1、BRITISH STANDARD BS EN 61281-1:1999 IEC61281-1: 1999 Fibre optic communication subsystems Part1: Generic specification The European Standard EN61821-1:1999 has the status of a BritishStandard ICS 33.180.01BSEN61281-1:1999 This BritishStandard, having been prepared under the directionof the Electrote
2、chnical Sector Committee, was publishedunder the authority ofthe Standards Committee andcomes into effect on 15July1999 BSI03-2000 ISBN 0 580 32689 6 National foreword This BritishStandard is the English language version of EN61281-1:1999. Itis identical with IEC61281-1:1999. The UK participation in
3、 its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interp
4、retation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From1January1997, all IEC publications h
5、ave the number60000 added to the old number. For instance, IEC27-1 has been renumbered as IEC60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN a
6、nd CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The BritishStandards which implement these international or European publications may be found in the BSI Standards Catalogue under the sectio
7、n entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. C
8、ompliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to24, an inside back cover and a back cover. This standard has been updated (see copyrigh
9、t 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 CommentsBSEN61281-1:1999 BSI 03-2000 i Contents Page National foreword Inside front cover Foreword 2 Text of EN61281-1 3ii blan
10、kEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN61281-1 April 1999 ICS 33.180.01 English version Fibre optic communication subsystems Part1:Genericspecification (IEC61281-1:1999) Sous-systmes de tlcommunications parfibres optiques Partie1: Spcification gnrique (CEI61281-1:1999) Lichtwellenleite
11、r- Kommunikationsuntersysteme Teil1: Fachgrundspezifikation (IEC61281-1:1999) This European Standard was approved by CENELEC on1999-04-01. 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
12、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
13、 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, Czech Republic, Denmar
14、k, Finland, France, 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 Elektrotechnis
15、che Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1999 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN61281-1:1999 EEN61281-1:1999 BSI 03-2000 2 Foreword The text of document86C/225/FDIS, future edition1 of IEC612
16、81-1, prepared by SC86C, Fibre optic systems and active devices, of IEC TC86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN61281-1 on1999-04-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annex
17、es designated “informative” are given for information only. In this standard, Annex ZA is normative and Annex A and Annex B are informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC61281-1:1999 was approved by CENELEC as a European Standard wi
18、thout any modification. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Symbols and acronyms 12 4.1 Symbols 12 4.2 Acronyms 12 5 Subsystem characteristics 13 5.1 General aspects 13 5.2 Digital fibre optic subsystems 16 5.2.1 General description 16 5.2.2 Digital subsyste
19、m characteristics 16 5.2.3 Digital transmitter characteristics 16 5.2.4 Digital receiver characteristics 17 5.2.5 Digital regenerator characteristics 18 5.3 Analogue fibre optic subsystems 18 5.3.1 General description 18 Page 5.3.2 Analogue subsystem characteristics 18 5.3.3 Analogue transmitter cha
20、racteristics 19 5.3.4 Analogue receiver characteristics 20 5.3.5 Analogue repeater characteristics 20 5.4 Fibre optic links 21 5.4.1 General description 21 5.4.2 Fibre optic cable plant characteristics 21 5.4.3 Fibre optic cable section characteristics 21 5.4.4 Fibre optic splice and connector chara
21、cteristics 21 5.4.5 Optical device characteristics 21 5.4.6 Optical fibre amplifier characteristics 22 Annex A (informative) Document classification scheme for IEC61280, IEC61282 and IEC61290 23 Annex B (informative) Bibliography 24 Annex ZA (normative) Normative references to international publicat
22、ions with their corresponding European publications Inside back cover Figure 1 The simplest basic fibre optic system 14 Figure 2 A more complex BFOS 14 Figure 3 Interconnected BFOSs forming a fibre optic subsystem 15 Figure 4 A BFOS with multiport terminal devices 15 Table 1 Digital subsystem charac
23、teristics 16 Table 2 Digital transmitter characteristics 17 Table 3 Digital receiver characteristics 17 Table 4 Digital regenerator characteristics 18 Table 5 Analogue subsystem characteristics 19 Table 6 Analogue transmitter characteristics 19 Table 7 Analogue receiver characteristics 20 Table 8 An
24、alogue repeater characteristics 20 Table 9 Fibre optic cable plant characteristics 21 Table 10 Optical device characteristics 22 Table 11 Optical fibre amplifier characteristics 22 latest date by which the ENhas to be implemented at national level by publication of an identical national standard or
25、by endorsement (dop) 2000-01-01 latest date by which the national standards conflicting with the EN haveto be withdrawn (dow) 2002-01-01EN61281-1:1999 BSI 03-2000 3 1 Scope This part of IEC61281 is a generic specification for fibre optic communication subsystems (FOCSs), and is structured according
26、to the IEC Quality Assessment System (IECQ). Subsystems are classified in families having a common sectional specification. Each sectional specification is supplemented by blank detail specifications, and detail specifications appropriate to the specific individual type or types of subsystems. The p
27、arameters defined herein form a specifiable minimum set of specifications that are common to all fibre optic subsystems. Additional parameters may be needed depending on the particular application and technology. Those additional parameters will be specified in the relevant sectional specification a
28、nd/or detail specification, as appropriate. Each specified parameter may be measured using one of the test procedures. The use of these parameters for system design is given in design guides. 2 Normative references The following normative documents contain provisions which, through reference in this
