ANSI TIA EIA-455-206-2000 FOTP-206 IEC 61290-1-1 Optical Fibre Amplifiers C Basic Specification Part 1-1 Test Methods for Gain Parameters C Optical Spectrum Analyzer (Please refer .pdf

1、 TIA/EIASTANDARDFOTP-206IEC 61290-1-1Optical Fibre Amplifiers BasicSpecification Part 1-1: Test Methods for Gain Parameters Optical Spectrum AnalyzerTIA/EIA-455-206OCTOBER 2000TELECOMMUNICATIONS INDUSTRY ASSOCIATIONRepresenting the telecommunications industry inassociation with the Electronic Indust

2、ries Alliance ANSI/TIA/EIA-455-206-2000Approved: September 26, 2000TIA/EIA-455-206NOTICETIA/EIA Engineering Standards and Publications are designed to serve the public interest througheliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability andimprovement o

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8、Spectrum Analyzer Standard shouldbe submitted to TIA.(From Standards Proposal No. 4496, formulated under the cognizance of the TIA FO-2.1 Subcommittee onSingle Mode Systems.)Published byTELECOMMUNICATIONS INDUSTRY ASSOCIATION 2000Standards and Technology Department2500 Wilson BoulevardArlington, VA

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11、nada 1-800-854-7179, International (303) 397-795661290-1-1 IEC:1998 TIA/EIA-455-206iCONTENTSPageFOREWORD iiiINTRODUCTION . ivClause1 Scope and object 12 Normative reference. 13 Apparatus 24 Test sample . 35 Procedure 46 Calculation 57 Test results . 7Figure 1 Typical arrangement of the optical spect

12、rum analyzer test apparatus forsmall-signal gain measurements . 2Figure 2 Typical behaviour of the gain as a function of the input signal power . 6Annex A (informative) List of abbreviations . 9Annex B (informative) Bibliography . 1061290-1-1 IEC:1998 TIA/EIA-455-206ii61290-1-1 IEC:1998 TIA/EIA-455-

13、206iiiINTERNATIONAL ELECTROTECHNICAL COMMISSIONTIA/EIA-455-206 FOTP206OPTICAL FIBRE AMPLIFIERS BASIC SPECIFICATION Part 1-1: Test methods for gain parameters Optical spectrum analyzerFOREWORD1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardizationcompris

14、ing all national electrotechnical committees (IEC National Committees). The object of the IEC is topromote international co-operation on all questions concerning standardization in the electrical andelectronic fields. To this end and in addition to other activities, the IEC publishes International S

15、tandards.Their preparation is entrusted to technical committees; any IEC National Committee interested in thesubject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC

16、 collaboratesclosely with the International Organization for Standardization (ISO) in accordance with conditionsdetermined by agreement between the two organizations.2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opi

17、nion on the relevant subjects since each technical committee hasrepresentation from all interested National Committees.3) The documents produced have the form of recommendations for international use and are published inthe form of standards, technical reports or guides and they are accepted by the

18、National Committees inthat sense.4) In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding

19、 national or regional standard shall beclearly indicated in the latter.5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible forany equipment declared to be in conformity with one of its standards.6) Attention is drawn to the possibility that some of th

20、e elements of this International Standard may be thesubject of patent rights. The IEC shall not be held responsible for identifying any or all such patentrights.International Standard IEC 61290-1-1 has been prepared by subcommittee 86C: Fibre opticsystems and active devices, of IEC technical committ

21、ee 86: Fibre optics.It shall be read in conjunction with IEC 61291-1.The text of this standard is based on the following documents:FDIS Report on voting86C/173/FDIS 86C/197/RVD61290-1-1 IEC:1998 TIA/EIA-455-206ivFull information on the voting for the approval of this standard can be found in the rep

22、ort onvoting indicated in the above table.Annexes A and B are for information only.61290-1-1 IEC:1998 TIA/EIA-455-206vINTRODUCTIONAs far as can be determined, this is the first International Standard on optical fibreamplifiers. The technology of optical fibre amplifiers is quite new and still emergi

23、ng, henceamendments 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 isgiven in the annex A.61290-1-1 IEC:1998 TIA/EIA-45

24、5-2061TIA/EIA-455-208 FOTP208OPTICAL FIBRE AMPLIFIERS BASIC SPECIFICATION Part 1-1: Test methods for gain parameters Optical spectrum analyzer1 Scope and objectThis part of IEC 61290 applies to optical fibre amplifiers (OFAs) using active fibres,containing rare-earth dopants, presently commercially

25、available.The object of this standard is to establish uniform requirements for accurate and reliablemeasurements, by means of the optical spectrum analyzer test method, of the following OFAparameters, as defined in clause 3 of IEC 61291-1:a) small-signal gain;b) reverse small-signal gain;c) maximum

26、small-signal gain;d) maximum small-signal gain wavelength;e) maximum small-signal gain variation with temperature;f) small-signal gain wavelength band;g) small-signal gain wavelength variation;h) small-signal gain stability;i) polarization-dependent gain variation.NOTE All numerical values followed

27、by () are currently under consideration.2 Normative referenceThe following normative document contains provisions which, through reference in this text,constitute provisions of this part of IEC 61290. At the time of publication, the editionindicated was valid. All normative documents are subject to

28、revision, and parties toagreements based on this part of IEC 61290 are encouraged to investigate the possibility ofapplying the most recent edition of the normative document indicated below. Members of IECand ISO maintain registers of currently valid International Standards.IEC 61291-1, Optical fibr

29、e amplifiers Part 1: Generic specification 1)1) To be published.61290-1-1 IEC:1998 TIA/EIA-455-20623 ApparatusA scheme of the measurement set-up is given in figure 1.OpticalpowermeterVariableopticalattenuatordBOpticalsourceJ1 Polarizationcontroller(optional)Figure 1a CalibrationFigure 1b Input signa

