The use of a glass-plate probe of rectangular shape is proposed for the measurement of transmission loss in optical waveguides. The light-collecting window is of a thin, rectangular shape and is perpendicular to the light streak, while the conventional fiberglass probe has a small circular face. This transversely elongated form results in a great improvement of mechanical tolerance for the probe movement in the vertical as well as in the transverse direction. A theoretical investigation also presents a reasonable agreement with the experiments.
© 1992 Optical Society of America
Ikuo Awai, Hidetoshi Onodera, Young-kyu Choi, Masamitsu Nakajima, and Jun-ichi Ikenoue, "Improved method of loss measurement for optical waveguides by use of a rectangular glass probe," Appl. Opt. 31, 2078-2084 (1992)