IEC 61315-2005 pdf – Calibration of fibre-optic power meters.
1 Scope This international standard is applicable to instruments measuring radiant power emitted from sources which are typical for the fibre-optic communications industry. These sources include laser diodes, light emitting diodes (LEDs) and fibre-type sources. The radiation may be divergent or collimated. The standard describes the calibration of power meters to be performed by calibration laboratories or by power meter manufacturers. 2 Normative references The following referenced documents 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. IEC 60050-300, International Electrotechnical Vocabulary – Electrical and electronic measurements and measuring instruments – Part 311: General terms relating to measurements – Part 312: General terms relating to electrical measurements – Part 313: Types of electrical measuring instruments – Part 314: Specific terms according to the type of instrument IEC 60359, Electrical and electronic measurement equipment – Expression of performance IEC 60793-2, Optical fibres – Part 2: Product specifications – General IEC 61300-3-12, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-12: Examinations and measurements – Polarization dependence of attenuation of a single-mode fibre optic component: Matrix calculation method IEC 61930, Fibre optic graphical symbology IEC 61931, Fibre optic – Terminology ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, and OIML:1993, International vocabulary of basic terms in metrology (VIM) BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, and OIML:1995, Guide to the expression of uncertainty in measurement (GUM)
3 Terms and definitions For the purposes of this International Standard, the definitions contained in IEC 61931 and the following definitions apply. 3.1 accredited calibration laboratory a calibration laboratory authorized by the appropriate national organization to issue calibration certificates with a minimum specified uncertainty, which demonstrate traceability to national standards 3.2 adjustment set of operations carried out on an instrument in order that it provides given indications corresponding to given values of the measurand [IEV 311-03-16; see also VIM 4.30] NOTE When the instrument is made to give a null indication corresponding to a null value of the measurand, the set of operations is called zero adjustment 3.3 calibration set of operations that establish, under specified conditions, the relationship between the values of quantities indicated by a measuring instrument and the corresponding values realized by standards [VIM, 6.11, modified] NOTE 1 The result of a calibration permits either the assignment of values of measurands to the indications or the determination of corrections with respect to indications. NOTE 2 A calibration may also determine other metrological properties such as the effect of influence quantities. NOTE 3 The result of a calibration may be recorded in a document, sometimes called a calibration certificate or a calibration report. 3.4 calibration conditions conditions of measurement in which the calibration is performed 3.5 centre wavelength λ centre the power-weighted mean wavelength of a light source in vacuum.
3.10 excitation (fibre) a description of the distribution of optical power between the modes in the fibre. In context with multimode fibres, the fibre excitation is described by: a) the spot diameter on the surface of the fibre end, and b) the numerical aperture of the radiation emitted from the fibre. Full excitation means radiation characterized by a spot diameter which is approximately equal to the fibre’s core diameter, and by a numerical aperture which is approximately equal to the fibre’s numerical aperture. Single mode fibres are generally assumed to be excited by only one mode (the fundamental mode) 3.11 instrument state set of parameters that can be chosen on an instrument NOTE Typical parameters of the instrument state are the optical power range, the wavelength setting, the display measurement unit and the output from which the measurement result is obtained (for example display, interface bus, analogue output).