29、 text, constitute provisions of this part of IEC61281. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based on this part of IEC61281 are encouraged to investigate the possibility of applying the most recent ed
30、itions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC60793-2:1992, Optical fibres Part2: Product specification. IEC60794-2:1989, Optical fibre cables Part2: Product specification. IEC60874-1:1993, Connectors for o
31、ptical fibres and cables Part1: Generic specification. IEC61291-1:1998, Optical fibre amplifiers Part1: Generic specification. 3 Definitions For the purpose of this part of IEC61281, the following functional and operational definitions apply. Within a definition, terms defined elsewhere are in itali
32、cs. 3.1 active optical device an optical device having gain of power NOTEExamples include active branching devices, optical amplifiers, optical modulators, optical regenerators, and optical repeaters. 3.2 attenuation the reduction of power (expressed in dB) between the end points of a fibre optic ca
33、ble plant or of a passive optical device 3.3 attenuator, optical a passive optical device which produces a controlled signal attenuation when inserted in the optical path 3.4 bandwidth the difference (expressed in Hz) between the highest and lowest modulation frequencies at which the modulus of the
34、power spectrum or of the complex transfer function is one-half of the peak value of the modulus 3.5 basic fibre optic system (BFOS) the serial combination of a transmit terminal device, a fibre optic link, and a receive terminal device 3.6 bit-error ratio (BER) the number of errored bits divided by
35、the total number of bits, over some stipulated period of timeEN61281-1:1999 4 BSI 03-2000 3.7 branching device (BD) an optical device which has three or more optical ports NOTEBranching devices may be either passive (PBD) or active (ABD). 3.8 carrier-to-noise ratio (CNR) the ratio (expressed in dB)
36、of carrier power to noise power in a channel of defined bandwidth, prior to any non-linear processing 3.9 centre wavelength the mean of the closest spaced half-power wavelengths, one above and one below the peak wavelength of an optical spectrum NOTEOther spectral wavelengths are centroidal waveleng
37、ths, half-power wavelengths, and peak wavelengths. 3.10 centroidal wavelength the mean or average wavelength of an optical spectrum NOTEOther spectral wavelengths are centre wavelengths, half-power wavelengths, and peak wavelengths. 3.11 chirping a change of the wavelength or optical frequency of an
38、 intensity-modulated transmitter as a function of the instantaneous intensity of the modulating signal NOTEWhen chirped signals are transmitted through optical fibre, the signal waveform is distorted by chromatic dispersion. This process may cause a degradation in the quality of performance, designa
39、ted as a chirping penalty. 3.12 combiner, optical a wavelength-independent branching device in which the number of input ports exceeds the number of output ports 3.13 connector, fibre optic a fibre optic component providing optical interconnection/disconnection of fibre optic cable sections, optical
40、 devices, and terminal devices 3.14 (chromatic) dispersion the rate of change in group delay to wavelength (usually expressed in ps/nm) between the end points of the fibre optic cable plant 3.15 environmental conditions the range of temperatures, humidity, vibration levels, etc. within which the opt
41、ical device can be stored, or operated, or shipped and still meet all its specified parameter values 3.16 extinction ratio in a digital transmission system, the ratio (expressed in dB) of the average power level of logical “1” to the average power level of logical “0” 3.17 fibre optic cable plant (F
42、OCP) the serial combination of fibre optic cable sections, connectors, and splices providing the optical path between two terminal devices, between two optical devices, or between a terminal device and an optical deviceEN61281-1:1999 BSI 03-2000 5 3.18 fibre optic cable section a single (unjointed)
43、optical fibre cable 3.19 fibre optic communication system an assembly of fibre optic subsystems for transmitting information 3.20 fibre optic link (FOL) the serial combination of a fibre optic cable plant and optical devices, providing the optical path between a transmit terminal device and a receiv
44、e terminal device NOTEThis is equivalent to a basic fibre optic subsystem minus the transmitter and receiver. 3.21 fibre optic subsystem an assembly of interconnected basic fibre optic subsystems. The assembly is specified at defined interfaces within the fibre optic system 3.22 full-width at half-m
45、aximum (FWHM) the positive difference of the closest spaced half-power wavelengths, one above and one below the peak wavelength of an optical spectrum NOTE 1Other spectral widths are N-dB-down widths and root-mean-square widths. NOTE 2The FWHM equals the N-dB-down width where N =3. 3.23 half-power w
46、avelength a wavelength corresponding to a half peak power value of the optical spectrum NOTEOther spectral wavelengths are central wavelengths, centroidal wavelengths, and peak wavelengths. 3.24 harmonic distortion distortion in a system or transducer characterized by the presence at the output of s
47、pectral components which are harmonically related to the spectral components of the input signal 1 1) 3.25 input power range for an optical fibre amplifier, the range of optical power levels such that, for any input signal power of the OFA which lies within this range, the corresponding output signa
48、l power lies in the specified output power range, where the OFA performance is ensured 3.26 input signal bandwidth, analogue the bandwidth at the electrical input to the transmitter 3.27 intermodulation distortion (IMD) distortion characterized by the appearance of spectral components with frequenci
49、es equal to the sums and differences of integral multiples of two or more component frequencies of the input signal 1 3.28 intersymbol interference (ISI) the overlap of adjacent pulses as caused by the limited bandwidth characteristics of the optical devices in a fibre optic link 1) Figures in square brackets refer to the bibliography given in Annex B.EN61281-1:1999 6 BSI 03-2000 3.29 jitter random or data-induced short-term non-cumulative variations of the phases or of the significant instants of a digital signal fr
