1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Consideration on the use of OTDRs to measure return loss of single-mode optical fibre connectionsPD CLC/TR 50682:2018TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CLC/TR 50682 June 2018 ICS 33.180.01 English Ve
2、rsion Consideration on the use of OTDRs to measure return loss of single-mode optical fibre connections Examen de lutilisation de la rflectomtrie optique dans le domaine temporel (OTDR) pour la mesure de laffaiblissement de rflexion des connexions en unimodal berlegungen zur Verwendung von OTDRs zur
3、 Messung der Rckflussdmpfung von Einmoden-LWL-VerbindungenThis Technical Report was approved by CENELEC on 2018-04-16. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic
4、of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardiz
5、ation Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. CLC/TR 506
6、82:2018 ENational forewordThis Published Document is the UK implementation of CLC/TR 50682:2018.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
7、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 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 51409 8ICS 33.180.01Complia
8、nce with a British Standard cannot confer immunity from legal obligations.This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 June 2018.Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD CLC/TR 50682:2018TEC
9、HNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CLC/TR 50682 June 2018 ICS 33.180.01 English Version Consideration on the use of OTDRs to measure return loss of single-mode optical fibre connections Examen de lutilisation de la rflectomtrie optique dans le domaine temporel (OTDR) pour la mesure
10、de laffaiblissement de rflexion des connexions en unimodal berlegungen zur Verwendung von OTDRs zur Messung der Rckflussdmpfung von Einmoden-LWL-VerbindungenThis Technical Report was approved by CENELEC on 2018-04-16. CENELEC members are the national electrotechnical committees of Austria, Belgium,
11、Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Swe
12、den, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CENELEC All rights of ex
13、ploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. CLC/TR 50682:2018 EPD CLC/TR 50682:2018CLC/TR 50682:2018 (E) 2 Contents Page European foreword . 3 Introduction . 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions 5 4 Description of Samples . 5 5
14、 Test 6 6 Test results . 6 7 Conclusions 12 Annex A (informative) Test data obtained in the Round Robin 13 Bibliography 19 PD CLC/TR 50682:2018CLC/TR 50682:2018 (E) 3 European foreword This document (CLC/TR 50682:2018) has been prepared by CLC/TC 86BXA “Fibre optic interconnect, passive and connecto
15、rised components“. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights. PD CLC/TR 50682:2018CLC/TR 50682:2018 (E) 4 Introduction The introduction of n
16、ew types of optical fibre (i.e. ITU-T G.657, EN 60793-2-50 B6 type) and the differences between manufacturers products cause a spread of up to 3 dB in the backscatter values (Bs) of available telecommunications single mode fibre. The variation in this parameter can lead to large differences in measu
17、red return loss (RL) of connections. This can give issues in field measurement where the fibre type and manufacturer may be unknown and the Bs may not be updated for each measurement in the OTDR. To evaluate the real impact of this spread of backscatter vales on return loss measurement, a Round Robi
18、n Test (RRT) was designed by CLC TC86BXA in 2015. “Black-box” connections (i.e. closed boxes with a connection of two plugs and fibre with similar or different Bs values) were circulated for testing in 2016 and 2017 around several laboratories. The result of this Round Robin is intended to contribut
19、e to future specification of return loss requirements on optical components. PD CLC/TR 50682:2018CLC/TR 50682:2018 (E) 5 1 Scope The purpose of this document is to describe a round robin on return loss of single mode optical fibre connections. This includes the description of the samples, the test p
20、rocedures and test instrumentation, results and conclusions. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated referen
