Bsi bs en 50411 3 3 2011

BS EN 50411-3-3:2011 BSI Standards Publication Fibre organisers and closures to be used in optical fibre communication systems — Product specifications Part 3-3: Singlemode optical fibre fusion splice protectors BS EN 50411-3-3:2011 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 50411-3-3:2011 The UK participation in its preparation was entrusted to Technical Committee GEL/86/2, Fibre optic interconnecting devices and passive components A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2012 ISBN 978 580 70628 ICS 33.180.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2012 Amendments issued since publication Date Text affected BS EN 50411-3-3:2011 EUROPEAN STANDARD EN 50411-3-3 NORME EUROPÉENNE December 2011 EUROPÄISCHE NORM ICS 33.180.20 English version Fibre organisers and closures to be used in optical fibre communication systems Product specifications Part 3-3: Singlemode optical fibre fusion splice protectors Organiseurs et btiers de fibres destinés être utilisés dans les systèmes de communication par fibres optiques Spécifications de produits Partie 3-3: Protecteurs d’épissures par fusion de fibres optiques unimodales LWL-Spleißkassetten und -Muffen für die Anwendung in LWLKommunikationssystemen Produktnormen Teil 3-3: Fusionsspleißschutze für Einmodenfasern This European Standard was approved by CENELEC on 2011-11-14 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 50411-3-3:2011 E BS EN 50411-3-3:2011 EN 50411-3-3:2011 Contents 1 1.1 1.2 1.3 1.4 1.5 1.6 -2- Page Scope 6 Product definition Interoperability 6 Expected performance 6 Operating environment 6 Reliability 6 Quality assurance 6 2 Normative references 6 3 Description 7 3.1 Fusion splice protector 7 3.1.1 General 7 3.1.2 Heat shrinkable splice protector type 8 3.1.3 Fold over or clam shell splice protector type 8 3.2 Materials 9 3.3 Dimensions 9 3.4 Colour and marking 9 4 Variants 9 5 Dimensional requirements 11 5.1 Heat shrinkable splice protector (S type) 11 5.2 Fold over or clam shell splice protector (F type) 13 6 6.1 6.2 6.3 6.4 Tests 13 Introduction 13 Test sample preparation 13 Test and measurement methods 13 Pass/fail criteria 14 7 Test report 14 8 Performance requirements 14 8.1 Dimensional and marking requirements 14 8.2 Installation requirement 14 8.3 Optical performance requirements 15 Annex A (normative) Fibre type 20 Annex B (normative) Sample size and product sourcing requirements 21 Annex C (normative) Test sample description and installation 22 C.1 Test sample layout for single fibre fusion splice protector 22 C.2 Preparation of single fibre test samples 22 C.3 Test sample layout for ribbon fibre fusion splice protector 24 C.4 Preparation of ribbon fibre test samples 24 Annex D (informative) Silicone band heat shrink fusion splice protectors 26 -3- BS EN 50411-3-3:2011 EN 50411-3-3:2011 Figures Figure — Heat shrinkable splice protector 8 Figure — Fold over or clam shell splice protector 8 Figure — Single fibre splice protector variant S1 as assembled 11 Figure — Ribbon fibre splice protectors variants S2, S3, S4, S5 as assembled 11 Figure — Single fibre splice protector variant S1 (fully recovered) 12 Figure — Ribbon fibre splice protectors variants S2, S3, S4, S5 (fully recovered) 12 Figure — Fold over or clam shell splice protector (as delivered) 13 Figure — Fold over or clam shell splice protector (installed) 13 Figure C.1 — Test sample layout for single fibre fusion splice protector 22 Figure C.2 — Test sample preparation - Step 22 Figure C.3 — Test sample preparation - Step 23 Figure C.4 — Test sample preparation - Step 23 Figure C.5 — Test sample layout for ribbon fibre fusion splice protector 24 Figure C.6 — Test sample preparation for ribbon – Step 24 Figure C.7 — Test sample preparation for ribbon - Step 25 Figure C.8 — Test sample preparation for ribbon - Step 25 Figure D.1 — Heat shrink splice protector with silicone band 26 Figure D.2 — Typical silicone band dimensions for recovered diameters 2,2 mm to 2,4 mm 26 Tables Table — Optical fibre fusion splice protector, for category U – Variants 9 Table — Outline and maximum dimensions for heat shrinkable fusion splice protectors 12 Table — Dimensions fold over or clam shell splice protector 13 Table — Test details and requirements 15 Table A.1 — Fibre type characteristics 20 Table B.1 — Sample size per test 21 BS EN 50411-3-3:2011 EN 50411-3-3:2011 -4- Foreword This document (EN 50411-3-3:2011) has been prepared by CLC/TC 86BXA "Fibre optic interconnect, passive and connectorised components" The following dates are fixed: – – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-11-14 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-11-14 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights