| 主权项 |
1. A method of detecting changes in a digital optical signal, the method comprising:
repeatedly sampling the digital optical signal in a synchronous manner during a predetermined interval to generate a captured eye diagram; generating at least one of a positive differential eye diagram or a negative differential eye diagram from the captured eye diagram and a baseline eye diagram, wherein the captured eye diagram and the baseline eye diagram each comprise a plurality of pixels, each pixel having an associated value, the generating step including:
for each pixel in the baseline eye diagram, subtracting the value associated with the pixel in the baseline diagram from the value associated with a corresponding pixel in the captured eye diagram;wherein the positive eye diagram is generated from the pixels having positive difference values, and the negative eye diagram is generated from the pixels having negative difference values; and analyzing the at least one positive or negative differential eye diagram to determine whether a change in signal conditions is present, wherein the positive differential eye diagram shows regions to which the digital optical signal has spread since the baseline eye diagram was generated, and the negative differential eye diagram shows regions from which the digital optical signal has spread since the baseline eye diagram was generated. |
