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Damian Marek
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Answer:

In OptiSystem a signal is generally expressed as a sampled signal, which is passed to a component in one chunk. To perform time domain calculations, like feedback, the sampled signal must be converted to individual samples, which consist only of a single signal value and its corresponding position in time. This allows OptiSystem to propagate the samples through different components at different times. The attached project file Electric_Phase_Locked_Loop.osd is an example of an electrical feedback system.

You can follow the tutorial on this example at:

http://optiwave.com/resources/applications-resources/optical-system-electrical-pll/

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