BS EN IEC 61753-091-02:2022
光纤互连装置和无源元件 性能标准 用于 C 类受控环境的非连接器 3 端口不完全循环单模光纤循环器
Fibre optic interconnecting devices and passive components. Performance standard - Non-connectorized 3-port incompletely circulated single-mode fibre optic circulators for category C. Controlled environments