21、ces, the latest edition of the referenced document (including any amendments) applies. EN 61300-3-6:2009, Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-6: Examinations and measurements - Return loss 3 Terms and definitions For the purpose
22、s of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.1 return l
23、oss RL ratio of the power (Pi) incident on, or entering, the DUT to the total power reflected (Pr) by the DUT, expressed in decibels 3.2 backscatter value Bsbackscattering level of the OTDR trace is a constant (K) that includes both the Rayleigh backscattering of the fibre and the OTDR pulse duratio
24、n 4 Description of Samples The Device Under Test (DUT) was an optical fibre-to-fibre connection, protected by a box, making the connection inaccessible to the user. The patch cords used in the DUTs were provided by different manufacturers to ensure a mix of fibres. The plugs in the connection were e
25、ither SC/APC or SC/PC style which were terminated on single fibre cable 50 m in length, and the free ends were terminated with SC/APC plugs in order to create input/output ports. All the combinations were chosen in order to have a connection RL between 55 dB and 60 dB. Some of these connections were
26、 made by mixing fibres with similar BS and others using different BS. Ten DUTs (black boxes) were made in total. The samples were packed and transported in such a way as to minimize performance changes during the round robin test and retested at the end of the RRT. In Table 1, the fibre manufacturer
27、s, fibre types and mode field diameters (MFD) of the samples used in the RRT are listed, together with the backscatter values at 1 310 nm and 1 550 nm. It can be noted that the difference among BS values is higher at 1 310 nm ( 2,6 dB), than at 1 550 nm ( 0,7 dB). PD CLC/TR 50682:2018CLC/TR 50682:20
28、18 (E) 6 Table 1 BSand mode field diameter (MFD) values of fibres obtained from manufacturers publicly available datasheets Fibre Manufacturer Fibre type Mode Field Diameter (m) BS(dB 1310 nm) BS(dB 1550 nm) CORNING SMF-28e+ LL (G.652.D) SMF-28 Ultra (G.652.D & G.657.A1) SMF-28e+ (G.652.D) 9,2 0,4 a
29、t 1 310 nm 10,4 0,5 at 1 550 nm -77,0 -82,0 SMF-28 (G.652.D) 9,2 0,4 at 1 310 nm 10,4 0,8 at 1 550 nm -77,0 -82,0 DRAKA Elite Bendbright-XS (G.657.A2&B2) 8,8 0,4 at 1 310 nm 9,8 0,5 at 1 550 nm -79,1 -81,4 DRAKA ESMF (G.652.D) 9,0 0,4 at 1 310 nm 10,1 0,5 at 1 550 nm -79,4 -81,7 OFS AllWave FLEX ZWP
30、 (G.652.D & G.657.A1) 8,9 0,4 at 1 310 nm 9,9 0,5 at 1 550 nm -79,6 -82,1 5 Test 16 different laboratories (Table 2) tested the return loss of the DUTs. Not every laboratory performed all of the tests. Each of them was required to set their commercial OTDRs to the BS values reported in EN 61300-3-6:
31、2009 (i.e. Bs 80 dB for 1 310 nm, Bs 82,5 dB for 1 550 nm). Each connection (i.e. each box) was tested from both entry ports and data was reported on a dedicated form. The pulse width was not prescribed and could be chosen by each laboratory, depending on the OTDR available. Where possible, it was r
32、ecommended to avoid the use of a launch fibre, to limit further uncertainty factors. Table 2 Laboratories involved in testing the samples CommScope, Belgium LEMO F.O.U.R, UK CommScope, Netherlands Optokon, a.s., Czech Republic Corning Cable Systems Polska Sp. z o.o., Poland Optotec, Italy Diamond SA
33、, Switzerland Orange Poland, Poland EXATEL S.A., Poland Reichle de Massari, Switzerland FibreFab Ltd, UK SQS Vlaknova optika a.s., Czech Republic HARTING AG & Co. KG, Germany TDE, Germany Huber+Suhner AG, Switzerland TIM, Italy Instytut cznoci, Poland 6 Test results The combination of the variabilit
34、y in Bs and the typical commercial OTDR return loss accuracy of +/- 2 dB can lead to a measurement variation of up to 5 dB. The samples were retested at the end of the RRT by the originating laboratory and were found to have few significant changes in characteristics. See Table 3. Boxes 5, 9 and 10
35、had the highest changes. PD CLC/TR 50682:2018CLC/TR 50682:2018 (E) 7 Table 3 Test results before and after the round robin Sample No OTDR Launching Port Connection Type Measured RL dB Before Testing Measured RL dB After Testing RL Difference dB (Before-After) 1 310 nm 1 550 nm 1 310 nm 1 550 nm 1 31
