Optical fiber having enhanced separation of higher-order modes
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United States of America Patent
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Sep 19, 2006
Grant Date -
Feb 23, 2006
app pub date -
Aug 19, 2004
filing date -
Aug 19, 2004
priority date (Note) -
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Abstract
A new annular-core optical fiber is useful, inter alia, for stabilizing the behavior of an optical attenuator based on a Long Period Grating (LPG) against fluctuations in the polarization of the fundamental optical signal. The fiber dimensions and .DELTA.n are selected such that when a LPG of some period is used to couple fundamental-mode radiation in the fiber into higher-order modes, the wavelength of peak coupling into an HE mode is removed by at least 30 nm from the wavelength of peak coupling into the nearer of a TE mode or a TM mode.
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