A New Physical Contact Connection Method Using the Buckling Force of Optical Fiber

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Fiber physical contact (FPC) is proposed and demonstrated as a new method designed to enable fibers to be connected easily with a small structure while maintaining high optical performance. FPC is performed by mating two bare optical fibers in a micro sleeve and fixing them to a holder while they are buckled. Buckling is a phenomenon whereby a long column is bent by compression along its length. PC connection is realized by the buckling force of the fibers themselves and does not require any springs. Optical fiber buckling is studied both theoretically and experimentally. The bucking force, which is determined by an initial span between the optical fiber holding points, remains constant when the span is changed and is useful as the PC force. The buckling amplitude which is determined by the span reduction must be so small that it does not cause excess radiation loss. A suitable span is about 7mm. This generates a 0.7N. The allowed span reduction is 0.1mm. This results in a buckling amplitude of 0.64mm which prevents radiation losses of above 0.1dB for 1.31μm light. Based on a study of fiber buckling, we demonstrate the optical performance for FPC connection with a 0.126mm diameter micro sleeve in which optical fibers are mated and with polished fiber end faces. The insertion loss is under 0.3dB and the average return loss is 50dB for 1.31μm light. These values are stable in the -20 to 70℃ temperature range. We confirm that FPC connection realizes high optical performance with a small simple structure.
社団法人電子情報通信学会の論文
1997-02-25

A New Physical Contact Connection Method Using the Buckling Force of Optical Fiber

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