RARE-EARTH DOPED FIBER, OPTICAL AMPLIFIER, AND METHOD FOR CONTROLLING OPTICAL AMPLIFIER
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United States of America
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Issued Date -
Apr 10, 2025
app pub date -
Feb 3, 2022
filing date -
Feb 3, 2022
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Abstract
An optical amplifier of the present disclosure includes a rare-earth doped fiber including a plurality of cores, in which a v value of the plurality of cores of the rare-earth doped fiber is less than 2.405, the plurality of cores has a core pitch of a normalized coupling coefficient of 1.0×10−3 or more, and on injection of excitation light into a clad part of the rare-earth doped fiber in a state of being bent at a predetermined bending radius, propagating light in the rare-earth doped fiber is amplified with mode-dependent gain characteristics dependent on the bending radius.
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