1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationFibre optic communication subsystem test proceduresPart 1-3: General communication subsystems Central wavelength and spectral width measurementBS EN 61280-1-3:2010National forewo
2、rdThis British Standard is the UK implementation of EN 61280-1-3:2010. It isidentical to IEC 61280-1-3:2010. It supersedes BS EN 61280-1-3:1999 whichis withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeGEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic sy
3、stems andactive devices.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. BSI 2010ISBN 978 0 580 62931 0ICS 33.180
4、.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 30 June 2010.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 61280-1-3:2010E
5、UROPEAN STANDARD EN 61280-1-3 NORME EUROPENNE EUROPISCHE NORM May 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2010 CENELEC
6、- All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61280-1-3:2010 E ICS 33.180.01 Supersedes EN 61280-1-3:1999English version Fibre optic communication subsystem test procedures - Part 1-3: General communication subsystems - Central waveleng
7、th and spectral width measurement (IEC 61280-1-3:2010) Procdures dessai des sous-systmes de tlcommunication fibres optiques - Partie 1-3: Sous-systmes gnraux de tlcommunication - Mesure de la longueur donde centrale et de la largeur spectrale (CEI 61280-1-3:2010) Lichtwellenleiter-Kommunikationsunte
8、rsysteme; Grundlegende Prfverfahren - Teil 1-3: Prfverfahren fr allgemeine Kommunikationsuntersysteme - Messung von Mittelwellenlnge und Spektralbreite (IEC 61280-1-3:2010) This European Standard was approved by CENELEC on 2010-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal
9、 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 Central Secretariat or to any CENELEC membe
10、r. 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 Central Secretariat has the same status as the official versions. CENELEC
11、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, Slo
12、vakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 61280-1-3:2010EN 61280-1-3:2010 - 2 - Foreword The text of document 86C/887/CDV, future edition 2 of IEC 61280-1-3, prepared by SC 86C, Fibre optic systems and active devices, of IEC TC 86, Fibre optics, was submitted to the I
13、EC-CENELEC parallel vote and was approved by CENELEC as EN 61280-1-3 on 2010-05-01. This European Standard supersedes EN 61280-1-3:1999. This EN 61280-1-3:2010 constitutes a technical revision with changes reflecting new laser technology and includes a second method modified for state of the art ins
14、trumentation. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be imple
15、mented at national level by publication of an identical national standard or by endorsement (dop) 2011-02-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2013-05-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Internationa
16、l Standard IEC 61280-1-3:2010 was approved by CENELEC as a European Standard without any modification. _ BS EN 61280-1-3:2010- 3 - EN 61280-1-3:2010 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documen
17、ts 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. NOTE When an international publication has been modified by common modifications,
18、 indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60825-1 - Safety of laser products - Part 1: Equipment classification and requirements EN 60825-1 - IEC 62129 - Calibration of optical spectrum analyzers EN 62129 - BS EN 61280-1-3:2010 2 61280-1-3 IEC:2010(E) CON
19、TENTS 1 Scope.5 2 Normative references .5 3 Terms and definitions .5 3.1 Wavelength .5 3.2 Spectral width .6 3.3 Additional spectral characteristics .6 4 Apparatus.6 4.1 Calibrated optical spectrum analyzer.6 4.2 Power supplies7 4.3 Input signal source or modulator .7 4.4 Test cord.7 5 Test sample7
20、6 Procedure (Method A) 7 6.1 General .7 6.2 Setup 7 6.3 Adjustment of spectrum analyzer controls .8 7 Procedure (Method B) 8 7.1 Setup 8 7.2 Adjustment of spectrum analyzer controls .9 7.3 Continuous LED and SLM spectra .9 7.4 Discrete MLM spectra9 7.5 Continuous SLM spectra .10 8 Calculation .10 8.
21、1 General .10 8.2 Centre wavelength 10 8.3 Centroidal wavelength.10 8.4 Peak wavelength .11 8.5 RMS spectral width (rms) 11 8.6 n-dB spectral width (n-dB) .11 8.7 Full-width half-maximum spectral width (fwhm)11 8.8 Side-mode suppression ratio (SMSR) .12 9 Test results 12 9.1 Required information .12
22、 9.2 Information to be available on request.12 10 Example results12 Figure 1 Example of a LED optical spectrum13 Figure 2 Typical spectrum analyzer output for an MLM laser15 Figure 3 fwhmspectral width measurement for MLM laser .16 Figure 4 fwhmspectral width calculation for MLM laser16 Figure 5 Pea
23、k emission wavelength and 30dBmeasurement for SLM laser17 Table 1 Measurement points for LED spectrum from Figure 1 13 Table 2 RMS spectral characterization.14 BS EN 61280-1-3:201061280-1-3 IEC:2010(E) 5 FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 1-3: General communication subsystems C
24、entral wavelength and spectral width measurement 1 Scope This part of IEC 61280 provides definitions and measure procedures for several wavelength and spectral width properties of an optical spectrum associated with a fibre optic communication subsystem, an optical transmitter, or other light source
25、s used in the operation or test of communication subsystems. The measurement is done for the purpose of system construction and/or maintenance. In the case of communication subsystem signals, the optical transmitter is typically under modulation. NOTE Different properties may be appropriate to diffe
26、rent spectral types, such as continuous spectra characteristic of light-emitting diodes (LEDs), and multilongitudinal-mode (MLM), multitransverse-mode (MTM) and single-longitudinal mode (SLM) spectra, characteristic of laser diodes (LDs). 2 Normative references The following referenced documents are
27、 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. IEC 60825-1, Safety of laser products Part 1: Equipment classification and requirements
28、 IEC 62129, Calibration of optical spectrum analyzers 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Wavelength NOTE The following wavelength terms provide quantitative definitions for the describing the central wavelength of a spectrum. In
