BS EN 61300-3-19-1997 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Examinations and measurements - Polarization dependence on.pdf

1、BRITISH STANDARD BS EN 61300-3-19: 1997 IEC 61300-3-19: 1997 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3: Examinations and measurements Section 19: Polarization dependence of return loss of a single-mode fibre optic component The European S

2、tandard EN61300-3-19:1997 has the status of a BritishStandard ICS33.180.20BSEN61300-3-19:1997 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comesintoeffect on 15July1997 BSI 09-1999 ISB

3、N 0 580 27703 8 National foreword This British Standard is the English language version of EN61300-3-19:1997. It is identical with IEC61300-3-19:1997. The UK participation in its preparation was entrusted by Technical Committee EPL/86, Fibre optics, to Subcommittee EPL/86/2, Interconnecting devices

4、and passive components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European deve

5、lopments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that Annex ZA lists normative references to international publications with their corresponding European publi

6、cations. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standar

7、d does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an

8、 inside front cover, pagesi andii, theEN title page, pages2 to9 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date C

9、ommentsBSEN61300-3-19:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN61300-3-19 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61300-3-19 April 1997 ICS33.180.20 English version Fibre optic interconnecting devices and passive components Basic

10、 test and measurement procedures Part3-19: Examinations and measurements Polarizationdependence of return loss of a single mode fibreoptic component (IEC61300-3-19:1997) Dispositifs dinterconnexion et composants passifs fibres optiques Mthodes fondamentales dessais et de mesures Partie3-19: Examens

11、et mesures Influence de la polarisation sur la puissance rflchie dun composant fibres optiques monomodes (CEI61300-3-19:1997) Lichtwellenleiter Verbindungselemente und passive Bauteile Grundlegende Prf- und Meverfahren Teil3-19: Untersuchungen und Messungen Reflexionsdmpfung in Abhngigkeit von der P

12、olarisation bei einem Einmoden-Lichtwellenleiter-Bauteil (IEC61300-3-19:1997) This European Standard was approved by CENELEC on1997-03-11. 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 na

13、tional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version

14、 in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, Fran

15、ce, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cent

16、ral Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN61300-3-19:1997 EEN61300-3-19:1997 BSI 09-1999 2 Foreword The text of document86B/851/FDIS, future edition1 of IEC61300-3-19, p

17、repared by SC86B, Fibre optic interconnecting devices and passive components, of IEC TC86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61300-3-19 on1997-03-11. The following dates were fixed: Annexes designated “normative” are part of the body of the

18、 standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC61300-3-19:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 General 3 1.1 Scope and object 3 1.

19、2 Normative reference 3 2 General description 3 2.1 Method A 3 2.2 Method B 3 3 Apparatus 4 3.1 Optical source 4 3.2 Excitation unit E 4 3.3 Polarization adjuster PA 4 3.4 Polarization independent branching device BD 5 3.5 Temporary joint TJ 5 3.6 Reference fibre RF 5 3.7 Detector 5 3.8 Terminator T

20、 6 3.9 Data read-out/recording/processing devices 6 4 Procedure 6 4.1 Precautions 6 4.2 Method A All states of polarization 6 4.3 Method B Linear polarization only 7 5 Details to be specified 8 Annex ZA (normative) Normative references to international publications with their corresponding European

21、publications 9 Figure 1 PA example for method A 4 Figure 2 PA example for method B 5 Figure 3 2 2 polarization independent branching device (BD) 6 Figure 4 Measurement set-up 6 Figure 5 Measurement set-up 7 latest date by which the ENhas to be implemented at national level by publication of an ident

22、ical national standard or by endorsement (dop) 1997-12-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow) 1997-12-01EN61300-3-19:1997 BSI 09-1999 3 1 General 1.1 Scope and object This part of IEC1300 describes the test to determine the dependence of retu

23、rn loss of a singlemode fibre optic component on the state of polarization (SOP) of the light passing through the component. Return loss is the absolute value of the ratio in decibels of the total reflected power to the incident power from an optical fibre link or system. Since the SOP of light in a

24、 component is generally indeterminate and in fact often changing as a function of time, a component that exhibits polarization dependence will have varying return loss in a system. This procedure can be applied to any singlemode passive component and interconnecting device, including attenuators, is

25、olators, branching devices, switches, connectors, and splices, if applicable. 1.2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of IEC1300. At the time of publication, the edition indicated was valid

26、. All normative documents are subject to revision, and parties to agreements based on this part of IEC1300 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid Interna

27、tional Standards. IEC875-1:1996, Fibre optic branching devices Part1: Generic specification. 2 General description The measurement is made by comparing the optical power incident on the device under test DUT with the optical power reflected along the incident path when the optical power with certain

28、 SOP is launched into the DUT. The comparison is made under different SOP. In the measurement, the DUT is usually a pigtailed fibre optic component. Both the optical power launched into the input port and reflected from the device along the incident path are monitored by tapping some of the power re

29、spectively through a polarization independent branching device. The comparison is generally facilitated by the use of automated data acquisition. Two methods for measuring the polarization dependence are described. 2.1 Method A Method A will determine the maximum polarization sensitivity over all po