BS EN 50411-3-3:2011 EN 50411-3-3:2011 -5- Fibre organisers and closures to be used in optical fibre communication systems Product specifications Part 3-3: Singlemode optical fibre fusion splice protectors Description Fibre splice protector Type: Performance EN 61753-1:2007, Category U Application: Style: Fusion Operating wavelength: 260 nm to 625 nm Attenuation grades Maximum allowed change in attenuation ≤ ± 0,2 dB for protected fusion splices placed in series Fibre category EN 60793-2-50 Type B 1.1 and B 1.3 Return loss grades Not applicable Related documents: EN 60793-2-50 Optical fibres – Part 2-50: Product specifications – Sectional specification for class B single-mode fibres (IEC 60793-2-50) EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and measurement procedures (IEC 61300 series) EN 61753-1:2007 Fibre optic interconnecting devices and passive components performance standard – Part 1: General and guidance for performance standards (IEC 61753-1:2007) Outline and nominal dimensions: Product as installed or fully recovered W S type Type Fibre L H W F type L H W H L Available lengths mm mm mm F1 Single fibre 1,2 3,2 30 S1-12 Single fibre 1,25 1,25 15/20/25/30 S1-13 Single fibre 1,3 1,3 15/20/25/30 S1-16 Single fibre 1,6 1,5 15/20/25/30/40 S1-22 Single fibre 2,2 2,2 25/30/35/40/45 S1-24 Single fibre 2,4 2,4 20/25/35/40/45/60 S1-26 Single fibre 2,6 2,6 35/40/45/60 S1-32 Single fibre 3,2 3,2 45/60 S1-37 Single fibre 3,7 3,7 68 S2-37 Ribbon 3,7 3,5 40/45 S3-40 Ribbon 4,0 3,7 40/45 S4-45 Ribbon 12 4,5 4,0 25/30/40/45 BS EN 50411-3-3:2011 EN 50411-3-3:2011 1.1 -6- Scope Product definition This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements, which a singlemode fusion splice protector need to meet in order for it to be categorised as an EN standard product Although in this document the product is qualified for EN 60793-2-50 type B1.1 and B1.3 singlemode fibres it may also be suitable for fusion splice protection of multimode fibre with 125 µm diameter glass cladding and other singlemode fibres with 125 µm diameter glass cladding at other wavelengths 1.2 Interoperability The installed fusion splice protector needs to fit into optical fibre splice cassettes or splice trays This European Standard specifies the following physical interface dimensions:  cross sectional profile with width, height or diameter(in millimetres);  length (in millimetres) 1.3 Expected performance In this European Standard, the performance of the fusion splice protector is given with selected fibres as specified in Annex A 1.4 Operating environment The tests selected combined with the severities and durations are representative of an outdoor enclosed environment defined as category U in EN 61753-1 To ensure that the product can be used in closures, boxes or street cabinet for categories C, A, G and S (as defined EN 61753-1) the specified lower temperature is extended to -40 °C and requirements for temporary flooding have been added 1.5 Reliability Whilst the anticipated service life expectancy of the product in this environment is at least 20 years, compliance with this specification does not guarantee the reliability of the product This should be predicted using a recognised reliability assessment programme 1.6 Quality assurance Compliance with this specification does not guarantee the manufacturing consistency of the product This should be maintained using a recognised quality assurance programme Normative references The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 60793-2-50, Optical fibres — Part 2-50: Product specifications — Sectional specification for class B singlemode fibres (IEC 60793-2-50) EN 61300 (all parts), Fibre optic interconnecting devices and passive components — Basic test and measurement procedures (IEC 61300 all parts) -7- BS EN 50411-3-3:2011 EN 50411-3-3:2011 EN 61300-1, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 1: General and guidance (IEC 61300-1) EN 61300-2-1, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-1: Tests – Vibration (sinusoidal) (IEC 61300-2-1) EN 61300-2-4, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-4: Tests — Fibre/cable retention (IEC 61300-2-4) EN 61300-2-5, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-5: Tests — Torsion (IEC 61300-2-5) EN 61300-2-7, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-7: Tests — Bending moment (IEC 61300-2-7) EN 61300-2-9, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-9: Tests — Shock (IEC 61300-2-9) EN 61300-2-17, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-17: Tests — Cold (IEC 61300-2-17) EN 61300-2-18, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-18: Tests — Dry heat — High temperature endurance (IEC 61300-2-18) EN 