Low-noise distributed Raman amplifier using bi-directional pumping using multiple Raman orders
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United States of America Patent
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Mar 30, 2004
Grant Date -
Jul 17, 2003
app pub date -
Jan 2, 2003
filing date -
Jan 12, 2000
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Abstract
A Raman amplifier assembly includes a Raman amplifier configured to receive a signal from a signal source. The signal travels in an upstream direction in the Raman amplifier. A first pump source is coupled to the Raman amplifier. The first pump source produces a first pump beam that travels in a downstream direction and is counter-propagating relative to the signal. A second pump source is coupled to the Raman amplifier and produces a second pump beam that travels in the upstream direction. The second pump source has an average relative intensity noise of less than -80 dB/Hz.
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