凹凸はめ合い式低反射型光部品の研究 (第1報)

基本構想と凸成形装置

抄録

This paper proposes a low cost fabrication method using concavo-convex micro connection for high quality optical devices, and also describes the newly designed convex forming equipment for obtaining this micro connection. The distinctive feature of this micro connection is to use optical fibers which are formed convex cone shape on the ends of them by newly designed etching equipment, and to use optical lenses which are formed concave cone shape on the ends of them by also newly designed precise micro heating press machine. First of all, the experiments are performed for forming convex cone shapes on the ends of optical fibers which are optical elements of optical collimators, optical splitters and so forth. For an example, the convex cone shape whose top angle α is approximately 1.8 rad and the height H is approximately 4.7 μm is formed on the end of step index type single mode optical fiber. Then, the value of back reflection BR of its optical fiber is also obtained -60 dB compared with -28 dB on flat finished end fiber under using a wavelength λ=1.3 μm.