61300-2-22, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-22: Tests — Change of temperature (IEC 61300-2-22) EN 61300-2-26, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-26: Tests — Salt mist (IEC 61300-2-26) EN 61300-2-45, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-45: Tests — Durability test by water immersion (IEC 61300-2-45) EN 61300-2-46, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 2-46: Tests — Damp heat cyclic (IEC 61300-2-46) EN 61300-3-3, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-3: Examinations and measurements — Active monitoring of changes in attenuation and return loss (IEC 61300-3-3) EN 61300-3-28, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-28: Examinations and measurements — Transient loss (IEC 61300-3-28) EN 61753-1:2007, Fibre optic interconnecting devices and passive components performance standard – Part 1: General and guidance for performance standards (IEC 61753-1:2007) Description 3.1 3.1.1 Fusion splice protector General A singlemode fibre fusion splice protector is a passive component, which provides mechanical and environmental protection to a single fibre or ribbon fibre fusion splice The fused fibres are protected against ingress of dust or temporary flooding by a sealing material, generally a polymer material like hot melt adhesive or mastic BS EN 50411-3-3:2011 EN 50411-3-3:2011 -8- The products described in this standard are based on various protection types:  heat shrinkable splice protector;  fold over splice protector (also called clam shell splice protector) 3.1.2 Heat shrinkable splice protector type Prior to the splicing, the splice protector is put over one of the fibre or ribbon ends After the fusion of the fibres, the splice protector is placed over the spliced area After visual centring over the fused area the splice protector is shrunk by heating equipment The typical fusion splice protector is composed of three elements: Key a reinforcement member to give rigidity after the protector is installed in the heater; an adhesive tube that will encapsulate the spliced region and bonds directly to the bare glass and primary or secondary coating of the fibres; a cross-linked polyethylene heat-shrinkable tube, which encloses the adhesive insert tube and the reinforcement member Figure — Heat shrinkable splice protector 3.1.3 Fold over or clam shell splice protector type The fused area of the optical fibre is centred and kept in place by the adhesive strips and then the splice protector is fold over and closed by the use of a crimping tool In general the following elements are available:  rigid flat strip hinged in the centre;  compressible material adhered to the flat strip Figure — Fold over or clam shell splice protector BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 14 - Unless otherwise stated in the individual test details, all attenuation measurements shall be performed at 310 nm ± 25 nm, 550 nm ± 25 nm and 625 nm ± 25 nm All optical losses indicated are referenced to the initial attenuation at the start of the test No deviation from the specified test method is allowed Unless otherwise specified, tests shall be carried out under standard atmospheric conditions according to EN 61300-1 6.4 Pass/fail criteria A product will have met the requirements of this standard provided no failures occur in any test In the event of a failure, the test shall be re run using a sample size double that of the original Test report Conformance to a performance standard shall be supported by a test report The test report shall clearly demonstrate that the tests described in Clause have been carried out in accordance with this specification and shall provide full details of the tests together with a pass/fail declaration In the case of a failure, an analysis of the cause of the failure shall be undertaken and any corrective actions taken shall be described If design changes are made, an assessment should be carried out to determine whether full or partial requalification shall be done 8.1 Performance requirements Dimensional and marking requirements Dimensions and marking of the product shall be in accordance with the requirements of 3.4 and Clause 5, and shall be measured using the appropriate EN test method 8.2 Installation requirement The success rate or yield of installation of fusion splices depends on many variables (e.g installer skills, ambient conditions, condition of tools) Typically only an estimated loss is given for the optical performance when a fusion splice is made Therefore a small percentage of the installed splices might not meet the expected performance level The loss performance of the fusion splice itself it not considered to be a part of this performance specification, however for this standard, all