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Applied Optics

Applied Optics


  • Vol. 18, Iss. 7 — Apr. 1, 1979
  • pp: 1101–1105

Cut-off wavelength measurements for single-mode optical fibers

Yasuji Murakami, Akio Kawana, and Haruhiko Tsuchiya  »View Author Affiliations

Applied Optics, Vol. 18, Issue 7, pp. 1101-1105 (1979)

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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

Original Manuscript: August 29, 1978
Published: April 1, 1979

Yasuji Murakami, Akio Kawana, and Haruhiko Tsuchiya, "Cut-off wavelength measurements for single-mode optical fibers," Appl. Opt. 18, 1101-1105 (1979)

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