u/AffectionateSun9217

Say, I want to design an AGC loop for a fiber optic system. How do I select the bandwidth of the loop and why ? I have seen loops for 10Gb/s systems that are operating at 7.5GHz of Bandwidth.

For a wireless systems, we want a fast loop if we want to track rapid variations in received signal level but balancing this with not tracking so fast such as to remove amplitude as part of the information modulation. So people pick a bandwidth or say data rate/100 or data rate/20

Why is fiber optic data different is it because it is NRZ or PAM 4 ?

Basically, how do you select the bandwidth of your AGC loop and all its component blocks ?

Thanks.