Abstract
In this paper, a novel inspection technique for the cascaded fiber fabrication is proposed to improve the
coupling performance of such fibers. Instead of using a direct-monitoring method, an indirect technique with the
help of the ray tracing and the lens–fiber interference is used. By calculating the optical-path length of the
light rays passing through the fiber, the interference fringes and light intensity can be counted. Then, the
splicing plane of the cascaded fiber can be determined by observing the difference between the two fiber sections.
Simulations and experiments have been performed to find the splicing plane. Finally, the accuracy of fabrication can
be improved from 10 to about 1 µm; thus, the coupling
loss due to the fabrication process can be reduced.
© 2007 IEEE
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