29、this standard, “central wavelength” is a general category label for these terms. 3.1.1 centre wavelength 0also called “half-power mid-point”, the mean of the closest spaced half-power wavelengths in an optical spectrum, one above and one below the peak wavelength 3.1.2 half-power wavelength 3dBa wav
30、elength corresponding to a half peak power value of the optical spectrum BS EN 61280-1-3:2010 6 61280-1-3 IEC:2010(E) 3.1.3 peak wavelength pthe wavelength corresponding to the maximum power value of the optical spectrum 3.1.4 centroidal wavelength cthe mean or average wavelength of an optical spect
31、rum 3.2 Spectral width 3.2.1 root-mean-square (rms) width rmsthe square root of the second moment of the power distribution about the centroidal wavelength 3.2.2 n-dB-down width n-dBthe positive difference of the closest spaced wavelengths, one above and one below the peak wavelength p, at which the
32、 spectral power density is n dB down from its peak value 3.2.3 full-width at half-maximum fwhma special case of n-dB-down width with n = 3 3.3 Additional spectral characteristics 3.3.1 side-mode suppression ratio SMSR the ratio of the largest peak of the optical spectrum to the second largest peak,
33、for a nominally SLM spectrum (see 8.8) 4 Apparatus 4.1 Calibrated optical spectrum analyzer This special-purpose test equipment uses a dispersive spectrophotometric method to resolve and record the optical spectral distribution. The required wavelength resolution and range depends on the type and va
34、riety of signals to be measured. Generally, LED sources have wide spectra with little structure so a range of at least 200 nm and resolution of 1 nm or narrower are recommended. Laser sources have much narrower spectra and may be used in wavelength-domain multiplexing (WDM) applications, where more
35、accurate determination of the wavelength is required. A wavelength resolution of 0,1 nm or narrower is recommended and the actual requirement is determined by the application. In any case, the sensitivity and wavelength range of the spectrum analyzer shall be sufficient to measure all of the spectru
36、m within at least 20 dB from the peak power. For measurement of SMSR, a larger dynamic range is typically required. OSA equipment shall be calibrated in accordance with IEC 62129. The equipment used shall have a valid calibration certificate in accordance with the applicable quality system for the p
37、eriod over which the testing is done. BS EN 61280-1-3:201061280-1-3 IEC:2010(E) 7 4.2 Power supplies As required for the device under test. 4.3 Input signal source or modulator The input signal source is a signal generator or modulator with the appropriate digital or analogue signal of the system. 4
38、.4 Test cord Unless otherwise specified, the physical and optical properties of the test cords shall match to the cable plant with which the equipment is intended to operate. The cords shall be 2 m to 5 m long, and shall contain fibres with coatings which remove cladding light. Appropriate connector
39、s shall be used. Single-mode cords shall be deployed with two 90 mm diameter loops or otherwise assure rejection of cladding modes. If the equipment is intended for multimode operation and the intended cable plant is unknown, the fibre size shall be 50/125 m. 5 Test sample The test sample shall be a
40、 specified fibre optic subsystem, transmitter, or light source. The system inputs and outputs shall be those normally seen by the user. The spectral width parameters are typically used for characterizing MLM and LED transmitters. The width of MTM and SLM lasers without modulation are normally too na
41、rrow to measure with the dispersive spectral instruments used with this method. Modulated SLM transmitters have broadened linewidths for high data rates (above about 2,5 Gb/s) and due to chirp that may be measurable by this method. WARNING Exercise care to avoid possible eye damage from looking into
42、 the end of an energized fibre from any light source. Most importantly, avoid looking into any energized fibre using any type of magnification device. The requirements in IEC 60825-1 shall be followed. 6 Procedure (Method A) 6.1 General Method A is designed for the use of typical commercial optical
43、spectrum analyzer instruments that allow quick measurement of spectra with 1 000 wavelength samples or more, and allows for the analysis of such spectra based on all of the samples rather than selecting for example only the samples at the peaks of mode wavelengths. The previous method using a smalle
44、r number of discrete wavelength points is included in Clause 7 as Method B, for compatibility with the first edition of this standard. Method A has the advantage of easier simpler automated analysis and better representation of complex but narrow spectra, such as multitransverse-mode vertical cavity
45、 surface emitting lasers (VCSELs). Due to its convenience and prevalence in the industry, Method A is considered the reference test method. 6.2 Setup 6.2.1 Use appropriate handling procedures to prevent damage from electrostatic discharge (ESD), which can cause opto-electronic devices to fail. 6.2.2
46、 With the exception of ambient temperature, standard ambient conditions shall be used, unless otherwise specified. The ambient or reference point temperature shall be 23 C 2 C, unless otherwise specified. BS EN 61280-1-3:2010 8 61280-1-3 IEC:2010(E) 6.2.3 Unless otherwise specified, apply a modulate
47、d input signal to the optical source. Allow sufficient time (per manufacturers recommendation or as specified in the detail specification) for the optical source/transmitter to reach a steady-state temperature. 6.2.4 Turn the optical spectrum analyzer on, and allow the recommended warm-up and settli
48、ng time to achieve rated measurement performance level. 6.2.5 Connect the optical output of the optical source under test to the optical input connector of the optical spectrum analyzer. If the transmitter under test does not include isolation from back-reflections, as often the case at 850 nm, thes
49、e reflections can cause the spectrum to be unstable and should be reduced with high return-loss connections and possibly external isolation or attenuation at the transmitter output. 6.3 Adjustment of spectrum analyzer controls 6.3.1 Using the resolution control, select an appropriate resolution (see 4.1). Typically less than 1/10 of the spectral width to be measured, or the finest available resolution bandwidth (0,1 nm or narrower) should be used
