Method and apparatus for combining add/drop optical signal lines from a plurality of branching units
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United States of America Patent
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Feb 17, 1998
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app pub date -
Oct 10, 1996
filing date -
Oct 10, 1996
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Abstract
An optical signal processing method and apparatus for providing a noise feedback loop that uses existing noise within the optical system to saturate a chain of amplifiers after the branching unit, thereby preventing information channels in a WDM signal containing empty channels from becoming overamplified as they pass through downstream amplifiers. The method and apparatus uses an existing drop amplifier which emits ASE noise as a side effect. A coupler connects the ASE noise to a filter. The filtered ASE noise is fed into an existing trunk amplifier by a second coupler. The trunk amplifier increases gain to the filtered ASE noise to a level high enough to saturate the amplifier chain, without requiring an external noise generating device.
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