IEC 61300-3-45:2011 pdf – Fibre optic interconnecting devices and passive components -Basic test andmeasurement procedures – Part 3-45: Examinations and measurements – Attenuation of random matedmulti-fibre connectors.
The purpose of this part of IEC 61300 Is to describe the procedure required to measure the statistical distribution and mean attenuation for random mated optical connectors with physical contact (PC) and angled physical contact (APC) polished 1-row multi-fibre rectangular ferrules as defined in the lC 61754 series. This measurement method is applicable to cable assemblies.
2 Normative references
The folowing 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 61300.1, Fibre optic interconnecung devices and passive componen:s — Basic test and measurement procedures — Pert 1: General and guidance
IEC 61300-3-1. Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-1: Examinations and measurements — Visual examination
IEC 61300-3-35, Fibre optic interconnecting devices and passive components — Basic test and measurement procedures — Part 3-35: Examinations and measurements — Fibre optic connector end!ace visual and automated inspection
IEC 61754 (all parts), Fibre optic connector interfaces
3 General description
3.1 Test methods
Two test methods are described for measuring the attenuation of random mated optical connectors. Both provide an estimate of the expected average performance that a group of cable assemblies (including an adaptor, if applicable) selected from a batch will exhibit when used In an optical system. The cable assemblies, and any adaptors, must be chosen at random to ensure that the measurements provide a statistically unbiased estimate.
Method 1 describes the procedure using a sample of cable assemblies and adaptors specified in Table 1 In this case the plugs (with pins) are used as reference plugs and the plugs (without pins) are tested against them sequentially. The results, based on the number of measurements specified in Table 1, are recorded in the test matrix shown in Figures 3 to 5.
Method 1 is intended to be part of a design approval exercise that may involve one or more suppliers. Once approval is achieved. Method 2 would be relied on to maintain process control. However, in the event of a dispute. Method 1 shall act as the reference measurement method.
d) To achieve consistent results, clean and inspect all connectors and adaptors prior to measurement, Visual examination shall be undertaken in accordance with IEC 61300.3-1 and IEC 613004-35.
NOTE A cladding mode stripper usually comprises a material having a refractive index equal Lo or greater than that o1 the fibre deeding.
4 Apparatus
4.1 Source (S)
The source consists of an optical emitter, the means to connect to it and associated drive electronics, In addition to meeting the stability and power level requirements, the source shall have the 101 lowing characteristics:
– Centre wavelength, as detailed in the performance and product standard:
— Spectral width, filtered light emitting diode (LED) 150 nm full width half maximum
— Spectral width, laser diode (LD) < 10 nm FWHM. For multimode fibres, broadband sources such as an LED shall be used. For single mode fibres either an LED or LO may be used. NOTE Th. f modis from a coherent source will create speckl, patterns in multimode fibres This. speckle patterns gIve rise to speckle or modM noise and are observed as power fluctuationS. since theW characteristic times are longer than the resolution time of the deteclor As a result. It may be Impossible to achieve stable launch conditions using coherent sources for mullimode measurements, Consequently lasers, including optical time domain reflectomeler (OTOR) sources, should be avo.ded In favour of LEDs or other incoherent sources for measurmg multimode components 4.2 Launch conditions (E) The launch condition shall be specified In accordance with IEC 81 300-1. 4.3 Detector (0) The detector consists of an optical detector, the means to connect to it and associated electronics. The connection to the detector will be an adaptor that accepts a connector plug of the appropriate design. The detector shall capture all light emitted by the connector plug. In addition to meeting the stability and resolution requirements, the detector shall have the following characteristics: — Linearity of multimode,  ±0.25 dB (over —5 dBm up to —80 dBm): — Linearity of single mode,  ±0,1 dB (over —5 dBm up to —60 dBm). NOTE Th, power meter ilnearty should be referenced to a power leval of .23 dBm at Lii, operational wavelength Where the connection to the detector is broken between the measurement of P1 and P2, the measurement repeatability shall be within 0.05 dB or 10 % of the attenuation to be measured, whichever is the lower value A large sensitive area detector may be used to achieve this. The precise characteristics of the detector shall be compatible with the measurement requirements. The dynamic range of the power meter shall be capable of measuring the power level exiting from the device under test (OUT) at the wavelength being measured.