Optical-fiber amplifier having high-saturation output
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United States of America Patent
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Mar 2, 1999
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app pub date -
Oct 30, 1996
filing date -
Oct 30, 1996
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Abstract
The present invention features a light-pumped, single-mode, pulse- or continuous-wave amplifier, or a Q-switch, with each having a high-saturation output power. The amplifier or Q-switch has a light-pumped, optical fiber having active ions that are either annularly located within the cladding or adjacent the core/cladding interface. Pump-light and an input signal are coupled to the fiber via a dispersive or biconically-tapered coupler. The light-pumped fiber provides stored energy, with an induced emission in the excited-state population that is relatively low for the given amount of energy stored. The central part of the core both stores and propagates whatever light is present, due to induced emission, which takes place only in the annular region. The light that is incident on the fiber is of sufficient intensity so that, despite the low rate of induced emission per unit of light intensity, a significant power increase occurs.
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