Method and apparatus for stabilizing a high-gain, high-power single polarization EDFA
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United States of America Patent
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Dec 14, 2004
Grant Date -
Nov 14, 2002
app pub date -
Apr 27, 2001
filing date -
Apr 27, 2001
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Abstract
A high-gain, saturated output, double-pass, fault-tolerant optical amplifier has an extended range of stability, output power, and efficiency and fall back modes of operation. The optical amplifier is typically configured in a two-stage polarization maintaining configuration, employing erbium-doped fibers as the gain media in both of the stages. At least one optical element in a loss-insensitive region of the amplifier can have a loss substantially higher than optical elements in the gain paths outside of the loss-insensitive region without substantially reducing the overall output power and efficiency of the amplifier. These elements can influence the amplified signal waveform, spectrum, signal-to-noise ratio, or subsequent performance in an optical network, as well as amplifier characteristics, such as output power, stability, efficiency, and reliability. The optical amplifier is suitable for both free-space and fiber optic network applications.
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