保偏單模耦合器 ppsm polarization preserving single mode: 保偏單模光纖polarization-preserving coupler: 保偏耦合器single polarization coupler: 單偏振耦合器single mode coupler: 單模耦合器single polarization single-mode fiber: 單偏振單模光纖下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