max.) 0,14 0,28 0,11 0,22 > 0,3 0,08 0,19 0,08 0,17 0,08 0,15 0,08 0,25 0,13 0,07

10 Incompatibility MODE FIELD DIAMETER (µm) Limit +/- tolerance Extreme limits Wavelength Minimum OS1 Maximum OS1 Minimum OS1 Maximum OS1 B nm 8,6 1,0 +/- 0,7 9,5 1,0 +/- 0,7 1,0 7,9 10,2 1,0 B nm 8,6 1,0 +/- 0,7 9,5 1,0 +/- 0,7 1,0 7,9 10,2 1,0 Wavelength Minimum OS1 Maximum OS1 Minimum OS1 Maximum OS1 B nm 9,5 1,0 +/- 1,0 13,0 +/-1,0 1,0 8,5 14,0 1,0 B2 1550nm 7,8 1,0 +/- 0,8 8,5 1,0 +/- 0,8 1,0 7,0 1,0 9,3 B4 1550nm 8,0 1,0 +/- 0,7 11,01,0 +/- 0,7 1,0 7,3 11,7 1,0 B1.1 B1.3 B1.2 B2 B4 7,0 8,0 9,0 10,0 11,0 12,0 13,0 14,0

11 A Specification Minefield SPLICE TYPE SAME PRODUCT SAME TYPE SPLICE DEFINITION Two optical fibres from a single IEC Type with: the same nominal MFD; subject to the applicable tolerances. Two optical fibres from a single IEC Type A low loss specification can be applied A higher loss specification can be applied - but only for specific Types DIFFERENT TYPE UNKNOWN Two optical fibres known but different IEC Types Two optical fibres of unknown provenance A specification can be applied - but only for specific products within each Type SAME MFD Two optical fibres from different IEC Types with: the same nominal MFD; subject to the applicable tolerances. No loss specification can be applied A low loss specification can be applied - after ensuring that wavelength conversation has been applied to the MFD values

12 Specification of Individual Splice Loss Transmission channel CC PP PP CC Splice loss (db) Low loss limit Controls workmanship Poor Yield High Re-work High loss limit Allows poor workmanship 100% Yield 0% Re-work

13 Specification of Average Splice Loss Transmission channel CC PP PP CC Individual splice loss (db) 0,0 db 0,15 db Average splice loss (db) 0,0 db 0,06 db

14 Behaviour of Average Splice Loss Max. average splice loss (db) No. of splices

15 FIA Technical Support Documents TSD DESIGN OPERATION INSTALLATION SAFETY OPTICAL FIBRE CABLING: LAN APPLICATION SUPPORT GUIDE POLARITY MAINTENANCE INSTALLATION PRACTICE: SPLICING TESTING OF INSTALLED CABLING: ATTENUATION USING LSPM EQUIPMENT TESTING OF INSTALLED CABLING: ATTENUATION USING OTDR EQUIPMENT OPTICAL POWER: SAFETY LEVELS OPTICAL FIBRE: HANDLING OF PROCESSING CHEMICALS OPTICAL FIBRE: DISPOSAL OF WASTE

16 FIA Recommended Limits - Single Splices CORE ALIGNMENT SPLICING TECHNOLOGY MMF SMF ISO/IEC Ed. 2 (2002), (BS) EN (2002) and ANSI/TIA/EIA-568-B.3 Attenuation (db max) Wavelength All Splice 100%<0,3 Wavelength All Splice 100%<0,3 CLADDING ALIGNMENT SPLICING TECHNOLOGY

17 FIA Recommended Limits - Multiple Splices CORE ALIGNMENT SPLICING TECHNOLOGY Single splice (db max.) Average for 2 splices (db max.) Average for 3 splices (db max.) Average for 4 splices (db max.) Average for 5 splices (db max.) Average for 10 splices (db max.) G652 G655 a, b, c, d a, b and c B1.1 B1.3 B4 1310nm 1550nm 0,3 0,3 0,09 1,0 0,08 1,0 0,08 1,0 0,07 0,12 1,0 0,10 1,0 0,09 1,0 0,08 0,06 0,08 ITU-T IEC Wavelength CLADDING ALIGNMENT SPLICING TECHNOLOGY

