Optical FDM光频分复用opticaladj.视觉的；光学的optical micrometer光测微计,光学测微器,光学测微计optical difference光差分optical test wedge光学检验劈optical camouflage光学伪装optical fiber loop光纤环路Optical fiber unit光单元optical fibre gyro光纤陀螺optical correlator光相关器optical anisotropy光学各向异性optical insulation光学绝缘