Abstract
Tapered fibers with a diameter of sub-micrometer to several micrometer show various optical characteristics, and the diameter is the most important parameter. To guarantee their functions, it is necessary to measure the fiber diameter with high precision during manufacturing. In this research, we propose an in-process measurement method of the diameter of sub-micro-optical fiber. The proposed technique is based on analyzing optically scattered light generated by standing wave illumination. First, we show the scattering characteristics of sub-microfibers using numerical simulation based on finite element method (FEM). From the result of simulation, it was revealed that the optical fiber of 100 nm in diameter can be evaluated with the standing wave illumination.
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