30、l power measurementFigure 1c Output power measurementOpticalspectrumanalyzerVariableopticalattenuatordBOpticalsourceJ1 J2Polarizationcontroller(optional)OFAunder testOpticalspectrumanalyzerVariableopticalattenuatordBOpticalsourceJ1OFAJ2Polarizationcontroller(optional)IEC 670/98IEC 669/98IEC 668/98Fi

31、gure 1 Typical arrangement of the optical spectrum analyzer test apparatusfor small-signal gain measurementsThe test equipment listed below, with the required characteristics, is needed.a) optical source: the optical source shall be either at fixed wavelength or wavelength-tunable: fixed-wavelength

32、optical source: this optical source shall generate a light with awavelength and optical power specified in the relevant detail specification. Unlessotherwise specified, the optical source shall emit a continuous wave with the full widthat half maximum of the spectrum narrower than 1 nm (). A distrib

33、uted feed-back(DFB) laser, a distributed Bragg reflector (DBR) laser, an external cavity laser (ECL)diode and a light emitting diode (LED) with a narrow-band filter are applicable, forexample. The suppression ratio for the side modes for the DFB laser, the DBR laser orthe ECL shall be higher than 30

34、 dB (). The output power fluctuation shall be lessthan 0,05 dB (), which may be better attainable with an optical isolator at the outputport of the optical source. Spectral broadening at the foot of the lasing spectrum shallbe minimal for laser sources;61290-1-1 IEC:1998 TIA/EIA-455-2063 wavelength-

35、tunable optical source: this optical source shall be able to generate awavelength-tunable light within the range specified in the relevant detail specification.Its optical power shall be specified in the relevant detail specification. Unlessotherwise specified, the optical source shall emit a contin

36、uous wave with the full widthat half maximum of the spectrum narrower than 1 nm (). An ECL or an LED with anarrow bandpass optical filter is applicable for example. The suppression ratio of sidemodes for the ECL shall be higher than 30 dB (). The output power fluctuation shallbe less than 0,05 dB, w

37、hich may be better attainable with an optical isolator at theoutput port of the optical source. Spectral broadening at the foot of the lasingspectrum shall be minimal for the ECL;NOTE The use of an LED should be limited to small-signal gain measurements.b) optical power meter: it shall have a measur

38、ement accuracy better than 0,2 dB,irrespective of the state of polarization, within the operational wavelength bandwidth ofthe OFA. A dynamic range exceeding the measured gain is required (e.g. 40 dB);c) optical spectrum analyzer: the linearity and accuracy of spectral-power-measurementshall be bett

39、er than 1,5 dB and 1 dB respectively, within the operational wavelengthbandwidth of the OFA. Polarization dependence of the spectral power measurement shallbe better than 0,5 dB. The wavelength measurement accuracy shall be better than 0,5nm. A dynamic range exceeding the measured gain is required (

40、e.g. 40 dB). The spectralresolution shall be equal or better than 0,1 nm;d) optical isolator: optical isolators may be used to bracket the OFA. The polarization-dependent lossvariation of the isolator shall be better than 0,2 dB (). Optical isolation shall be betterthan 40 dB (). The reflectance fro

41、m this device shall be smaller than 40 dB () at eachport;e) variable optical attenuator: the attenuation range and stability shall be over 40 dB () andbetter than 0,1 dB (), respectively. The reflectance from this device shall be smallerthan 40 dB () at each port;f) polarization controller: this dev

42、ice shall be able to provide as input signal light allpossible states of polarization (e.g. linear, elliptical and circular). For example, thepolarization controller may consist of a linear polarizer followed by an all-fibre-typepolarization controller, or by a linear polarizer followed by a quarter

43、-wave plate rotatableby minimumof 90, and a half wave plate rotatable by minimum of 180. The loss variation of thepolarization controller shall be less than 0,2 dB (). The reflectance from this device shallbe smaller than 40 dB () at each port;g) optical fibre jumpers: the mode field diameter of the

44、 optical fibre jumpers used should beas close as possible to that of fibres used as input and output ports of the OFA. Thereflectance from this device shall be smaller than 40 dB () at each port, and the lengthof the jumper shall be shorter than 2 m;h) optical connectors: the connection loss repeata

45、bility shall be better than 0,2 dB.4 Test sampleThe OFA shall operate at nominal operating conditions. If the OFA is likely to cause laseroscillations due to unwanted reflections, optical isolators should be used to bracket the OFAunder test. This will minimize the signal instability and the measure

46、ment inaccuracy.For measurements of parameters a) to h) of clause 1, care shall be taken in maintaining thestate of polarization of the input light during the measurement. Changes in the polarization61290-1-1 IEC:1998 TIA/EIA-455-2064state of the input light may result in input optical power changes

47、 because of the slightpolarization dependency expected from all the optical components used, this leading tomeasurement errors.5 Procedurea) Small-signal gain: this method permits determination of the small-signal gain through themeasurements of the OFA input signal power, Pin, the OFA output power,

48、 Pout, and theOFA Amplified Spontaneous Emission (ASE) power, PASE at the signal wavelength. Themeasurement procedures described below shall be followed:1) set the optical source at the test wavelength specified in the relevant detailspecification. Set the optical source and the variable optical att

49、enuator in a way toprovide, at the input port of the OFA, the optical power Pin specified in the relevantdetail specification;2) measure Pin with the optical power meter, as shown in figure 1a, to calibrate theoptical spectrum analyzer;3) measure Pin with the optical spectrum analyzer, as shown in figure 1b;4) measure Pout with the optical spectrum analyzer, as