折射率差，又叫双折射率，是指两种中级晶族或低级晶族的晶质物质的不同方向的折射率的差值 并不是两种物质。
计算发现，水气项中的频率改正对折射率差的贡献是不可忽略的。
Via calculation we find the contribution of the frequency in the vapor term to the refractivity can not be neglected.
介质折射率差的绝对值越大、周期数增加都使透射波谱宽度变窄。
With the increase of the periods and the absolute value of refractive index difference, the full width at half maximum of spectrum decreases.
文中还验证了单模光纤的模场直径、截止波长、相对折射率差对OTDR曲线的影响。
In this article, the influences of the mode field diameter, the cutoff wavelength and the relative refractive index difference on the OTDR curve are also verified.
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