IN-BAND OPTICAL SIGNAL TO NOISE RATIO MONITORING TECHNIQUE
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United States of America Patent
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Issued Date -
Aug 30, 2012
app pub date -
Feb 17, 2012
filing date -
Feb 28, 2011
priority date (Note) -
Abandoned
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Abstract
A monitor for monitoring OSNR of data being carried via an optical network link, the monitor obtains an optical signal from the link, comprises a loop of a non-linear optical medium capable of producing a back reflected signal to the optical signal and of looping the back reflected signal; and comprises a device for extracting a portion of the looped back reflected signal from said loop. The monitor further comprises a first photodetector for measuring power of the optical signal and a second photodetector for measuring power of the extracted portion of the looped signal. Finally, there is a processing unit for determining OSNR of the optical signal based at least on readings of the first and the second photodetectors.
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