1、TIA/EIA STANDARD ANSI/TIA/EIA-455-2O9-2OOO Approved: September 26, 2000 FOTP-209 IEC 61290-2-1 Optical Fibre Amplifiers - Basic Specification Part 2-1: Test Methods for Optical Power Parameters - Optical Spectrum Analyzer TIMEIA-455-209 OCTOBER 2000 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representi
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8、1 : Test Methods for Optical Power Parameters - Optical Spectrum Analyzer Standard should be submitted to TIA. (From Standards Proposal No. 4499, formulated under the cognizance of the TIA FO-2.1 Subcommittee on Single Mode Systems.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2000 Standard
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10、rved Printed in U.S.A. 61290-2-1 O IEC:l998- TIA/EIA-455-209 CONTENTS Page . FOREWORD III INTRODUCTION IV . . Clause Scope and object 1 Normative references . 1 Apparatus. . 1 Test sample . 3 Procedure 4 Calculation 5 Test results . 5 Figure 1 - Typical arrangement of the optical spectrum analyzer t
11、est apparatus for nominal output and input signal power measurements 2 Annexes A (informative) List of abbreviations. . 7 Annexes B (informative) Bibliography 8 I 61290-2-1 O IEC:l998- TIA/EIA-455-209 II 61290-2-1 O IEC:l998- TIA/EIA-455-209 FDIS 86Cl178lFDIS INTERNATIONAL ELECTROTECHNICAL COMMISSIO
12、N Report on voting 86 Cl2 02lR V D TIA/EIA-455-209 - FOTP-209 OPTICAL FIBRE AMPLIFIERS - BASIC SPECIFICATION - Part 2-1 : Test methods for optical power parameters - Optical spectrum analyzer FOREWORD The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
13、 comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes Inter
14、national Standards. Their preparation is entrusted to technical committees; any I EC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this prepara
15、tion. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international co
16、nsensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. The documents produced have the form of recommendations for international use and are published in the form of standards, technical reports or guides and they are ac
17、cepted by the National Committees in that sense. In order to promote international unification, IEC National Committees undertake to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the I EC Standard and t
18、he corresponding national or regional standard shall be clearly indicated in the latter. The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. Attention is drawn to the possibility t
19、hat some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61 290-2-1 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IE
20、C technical committee 86: Fibre optics. It shall be read in conjunction with IEC 61291-1. The text of this standard is based on the following documents: Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. . III 61290-2-1
21、 O IEC:l998- TIA/EIA-455-209 Annexes A and B are for information only. IV 61290-2-1 O IEC:l998- TIA/EIA-455-209 I NTROD UCTI ON As far as can be determined, this is the first International Standard on optical fibre amplifiers. The technology of optical fibre amplifiers is quite new and still emergin
22、g, hence amendments and new editions to this standard can be expected. Each abbreviation introduced is explained in the text at least the first time it appears. However, for an easier understanding of the whole text, a list of all abbreviations used is given in annex A. V 61290-2-1 O IEC:l998- TIA/E
23、IA-455-209 TIA/EIA-455-209 - FOTP-209 OPTICAL FIBRE AMPLIFIERS - BASIC SPECIFICATION - Part 2-1 : Test methods for optical power parameters - Optical spectrum analyzer 1 Scope and object This part of IEC 61290 applies to optical fibre amplifiers (OFAs) using active fibres, containing rare-earth dopa
24、nts, presently commercially available. The object of this standard is to establish uniform requirements for accurate and reliable measurements, by means of the optical spectrum analyzer test method, of the following OFA parameters, as defined in clause 3 of IEC 61291-1: nominal output signal power;
25、large-signal output stability; saturation output power; maximum input signal power; maximum output signal power; input power range; output power range; maximum total output power. NOTE - All numerical values followed by ($) are currently under consideration. 2 Normative references The following norm
26、ative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 61290. 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 IEC 61290 are enc
27、ouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IEC 60793-1 -4:1995, Optical fibres - Part 1: Generic specification - Section 4: Measuring met
28、hods for transmission and optical characteristics IEC 61291-1: Optical fibre amplifiers - Part 1: Generic specification 1) 3 Apparatus A scheme of the measurement set-up for the nominal output signal power is given in figure 1. l) To be published. 1 61290-2-1 O IEC:l998- TIA/EIA-455-209 Optical IWJI
29、 source controller J2 47 spectrum analyzer +Il Polarization Variable optical attenuator Optical power 1 meter Figure la -Input signal power measurement Optical EC 70998 J2 4 Optical I Polarization spectrum controller analyzer source Variable optical OFA attenuator under test Optical power I meter I
30、EC 70a/98 Figure 1 b - Output signal power measurement Figure 1 - Typical arrangement of the optical spectrum analyzer test apparatus for nominal output and input signal power measurements The test equipment listed below, with the required characteristics, is needed: a) optical source: The optical s
31、ource shall be either at fixed wavelength or wavelength- tunable. - fixed-wavelength optical source: This optical source shall generate a light with a wavelength and optical power specified in the relevant detail specification. Unless otherwise specified, the optical source shall emit a continuous w