fusion splices (without a splice protector installed) shall have a maximum attenuation of 0,1 dB for a single fibre fusion splice or 0,2 dB for a ribbon fibre fusion splice The minimum return loss shall be 60 dB per fusion splice BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 15 - 8.3 Optical performance requirements Table — Test details and requirements No Test Change in attenuation Requirement protected fusion splices installed on one selected fibre: δIL ≤ ± 0,2 dB per circuit of protected fusion splices during the test δIL ≤ ± 0,1 dB per circuit of protected fusion splices after the test Details Method: EN 61300-3-3 Launch fibre length: ≥ m Only the fundamental mode shall propagate at the fusion splice and at the detector Source type: LD Launch conditions: The wavelength of the source shall be longer than cut-off wavelength of the fibre System stability: Better than ± 0,05 dB over the measuring period Source centre wavelengths: 310 nm ± 25 nm 550 nm ± 25 nm 625 nm ± 25 nm Detector linearity: Better than ± 0,03 dB over the dynamic range to be measured Installation of splice protector After the installation the change in attenuation shall meet the requirements of test No Method: See Annex C Vibration (Sinusoidal) During and after the test the change in attenuation shall meet the requirements of test No (for 550 nm only) Method: EN 61300-2-1 Frequency range: (10-55) Hz Constant vibration amplitude: 0,75 mm Number of cycles: 15 (10-55-10 Hz): Shock After the test the change in attenuation shall meet the requirements of test No Number of axis: mutually orthogonal axes Measurements required: During and after the test the change in attenuation shall be measured by transient loss test method EN 61300-3-28 (transient loss) at 550 nm ± 25 nm Method: EN 61300-2-9 Acceleration force: Components: 500 gn Duration shock: ms half sine pulse Number of axes: mutually orthogonal axes Number of shocks: per axis (each in different direction) Measurements required: Before and after each axis BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 16 - Table — Test details and requirements (continued) No Test Torsion Fibre/Cable retention Bending moment Cold Requirement After the test the change in attenuation shall meet the requirements of test No After the test the change in attenuation shall meet the requirements of test No After the test the change in attenuation shall meet the requirements of test No During and after the test the change in attenuation shall meet the requirements of test No Details Method: EN 61300-2-5 Magnitude of the load: 2,0 N ± 0,5 N for primary, secondary and ribbon fibres Rate of load application: 0,1 N/s Load application point: 0,2 m from end of device Number of cycles: 10 cycles at ± 180° Measurements required: Before and after the test Method: EN 61300-2-4 Magnitude of the load: 5,0 N ± 0,5 N for secondary coated fibres and ribbon fibres 2,0 N ± 0,5 N for primary coated fibres Load application point: 0,3 m from the end of device Load rate: 0,5 N/s Duration of the load: 60 s Measurements required: Before and after the test Method: EN 61300-2-7 Load: 2,0 N ± 0,2 N Duration: 5s Measurements required: Change in attenuation shall be measured before and after the test Method: EN 61300-2-17 Pre-conditioning procedure: Standard atmospheric conditions for h Temperature: -40 °C ± °C Duration of the exposure: 96 h Operating wavelength: 310 nm ± 25 nm, 550 nm ± 25 nm and 625 nm ± 25 nm Measurements required: During and after the test the change in attenuation shall be measured by test method EN 61300-3-3 Maximum sampling interval during the test: 1h Recovery procedure: Allow specimen to return to room temperature in h BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 17 - Table — Test details and requirements (continued) No 10 Test Dry heat Damp heat, cyclic Requirement During and after the test the change in attenuation shall meet the requirements of test No During and after the test the change in attenuation shall meet the requirements of test No Details Method: EN 61300-2-18 Pre-conditioning procedure: Standard atmospheric conditions for h Temperature: +70 °C ± °C Duration of the exposure: 96 h Operating wavelength: 310 nm ± 25 nm, 550 nm ± 25 nm and 625 nm ± 25 nm Measurements required: During the test the change in attenuation shall be measured by test method EN 61300-3-3 Maximum sampling interval during the test: 1h Recovery procedure: Allow specimen to return to room temperature in h Method: EN 61300-2-46 Pre-conditioning procedure: Standard atmospheric conditions for h High Temperature: +55 °C ± °C Low temperature: +25 °C ± °C Humidity: 93 % RH ± % RH Number of cycles: Duration of each cycle: 24 h Wavelength: 310 nm ± 25 nm, 550 nm ± 25 nm and 625 nm ± 25 