CUT-OFF WAVELENGTH MEASUREMENTS FOR SINGLE-MODE OPTICAL FIBERS

被引:45
作者
MURAKAMI, Y
KAWANA, A
TSUCHIYA, H
机构
[1] Nippon Telegraph and Telephone Public Corporation, Electrical Communication Laboratories, Musashino-shi, Tokyo
来源
APPLIED OPTICS | 1979年 / 18卷 / 07期
关键词
D O I
10.1364/AO.18.001101
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A new technique has been proposed for direct measurement of the cut-off wavelength, at which the first higher-order mode disappears.It uses a change of a near-field pattern of a fiber, which is excited by a variable wavelength source.The cut-off wavelength can be measured with ±5-nm accuracy.The most suitable fiber length for precise measurement is 10–20 mm.It is found, furthermore, that the first higher-order mode under the condition near cut-off rapidly attenuates because of waveguide imperfections, in which the loss due to core-cladding boundary distortions is the most dominant.© 1979 Optical Society of America.
引用
收藏
页码:1101 / 1105
页数:5
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