32、ave with the full width at half maximum of the spectrum narrower than 1 nm (4). A distributed feedback (DFB) laser, a distributed Bragg reflector (DBR) laser, an external cavity laser diode (ECL) and a light emitting diode (LED) with a narrow-band filter are applicable, for example. The suppression
33、ratio for the side modes for the DFB laser, the DBR laser or the ECL shall be higher than 30 dB (4). The output power fluctuation shall be less than 0,05 dB (*), which may be better attainable with an optical isolator at the output port of the optical source. Spectral broadening at the foot of the l
34、asing spectrum shall be minimal for laser sources; wavelength-tunable optical source: This optical source shall be able to generate a wavelength-tunable light within the range specified in the relevant detail specification. Its optical power shall be specified in the relevant detail apecification. U
35、nless otherwise specified, the optical source shall emit continuous wave with the full width at half maximum of the spectrum narrower than 1 nm (4). An ECL or an LED with a narrow bandpass optical filter is applicable for example. The suppression ratio of side modes for the ECL shall be higher than
36、30 dB (4). The output power fluctuation shall be less than 0,05 dB, which may be better attainable with an optical isolator at the output port of the optical source. - 2 61290-2-1 O IEC:l998- TIA/EIA-455-209 Spectral broadening at the foot of the lasing spectrum shall be minimal for the ECL; NOTE -
37、The use of an LED should be limited to small-signal measurements. optical power meter: It shall have a measurement accuracy better than f0,2 dB, irrespective of the state of polarization, within the operational wavelength bandwidth of the OFA. A dynamic range exceeding the measured gain is required
38、(e.g. 40 dB); optical spectrum analyzer: The linearity and accuracy of spectral-power-measurement shall be better than +1 ,5 dB and +1 dB respectively, within the operational wavelength bandwidth of the OFA. Polarization dependence of the spectral power measurement shall be better than +0,5 dB. The
39、wavelength measurement accuracy shall be better than +0,5 nm. A dynamic range exceeding the measured gain is required (e.g. 40 dB). The spectral resolution shall be equal or better than 0,l nm; optical isolator: Optical isolators may be used to bracket the OFA. The polarization-dependent loss variat
40、ion of the isolator shall be better than 0,2 dB (4). Optical isolation shall be better than 40 dB (4). The reflectance from this device shall be smaller than -40 dB (4) at each port; variable optical attenuator: The attenuation range and stability shall be over 40 dB (4) and better than +0,1 dB (*),
41、 respectively. The reflectance from this device shall be smaller than -40 dB (4) at each port; polarization controller: This device shall be able to provide as input signal light all possible states of polarization (e.g.: linear, elliptical and circular). For example, the polarization controller may
42、 consist of a linear polarizer followed by an all-fibre-type polarization controller,aor by a linear polarizer followed by a quarter-wave plate rotatable by minimum of 90“ and a half wave plate rotatable by a minimum of 180“. The loss variation of the polarization controller shall be less than 0,2 d
43、B (4). The reflectance from this device shall be smaller than -40 dB (4) at each port; optical fibre jumpers: The mode field diameter of the optical fibre jumpers used should be as close as possible to that of fibres used as input and output ports of the OFA. The reflectance from this device shall b
44、e smaller than -40 dB (4) at each port, and the length of the jumper shall be shorter than 2 m; optical connectors: The connection loss repeatability shall be better than +0,2 dB; optical coupler: The polarization dependence of the branching ratio of the coupler shall be minimal. Change of the state
45、 of polarization of the input light shall be negligible. Any free port of the coupler shall be properly terminated, in such a way as to decrease the reflectance below -40 dB (4). Test sample The OFA shall operate at nominal operating conditions. If the OFA is likely to cause laser oscillations due t
46、o unwanted reflections, optical isolators should be used to bracket the OFA under test. This will minimize the signal instability and the measurement inaccu racy. Care shall be taken in maintaining the state of polarization of the input light during the measurement. Changes in the polarization state
47、 of the input light may result in input optical power changes because of the slight polarization dependency expected from all the optical components used, this leading to measurement errors. 3 61290-2-1 O IEC:l998- TIA/EIA-455-209 5 Procedure a) Nominal output signal power: The nominal output signal
48、 power is given by the minimum output signal optical power, for an input signal optical power specified in the relevant detail specifications, and under nominal operating conditions, given in the relevant detail specification. To find this minimum value, input and output signal power levels shall be
49、 continuously monitored for a given duration of time and in presence of changes in the state of polarization and other instabilities, as specified in the relevant detail specification. The measurement procedures described below shall be followed, with reference to figure 1: 1) Measure the branching ratio of the optical coupler through the signal power levels exiting the two output ports with an optical power meter. 2) Measure the loss, Li, of the optical fibre jumper between the OFA and the optical spectrum analyzer (see figure lb) by the insertion loss technique (see Method IEC 793-1- C1 B,
