Intermodal beat lengths in birefringent two-mode fibers.
Intermodal beat lengths in birefringent two-mode fibers.
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DOI：
10.1364/ol.21.001553
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发表时间：
1996-10
期刊：
影响因子：
3.6
通讯作者：
Dan Östling;Bjørnar Langli;Helge E. Engan
中科院分区：
文献类型：
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作者：
Dan Östling;Bjørnar Langli;Helge E. Engan
We use an accousto-opitc method to measure the beat lengths between the LP(01) and the LP(11) 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.
