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Optics Letters

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  • Vol. 21, Iss. 19 — Oct. 1, 1996
  • pp: 1553–1555

Intermodal beat lengths in birefringent two-mode fibers

Dan Östling, Bjørnar Langli, and Helge E. Engan  »View Author Affiliations


Optics Letters, Vol. 21, Issue 19, pp. 1553-1555 (1996)
http://dx.doi.org/10.1364/OL.21.001553


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Abstract

We use an accousto-opitc method to measure the beat lengths between the LP01 and the LP11 modes propagating both in an elliptical-core polarization-maintaining fiber and in a bow-tie high-birefringence (Hi-Bi) fiber for a wide range of optical wavelengths. The Hi-Bi fiber exhibits considerable polarization splitting in the measured beat lengths at all measured wavelengths. According to theory for circular-core fibers, the beat length should have a minimum at the wavelength at which the two modes have the same group velocity in the fiber. We find that for the elliptical-core fiber such a minimum does not exist in the two-mode region. Based on our measurements we discuss the use of different fiber types in various two-mode devices.

© 1996 Optical Society of America

History
Original Manuscript: April 16, 1996
Published: October 1, 1996

Citation
Dan Östling, Bjørnar Langli, and Helge E. Engan, "Intermodal beat lengths in birefringent two-mode fibers," Opt. Lett. 21, 1553-1555 (1996)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-21-19-1553


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