PD IEC/TR 62627 is a series on fibre optic interconnecting devices and passive components. Fibre optic interconnecting devices and passive components do not require electrical-to-optical or optical-to-electrical conversion during their operation. PD IEC/TR 62627-03-02 describes test data relating to high power damage of fixed optical attenuators, optical isolators, and optical splitters (non-wavelength selective branching devices). PD IEC/TR 62627-03-02 also describes the test of thermal simulation and failure mechanism analysis for the above passive optical components on high power transmission.
PD IEC/TR 62627-03-02 on fibre optic interconnecting devices and passive components is useful for:
Optical transmission power has increased in recent years due to the growing demands for ultra-long-haul transmission systems and more applications of fibre optic amplifiers for cable television broadcasting systems. In view of these advances, concerns arise about optical fibres, fibre optic connectors and passive optical components installed in fibre optic communication systems due to the fact that these components may harm human beings due to a leakage of high-power light and the possibility of fire caused by melting and damage of these components. However, mechanisms, conditions, and factors that cause such accidents have not yet been clearly identified. Furthermore, industry standards on the reliability and long-term evaluation of optical components do not include testing with high optical power. PD IEC/TR 62627-03-02 is based on the Optoelectronic Industry and Technology Development Association (OITDA) – Technical Paper (TP), TP04/SP_PD-2008, "Technical paper of investigation of high-power reliability for passive optical components for optical communication application".
PD IEC/TR 62627-03-02 defines the internal structure of a fixed optical attenuator, the metal-doped fibre (MDF) with a certain absorption coefficient is fixed in a ferrule using adhesive. Input and output fibre end faces are PC (physical contact) polished. The required attenuation is obtained by adjusting the absorption coefficient and the length of MDF. PD IEC/TR 62627-03-02 shows the thermal simulation result of an optical isolator. When light with an input power of 5W was used, the maximum temperature was approximately 120 °C, and the outer surface temperature was approximately 110 °C. As no material with a high light absorption rate was placed on the optical path of the optical isolator, the temperature was lower than that in the fixed optical attenuator. PD IEC/TR 62627-03-02 also shows the thermal simulation result of an optical splitter. The simulation conditions use an IL of 1 dB. With a light input power of 5 W, the maximum temperature was 150 °C, which is higher than that of the actual data shown in PD IEC/TR 62627-03-02. The reason for the difference is considered to be caused by the effect of heat conduction from the outer case to the air. Using PD IEC/TR 62627-03-02 you can describe test data relating to high power damage of fixed optical attenuators, optical isolators, and optical splitters.
IEC TR 62627-03-02:2011