Na measuring method of optical fiber

Abstract

Abstract PURPOSE:To measure the NA of optical fiber accurately and simply, by utilizing the temperature distribution of light, which is emitted from the output terminal of the optical fiber. CONSTITUTION:Light from a light source 1 is inputted to an optical fiber 3 through a lens 2 for light conversion. The light, which is outputted from an output terminal 4 of the optical fiber 3, is projected on a screen 5, and temperature distribution corresponding to the output pattern of the light is formed on the screen 5. A radiation radius R of the light is obtained from the temperature distribution. Based on the radiation radius R and a distance L from the output terminal 4 of the optical fiber to the screen 5, NA=R/(R<2>+L<2>)<1/2> is computed. Thus the NA of the optical fiber can be measured accurately and simply.

Inventors

• 👤 Yutaka Haratanaka
• 👤 原田中　裕
• 👤 Masanobu Shimizu
• 👤 正信 清水
• 👤 Sumio Kachi
• 👤 純夫 可知

Bibliographic Details