Multi-stage optical amplifier and broadband communication system
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United States of America Patent
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Jan 1, 2002
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app pub date -
Dec 23, 1999
filing date -
Dec 23, 1999
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Abstract
A multi-stage optical amplifier that has an optical fiber with a first length of amplifier fiber and a second length of amplifier fiber. The optical fiber is configured to be coupled to a signal source that produces at least a signal wavelength .lambda..sub.s and a pump source that produces a pump wavelength .lambda..sub.p. Pump wavelength .lambda..sub.p is less than signal wavelength .lambda..sub.s. Signal input, signal output and pump input ports are each coupled to the optical fiber. A first lossy member is coupled to the optical fiber and positioned between the first and second lengths of amplifier fiber. A pump shunt is coupled to the signal input port and the signal output port.
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