36、0 nm 1 550 nm Box 1 - Port A SC/APC 55,2 57,0 55,7 56,1 -0,6 0,9 Box 1 - Port B SC/APC 56,0 57,4 56,3 56,9 -0,3 0,5 Box 2 - Port A SC/APC 57,8 59,4 57,4 58,3 0,4 1,1 Box 2 - Port B SC/APC 58,1 59,4 57,4 58,3 0,7 1,1 Box 3 - Port A SC/APC 57,9 59,4 57,3 58,8 0,6 0,6 Box 3 - Port B SC/APC 56,8 59,5 56
37、,5 57,7 0,3 1,8 Box 4 - Port A SC/APC 57,5 59,6 57,3 58,1 0,2 1,5 Box 4 - Port B SC/APC 56,4 58,2 56,3 57,7 0,1 0,5 Box 5 - Port A SC/APC 58,3 59,8 58,2 58,5 0,1 1,3 Box 5 - Port B SC/APC 58,4 60,2 58,4 57,5 0,0 2,7 Box 6 - Port A SC/APC 56,9 58,3 57,3 58,5 -0,4 -0,2 Box 6 - Port B SC/APC 57,2 58,0
38、56,4 57,9 0,8 0,1 Box 7 - Port A SC/APC 58,9 60,7 59,1 60,0 -0,2 0,7 Box 7 - Port B SC/APC 59,0 60,5 58,8 60,4 0,2 0,1 Box 8 - Port A SC/APC 57,2 58,4 56,6 58,4 0,6 0,0 Box 8 - Port B SC/APC 56,2 57,3 55,4 57,5 0,8 -0,2 Box 9 - Port A SC/PC 55,9 56,8 56,2 57,8 -0,3 -1,0 Box 9 - Port B SC/PC 55,2 56,
39、1 56,3 57,0 -1,2 -1,0 Box 10 - Port A SC/PC 63,1 61,1 59,5 61,2 3,6 -0,1 Box 10 - Port B SC/PC 61,2 60,2 60,0 61,0 1,2 -0,8 The aim of using the same BS value was not achieved, since some of the OTDRs used were not capable of setting this parameter. The collected data has been divided into two diffe
40、rent groups, depending on the pulse width (short or long). Table 4 gives the main test parameters, as declared by each laboratory. NOTE In this document,short pulse width is defined as 10 ns, long pulse width is defined as 10 ns. PD CLC/TR 50682:2018CLC/TR 50682:2018 (E) 8 Table 4 Main test paramete
41、rs set on each OTDR by the laboratories. Short Pulse Width aLong Pulse Width bOTDR Model Pulse Width ns Fibre launch m Bs 1 310 nm Bs 1 550 nm Pulse Width ns Fibre launch m Bs 1 310 nm Bs 1 550 nm Ando AQ 7250 10 3 No info No info Anritsu MW9040B 100 No info 80,0 82,5 Anritsu 9060A 100 - 80,0 82,5 A
42、nritsu 9076 D1 20 - 80 82,5 Anritsu 9076 D1 50 - 80 82,5 Anritsu MT-9083A 3 3 78,5 81,5 20 3 78,5 81,5 Anritsu MT-9083B 10 - 81,5 20 - 78,5 EXFO AXS-100 10 500 79,4 81,9 EXFO AXS-100 10 4 79,4 81,9 EXFO FTB-100B 10 4 79,4 81,9 EXFO FTB-200 10 4 79,4 81,9 EXFO FTB-7200D 100 250 80,0 82,5 EXFO FTB-730
43、 50 - 80,0 82,5 EXFO FTB-1 FTB-730C-SM2-EA 10 - 80 82,5 30 - 80 82,5 EXFO FTB-1 FTB-730-23B-04B-OPM-EA 10 - 80 82,5 50 - 80 82,5 EXFO Maxtester 730C-SM2-EA 10 - 80 82,5 50 - 80 82,5 JDSU 3168 10 100 80,0 82,5 JDSU MTS 6000 30 - 80,0 82,5 JDSU MTS 8000 30 3 81,0 81,0 Luciol LOR 200 2 - 80,0 82,5 30 3
44、 80,0 82,5 NOYES OFL-250 10 4 79,4 81,9 OPTOKON MOT-700D 10 1 000 80 80 TEKTRONIX TFP2 20 382/913 80,0 82,5 Wavetek MTS5100 5 1 000 80,2 81,7 20 1 000 80,2 81,7 Yokogawa AQ1205F 10 - 80 82,5 50 - 80 82,5 Yokogawa AQ7270 10 1 000 No info No info Yokogawa AQ7275 3 500 80,0 82,5 aShort Pulse Width: 2,
45、3, 5 and 10 ns. bLong Pulse Width: 20, 30, 50 and 100 ns. In Table 5, the minimum and maximum values and the calculated mean and standard deviation values are given for each port of the test boxes. PD CLC/TR 50682:2018CLC/TR50682:2018 (E)9Table5Minimum,maximum,meanvaluesStandarddeviationSHORTPULSEWI
46、DTH 1310nmSHORTPULSEWIDTH 1550nmLONGPULSEWIDTH 1310nmLONGPULSEWIDTH 1550nmMIN dBMAXdBMEANdBSTDEV dBMIN dBMAXdBMEANdBSTDEV dBMIN dBMAXdBMEANdBSTDEV dBMIN dBMAXdBMEANdBSTDEV dBBox1PortA53,460,355,72,0754,660,556,31,6553,758,254,81,0054,359,255,91,14Box1PortB54,561,756,52,0055,362,957,31,9953,558,955,5
47、1,1355,260,356,71,18Box2PortA56,561,758,41,5957,664,659,31,7355,461,557,51,3357,762,858,91,26Box2PortB56,766,158,62,2457,763,459,51,6455,561,457,61,3257,762,959,01,30Box3PortA56,363,458,41,8657,462,459,21,4955,361,257,51,3555,562,858,81,54Box3PortB55,863,057,81,9057,261,758,81,3954,960,756,81,2757,2
48、62,358,51,33Box4PortA56,061,357,91,6257,465,859,22,0255,160,957,11,3057,362,458,81,25Box4PortB55,861,857,61,8257,161,958,51,3854,660,356,61,2157,061,858,11,16Box5PortA55,562,657,92,0656,063,758,72,1055,160,256,81,1956,961,158,21,13Box5PortB55,361,957,81,9756,663,358,51,7951,160,156,51,9655,861,157,9
49、1,33Box6PortA55,365,457,82,4456,362,858,21,8055,360,056,81,1156,061,857,91,30Box6PortB55,160,857,11,8455,863,957,92,0354,859,756,41,1056,360,657,51,03Box7PortA58,367,860,22,2059,365,461,31,5657,563,159,21,2659,264,760,81,24Box7PortB57,965,259,81,8759,067,061,31,7957,463,159,01,3259,064,860,81,34Box8PortA54,760,857,31,8655,661,857,81,8154,759,756,31,1456,161,157,41,22Box8PortB54,362,656,62,2555,461,857,61,7054,658,955,61,0054,260,156,61,32Box9PortA5
