利用光线理论研究光纤弯曲损耗与弯曲半径、纤芯折射中以及包层折射率的关系。
By the theory of ray optics, the bend losses of fiber as function of fiber parameters such as core index, cladding index, core radius and bend radius are set up.
在本论文中，首先根据光纤的弯曲损耗原理监测岩层的变形。
In this paper, with bending loss of optical fiber, deformation of rock layer can be monitored.
从理论上讲，弯曲和形变都会增大光纤的传输损耗。
Theoretically bend and deformation increase transmission losses in the fiber.
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