optical MDF光学手控测向仪opticaladj.视觉的；光学的optical powered sensor光动力传感器optical fiber combiner光纤合束器optical conductor loss光导体损耗optical tracker system光跟踪仪Optical Fibre net work光纤网络optical fiber splicing光纤接续optical alignment unit光学校准设备optical transit square光学经纬仪直角器optical fiber lighting光纤照明optical depolarization去偏振