30、ssible polarization states. Light is launched into the input port of the DUT such that linear, circular, and elliptical states of polarization with different axes of orientation can be adjusted while the power from the output ports is monitored. By adjusting for the maximum and minimum power through

31、 the DUT, the SOPs can result in the highest and lowest return loss of the DUT. Method A is preferred, particularly for any device in which the SOP of light passing through the device is changed. 2.2 Method B Method B will determine the maximum polarization sensitivity over all linearly polarized la

32、unch state of light passing through the device. Method B will generally understate the polarization sensitivity of return loss of devices which are not dependent on linearly polarized light. In this method, linearly polarized light is launched into the input port of the DUT. The linear SOP of the la

33、unch is typically rotated through a minimum of180 while the power reflected from the device under test is measured. If the input port of the DUT contains an integral fibre or cable pigtail, the pigtail shall be deployed in a straight line without any external stresses, for example bends, twists, kin

34、ks, or tension. This is necessary because the state of polarization carried in the fibre is altered by external stresses. 1) 1) Rashleigh, R.C., “Origins and Control of Polarization Effect in Single-Mode Fiber”, Journal of Lightwave Technology, vol.LT1#2, June1983, pp312331.EN61300-3-19:1997 4 BSI 0

35、9-1999 3 Apparatus The following apparatus and equipment are required to perform this test: 3.1 Optical source A laser source capable of producing the spectral characteristics defined in the detail specification (bothwavelength and spectral width) shall be used. Unless specified in the detail specif

36、ication, the spectral width shall be less than10nm. The source power shall be capable of meeting the dynamic range requirements of the measurement when combined with the detector sensitivity. The power shall be capable of being modulated or unmodulated as specified in the detail specification. The p

37、ower and wavelength stability of the source shall be sufficient to achieve the desired measurement accuracy over the course of the measurement. Unless otherwise specified, the power stability shall be within0,05dB. NOTEMultimode lasers may not provide sufficient polarization stability required for t

38、his measurement. 3.2 Excitation unit E This unit consists of a passive optical system which transmits the optical power to the component. Means shall be provided to ensure that higher order modes are sufficiently attenuated and the DUT is singlemoded at the wavelength of the measurement. 3.3 Polariz

39、ation adjuster PA This is a fixture or processor for adjusting the SOP of the incident optical beam for measurement purposes. It shall be compatible with the component being measured. Unless otherwise specified, the source shall be polarized to at least10 2 extinction ratio. If the source is not alr

40、eady polarized to this level, use a polarizer to maintain this extinction ratio over the range of wavelengths of the measurement. Two types of PA are recommended. 3.3.1 Method A Provide a means to reproducibly adjust the SOP of the launch through all possible states. The alignment of the system shal

41、l be adequate to ensure the reproducibility of launched power for the same orientation of the polarizer. The example in Figure 1 shows an in-line PA containing a linear polarizer P, a half-wave retardation plate H, and a quarter-wave retardation plate Q mounted on rotation stages in a collimated opt

42、ical path formed by two collimating lenses at the output of the monochromator. All of the components shall be compatible with the wavelength of the source, BD, and DUT. The P plate creates an initial linearly polarized beam at high extinction ratio regardless of the initial degree of the polarizatio

43、n of the light beam. The Q plate will change the beam to any SOP from linearly polarized through elliptical and circularly polarized. The H plate takes the SOP created by the Q plate and rotates it to any angle in the plane which is perpendicular to the direction of the propagation, while maintainin

44、g the degree of polarization. These three plates shall be aligned properly in the optical beam and the rotation angles (e.g.FP,FQ, andFH) can be adjusted respectively and accurately around their common axis. The angles shall be repeatable and clear to read. With this combination of elements, every p

45、ossible SOP can be produced. Other means to reproducibly adjust the state of polarization are permitted, for example in-line fibre polarization controllers or other polarization instrumentation as specified in the detail specification. Figure 1 PA example for method AEN61300-3-19:1997 BSI 09-1999 5

46、3.3.2 Method B For method B, the PA shall provide a means to reproducibly launch linearly polarized light and rotate it through at least180 . The alignment of the system shall be adequate to ensure the reproducibility of launched power for the same orientation of the polarizer. The example in Figure

47、 2 shows a linear polarizer P and a half-wave retardation plate H mounted on rotation stages and inserted into the collimated optical path produced at the output of the source. Other means to reproducibly adjust the state of polarization are permitted, for example in-line fibre polarization controll

48、ers or other polarization instrumentation as specified in the detail specification. 3.4 Polarization independent branching device BD This is a precisely made or selected2 2 directional branching device capable of being used at the wavelength of the optical source for measurement purposes and having

49、known characteristics. The directivity of the BD shall be better than55dB. Its splitting ratio SR of the transferring power from the input port to two output ports shall be502% at that wavelength. The characteristics of the BD shall be polarization independent. Unless otherwise specified, the polarization stability shall be DSR1%maximum. 3.5 Temporary joint TJ This is a method, device, or mechanical fixture for temporarily aligning two fibre ends into a reproducible, low loss joint, and polarization independent splic