IEC 61300-2-14:2021 pdf download

IEC 61300-2-14:2021 pdf download.Fibre optic interconnecting devices and passive components – Basic test and measurement procedures
1 Scope
This part of IEC 61300 describes a procedure for determining the suitability of a fibre optic interconnecting device or a passive component to withstand exposure to the optical power which occurs during its operation.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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 60825-1, Safety of laser products – Part 1: Equipment classification and requirements IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 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 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-3: Examinations and measurements – Active monitoring of changes in attenuation and return loss IEC 61300-3-35, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-35: Examinations and measurements – Visual inspection of fibre optic connectors and fibre-stub transceivers
4 Apparatus
4.1 Source (S) The source unit consists of an optical emitter, the means to connect to it and the associated drive electronics. A tunable light source (TLS) in which a specific output wavelength can be tuned may be chosen as the optical emitter. A TLS may consist of a tunable LD and an optical amplifier or a fibre ring laser. Generally, the power and stability requirements of the test will necessitate that the optical emitter has a fibre pigtail. It shall have a stable output power and wavelength/frequency over the measurement period. For DWDM devices, the frequency stability (instead of the wavelength stability) shall be less than half of the channel bandwidth. Unless otherwise stated in the relevant specification, the source shall have the following characteristics: a) centre wavelength stability: – nominal centre wavelength ±5 nm (for WWDM and CWDM devices); b) centre frequency stability: – nominal centre frequency ±6,3 GHz (for DWDM devices of 25 GHz channel bandwidth); – nominal centre frequency ±12,5 GHz (for DWDM devices of 50 GHz channel bandwidth); – nominal centre frequency ±25 GHz (for DWDM devices of 100 GHz channel bandwidth); c) output power stability: – nominal output power ±0,05 dB.4.2 Optical detector (D) The optical detector unit consists of an optical detector, the means to connect to it and the associated electronics. The detector shall have sufficient dynamic range to make the necessary measurements and shall be linear over the measurement range. The detector shall be stable over the measurement period and shall have an operational wavelength range consistent with the DUT. The connection to the detector shall be an adaptor that accepts a connector plug of the appropriate design. The detector shall be capable of capturing all light emitted by the connector plug. Unless otherwise stated in the relevant specification, the detector shall have the following characteristics:4.3 Environmental chamber The test set-up shall include an environmental chamber capable of producing and maintaining the specified temperature and/or humidity. 4.4 Data acquisition system (DAS) Recording the optical power readings of the optical detector may be done either manually or automatically. An appropriate DAS shall be used where measurements are performed automatically. 4.5 Branching device (BD) The splitting ratio of the branching device shall be stable over the optical powers and wavelengths chosen for the test. It shall also be insensitive to polarization. A splitting ratio of 1:99 is recommended for the branching device in order to input high power to the DUT and low power to the optical detector. 4.6 Temporary joints (TJ) These are typically used in connecting the device under test to the test apparatus. For the test requirements of optical power and stability, the temporary joints shall be fusion splices. 4.7 Safety devices All necessary safety devices, including laser safety glasses, signs and other safety materials, shall be provided in order to protect individuals from possible hazards during testing. 4.8 Test set-up For two-port optical components, a typical layout for the test apparatus is shown in Figure 1. This test procedure involves the use of optical powers which constitute a potential ocular and skin hazard to test personnel. All necessary safety procedures shall be adopted in accordance with IEC 60825-1. In particular, the DUT shall be unpowered (that is, with no power propagating in the fibre) when conducting a visual examination.