Multi-stage optical amplifier and broadband communication system
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United States of America Patent
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Apr 26, 2005
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N/A
app pub date -
Dec 10, 2001
filing date -
Jun 16, 1998
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Abstract
A multi-stage optical amplifier includes at least a distributed Raman amplifier fiber and a discrete amplifier fiber. The amplifier is configured to be coupled to at least one signal source that produces a plurality of signal wavelengths .lambda..sub.s ; and at least a first pump source that produces one or more pump beam wavelengths .lambda..sub.p. A signal input port is coupled to the amplifier. A signal output port is coupled to the amplifier. The distributed Raman and discrete amplifier fibers are positioned between the signal input port and the signal output port. A first pump input port is coupled to a first end of the distributed Raman amplifier fiber. A second pump input port is coupled to a second end of the distributed Raman amplifier fiber. The first end is located closer to the signal input port than the second end. A third pump input port is coupled to the discrete amplifier fiber.
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