18 A Question of Measurement FIA IEC and FIA-TSD Bi-directional measurement required AVERAGE SPLICE LOSS A-H = (Y 1 -(A 1 +B 1 +C 1 +D 1 +E 1 +F 1 +G 1 +H 1 ))/7 AVERAGE SPLICE LOSS H-A = (Y 2 -(A 2 +B 2 +C 2 +D 2 +E 2 +F 2 +G 2 +H 2 ))/7 AVERAGE SPLICE LOSS = 0.5 [(AVERAGE SPLICE LOSS A-H) + (AVERAGE SPLICE LOSS H-A)] A 1 H 2 B 1 G 2 C 1 F 2 Y 1 (db) D 1 Y 2 (db) E 2 E 1 D 2 F 1 C 2 G 1 B 2 H 1 A 2

19 Splicing Technology Options CORE ALIGNMENT SPLICING TECHNOLOGY Mode Field Diameter (MFD) Splice loss = MFD mismatch + processing variations CLADDING ALIGNMENT SPLICING TECHNOLOGY Splice loss = MFD mismatch + processing variations + core concentricity error

20 Commercial Viability THE CLIENTS PERSPECTIVE Excessively low splice loss specifications can result in: delays to project completion; additional costs (labour resource) in meetings, re-negotiation or arbitration of outcomes; additional costs associated with attenuation of system components. Unclear splice loss specifications can result in: delays to project completion; additional costs (labour resource) in meetings, re-negotiation or arbitration of outcomes. THE INSTALLERS PERSPECTIVE Excessively low and/or unclear splice loss specifications can result in: delays to project completion; additional costs (labour resource) in rework of completed splice closures: additional costs (labour resource) in meetings, re-negotiation or arbitration of outcomes; reduction in profit due to late payment; delayed onset of other work; damage to reputation. EVERYONE S PERSPECTIVE It is in everyone s interest to agree a clear, technically feasible and commercially viable set of limits

21 Rework Levels CORE ALIGNMENT SPLICING TECHNOLOGY 25 G655 a, b and c Type B4 SMF 20 % Rework G652 a, b, c and d Type B1.1, B1.3 SMF 5 PLEASE NOTE: FIGURES ARE INDICATIVE ONLY ERROR MAY EXCEED 5% Max. allowed loss db (10 splice average)

22 Rework Levels CLADDING ALIGNMENT SPLICING TECHNOLOGY 25 G655 a, b and c Type B4 SMF 20 % Rework G652 a, b, c and d Type B1.1, B1.3 SMF 5 PLEASE NOTE: FIGURES ARE INDICATIVE ONLY ERROR MAY EXCEED 5% Max. allowed loss db (10 splice average)

23 Cost of Rework SYSTEM TOPOLOGY Example of 8% rework a 12-element cable might require every splice closure to be reworked a 4-element cable might only could require every third splice closure to be reworked RESOURCE ALLOCATION Rework requires continuous presence of both splicing and testing team COST PER SPLICE Can easily exceed original installation cost

24 Technical Checklist INSTALLERS PREPARE THE WORK AREA PREPARE THE FUSION SPLICING EQUIPMENT DO PREPARE AND CLEAN CABLE ELEMENTS APPLY THE SPLICE PROTECTION SLEEVE PREPARE THE PRIMARY COATING STRIPPING TOOL REMOVE OPTICAL FIBRE PRIMARY COATING DO CLEAN THE FIBRE TO REMOVE REMAINING COATING DEBRIS, CABLE GEL RESIDUE ETC. CLEAVE THE FIBRE SPLICE THE FIBRE DO cleave angle: cracks: roll-off or lip: dust contamination: splice programme: PROTECT THE SPLICE

25 Conclusions INSTALLATION INSTALLATION PRACTICE: SPLICING GUIDELINES TO SPECIFIERS specify incompatible fibres! DON T specify maximum individual splice losses of less than 0,3dB set unrealistic average splice loss requirements - design systems with realistic power budgets include specifications for the MFD of the fibre to be used as well as the generic type. DO use the FIA guidelines to set maximum average splice losses be clear about the meaning of average splice loss - only specify average losses for splices in the same segment or channel (i.e. do not specify an average splice loss per joint closure) GUIDELINES TO INSTALLERS DON T DO quote for contracts where the optical fibres involved are not fully specified consider the system topology calculate the amount of rework and its cost before quoting for a contract. adopt best practices when using splicing equipment

26 Acknowledgements INSTALLATION INSTALLATION PRACTICE: SPLICING Fibreoptic Industry Association Optilan TRITEC Developments Limited Mike Gilmore John Colton Mike Haynes Andy Toal Brendan Ward David Myers Furukawa Electric Europe Limited Fujikura Europe Limited Sumitomo Electric Europe Limited Adrian Wood Ian Tweedle David Randall Yakeen Patel