1、This paper discusses the return loss in air-space type fixed optical attenuator.
本文討論了空氣隙型光固定衰減器的回波損耗。

2、Several kinds of measurement principles and methods for optical return loss are introduced.
介紹了幾種光回波損耗的測量原理和測量方法。

3、For the fault location and structural return loss measurement function.
供了故障定位和結構回波損耗(SRL)測量功能。

return loss翻譯