单模光纤MFD测试条件的探讨

The Test Condition for MFD of SM Optical Fiber

对于截止波长大于工作波长的单模光纤,在测量光纤模场直径(MFD)时应考虑在测试波长下光纤是否处于单模传输。应采取诸如光纤弯曲的方法,使其在测试波长下满足单模传输条件,保证MFD的测试结果符合标准定义。建议国内外标准在MFD的测试方法中针对这样的光纤应有相关的阐述和明确规定测试条件。

Single-mode transmission should be ensured when measuring MFD of the single-mode optical fiber with cut-off wavelength larger than operating wavelength.The condition of single-mode transmission is satisfied by the method such as bending fiber in order to make the measurement result in accordance with the definition in standard.The test methods in related domestic and foreign standards should specify the test condition for these fibers.