How can create feedback with individual sample?

[stack programer]

i find this link, that discuss about individual feedback,

Lesson 6: Time-Driven Simulation — Working with Individual Samples

in this link is talked that:
Individual sample is a signal type that allows the users to simulate time-driven systems in the electrical and optical domain. By using time-driven simulation, users can create designs that have closed loops and feedbacks.
So i want to can any one explain me how we can use individual sample for create feedback…….
thanks

[stack programer]

any one has not any idea,really optisystem how can handle feedback??

[stack programer]

i concluded that these block is used in pll sample feed back

Electrical PLL

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