APPARATUS AND METHOD FOR A SELF ADJUSTING RAMAN AMPLIFIER
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United States of America Patent
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Aug 13, 2002
Grant Date -
Aug 29, 2002
app pub date -
Feb 26, 2001
filing date -
Feb 26, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
This invention describes an apparatus and method for a self adjusting Raman amplifier for fiber optic transmission lines incorporating a line diagnostic mechanism in order to calculate, control and optimize the operating parameters for the amplifier. This need arises because the amplifier gain medium is the transmission line itself and the amplifier properties depend on the optical fiber properties along the first tens of kilometers of the transmission line from the pump. A Line Analyzing Unit, adjacent to the Raman pump unit, operates before the Raman pump is enabled and during operation, and characterizes the transmission line. The Line Analyzing Unit determines and characterizes the types of optical fibers installed along the transmission line and calculates and optimizes the pump or pumps power in order to achieve optimum gain and gain equalization. The Line Analyzing Unit may also determine if there is an optical loss or reflection in the optical fiber that can be destructive when the high power Raman pump is operating.
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