nm Measurements required: During and after the test the change in attenuation shall be measured by test method EN 61300-3-3 Maximum sampling interval during the test: 15 Recovery procedure: Allow specimen to return to room temperature in h BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 18 - Table — Test details and requirements (continued) No 11 12 Test Change of temperature Salt mist Requirement During and after the test the change in attenuation shall meet the requirements of test No After the test the change in attenuation shall meet the requirements of test No No significant difference in visual aspect shall be noticed Details Method: EN 61300-2-22 (Test Nb) Pre-conditioning procedure: Standard atmospheric conditions for h High Temperature: +70 °C ± °C Low temperature: -40 °C ± °C Number of cycles: 12 Rate of temperature change: °C/min Duration at extreme temperatures: 1h Wavelength: 310 nm ± 25 nm, 550 nm ± 25 nm and 625 nm ± 25 nm Measurements required: During and after the test the change in attenuation shall be measured by test method EN 61300-3-3 Maximum sampling interval during the test: 15 Recovery procedure: Allow specimen to return to room temperature in h Method: EN 61300-2-26 Preconditioning procedure: h at normal ambient conditions Temperature: +35 °C ± °C Salt solution (NaCl) concentration: 5%±1% PH: Between 6,5 and 7,2 Test duration: 96 h Measurements required: Before and after the test, at standard atmospheric conditions Recovery procedure: Allow specimen to return to room temperature in h BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 19 - Table — Test details and requirements (continued) 13 Durability by water immersion During and after the test the change in attenuation shall meet the requirements of test No Method: EN 61300-2-45 Preconditioning procedure: h at normal ambient conditions Temperature: +45 °C ± °C Test duration: cycle of days Measurements required: Before and after the test, at standard atmospheric conditions Recovery procedure: Allow specimen to return to room temperature in h BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 20 - Annex A (normative) Fibre type Table A.1 — Fibre type characteristics Fibre type: Dispersion unshifted – EN 60793-2-50 Type B1.1 and B1.3 Proof stress strain: ≥1% Mode field diameter at 310 nm: 9,3 µm ± 0,7 µm Mode field diameter at 550 nm: 10,5 µm ± 1,0 µm Core concentricity error ≤ 0,8 µm Cabled fibre cut off wavelength: ≤ 260 nm 550 nm loss performance: < 0,5 dB for 100 turns on 60 mm mandrel diameter Cladding diameter: 125 µm ± µm Non coloured primary coating diameter: 245 µm ± 10 µm Coloured primary coating diameter: 250 µm ± 15 µm Secondary coating diameter: 900 µm ± 90 µm BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 21 - Annex B (normative) Sample size and product sourcing requirements Table B.1 — Sample size per test No a Test Sample size a Sourcing (test samples) Change in attenuation NA Installation 33 New Vibration (Sinusoidal) Shock Torsion Fibre retention Bending moment Cold Dry heat 10 Damp heat, cyclic 11 Change of temperature 12 Salt mist 13 Water immersion One test sample consists of fusion splice protectors on a randomly selected fibre or ribbon Tests to 13 may be performed in any order BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 22 - Annex C (normative) Test sample description and installation C.1 Test sample layout for single fibre fusion splice protector IN metre fibre with loops OUT Splice tray = Fusion splice Figure C.1 — Test sample layout for single fibre fusion splice protector C.2 Preparation of single fibre test samples A 12 m long fibre in a splice tray is connected to a light source and an optical power meter The measured optical power is taken as reference (P0) (see Figure C.2) Fibre length 12 metres Splitter P0 (dB) Fibre Detector Switch Source Reference channel IEEE 488 Interface bus Controller Figure C.2 — Test sample preparation - Step NOTE Stability of the system shall be better than 0,05 dB over period of installation BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 23 - At m from the fibre end the fibre is cut Where applicable the splice protector is put over the fibre and the fibre ends are fusion spliced together The splice protector will not be installed yet After the first fusion splice is made the optical power (P1) is measured again (see Figure C.3): Fusion splice protectors under test P1 (dB) Splitter Detector Switch Source Reference channel IEEE 488 Interface bus Controller Figure C.3 — Test sample preparation - Step The splice loss of each fusion splice i is calculated as: Splice lossi (dB) = Pi-1(dB)-Pi(dB) where I = 1, 2, …, loops Ø 60 mm Fusion splice protectors under test P5 (dB) Splitter Detector Switch Source