Efficient wavelength referencing in a combined optical amplifier-optical channel monitor apparatus
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United States of America Patent
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Jun 10, 2008
Grant Date -
Sep 6, 2007
app pub date -
Mar 6, 2006
filing date -
Mar 6, 2006
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Abstract
Efficient wavelength calibration in a WDM optical amplifier that includes an optical channel monitor (OCM) is obtained by introducing a notch into the amplified spontaneous emission (ASE) noise spectrum of the amplifier outside a WDM transmission band, and having the OCM detect the notch and use the notch as a reference to calibrate the wavelength measurement. The notch is introduced into the ASE noise spectrum using a notch filter, which is preferably incorporated in a gain flattening filter (GFF).
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