Method and apparatus for operating variable optical attenuator by modulating the attenuation thereof
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United States of America Patent
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Jul 4, 2006
Grant Date -
Jan 27, 2005
app pub date -
Jul 15, 2003
filing date -
Jan 22, 2003
priority date (Note) -
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Abstract
A method and apparatus are disclosed for operating an eVOA by modulating its attenuation. If an optical signal power is below a loss of signal (LOS) power threshold the eVOA attenuation is set to a maximum attenuation and then, periodically and quickly decreased and increased in steps while checking for the presence of optical signals above the LOS power threshold. The method is also used for operating a multiplicity of eVOAs while minimizing the risk of damage to optical network equipment.
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