Reference channel IEEE 488 Interface bus Controller Figure C.4 — Test sample preparation - Step In total fusion splices shall be made (Figure C.4) in series on a single fibre with a distance of m between each splice At least loops with radius 30 mm shall be made between each splice and on the fibres connected with the test equipment The maximum allowed loss for each fusion splice i (i = 1, 2, 3, 4, 5) shall be < 0,10 dB for single fibres Before installing all splice protectors the optical power in the fibre shall be measured and recorded (PB) After installation of the splice protectors the optical power shall be measured again (PA) The change in attenuation caused by the splice protectors is calculated as: Change in attenuation (dB) installation = PB(dB)-PA(dB) BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 24 - The maximum allowed change in attenuation shall be ≤ 0,10 dB after all splice protectors are installed C.3 Test sample layout for ribbon fibre fusion splice protector Ribbon IN Fibres N Ribbon loop metre N= 4, or 12 Ribbon OUT Fibres N Splice tray N= 4, or 12 = Ribbon fusion splice Figure C.5 — Test sample layout for ribbon fibre fusion splice protector C.4 Preparation of ribbon fibre test samples A 12 m long ribbon in a splice tray is connected to a light source and an optical power meter The measured optical power for each fibre j in the ribbon is taken as reference (P0j) (see Figure C.5) Ribbon length 12 metres Splitter 1:16 P0j (dB) Ribbon Detector Switch Source Reference IEEE 488 Interface bus Controller Figure C.6 — Test sample preparation for ribbon – Step NOTE Repeatability of the switch shall be better than 0,05 dB over period of installation At m from the ribbon end the ribbon is broken Where applicable the splice protector is put over the ribbon and the ribbon ends are fusion spliced together The splice protector will not be installed yet After the first splice is made the optical power (P1j) is measured again for each fibre j (j = to 4, or 12 in the ribbon) (see Figure C.7): BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 25 - loops Ø 60 mm Splice protector under test P1j (dB) Splitter 1:16 Detector Switch Source Reference IEEE 488 Interface bus Controller Figure C.7 — Test sample preparation for ribbon - Step The splice loss of the fibre j in the splice i is calculated as: Splice lossij (dB) = Pi-1,j(dB)-Pi,j(dB) loops Ø 60 mm Splice protector under test P5j (dB) Splitter 1:16 Detector Switch Source Reference IEEE 488 Interface bus Controller Figure C.8 — Test sample preparation for ribbon - Step In total fusion splices shall be made in series on a ribbon with a distance of m between each splice At least loops with radius 30 mm shall be made between every splice and on the fibres connected with the test equipment The maximum allowed loss for each fusion splice i (i = 1, 2, 3, 4, 5) shall be < 0,2 dB for each fibre j (j = to 4, or 12) in the ribbon Before installing all splice protectors the optical power in each fibre j of the ribbon shall be measured and recorded (PBj) After installation of the splice protectors the optical power in each fibre j shall be measured again (PAj) The change in attenuation for each fibre caused by the installation of the splice protectors is calculated as: Change in attenuation in fibre j (dB) installation = PBj(dB)-PAj(dB) The maximum allowed change in attenuation in each fibre j of the ribbon shall be ≤ 0,10 dB after all splice protectors are installed BS EN 50411-3-3:2011 EN 50411-3-3:2011 - 26 - Annex D (informative) Silicone band heat shrink fusion splice protectors Some types of heat shrink fusion splice protectors have a silicone band around the centre of the splice protector This band modifies the outer diameter in such a way that it will fit in a specific splice holder module The silicone sleeve recovers in proportion with the splice protector diameter during the heat shrink sleeve recovery process The silicone sleeve is heat resistant and is soft and compressible Figure D.1 shows the fitting of a heat shrink splice protector with silicone band fitted, centrally, equally spaced within ± mm Equal Equal Figure D.1 — Heat shrink splice protector with silicone band Figure D.2 shows the dimensions and tolerances of the silicone band, common to splice protectors above 2,2 mm outside diameters Typically fitted to recovered diameters 2,2 mm to 2,4 mm ±1 mm 0,3 ± 0,1 mm 2,4 ±0,1 mm Figure D.2 — Typical silicone band dimensions for recovered diameters 2,2 mm to 2,4 mm The silicone band colour is optional, but typically orange, blue or white This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Revisions We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based 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