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Check your knowledge on OMI adjustment of the optical link


Each Return path optical link must be tuned to have the right operating point. The goal is to adjust the OMI (Optical Modulation Index) to avoid excess of noise or excess of intermodulation.

Usually, we define an OMI operating point based on the total RF Power modulating the transmitter. The NPR diagram is very useful for this purpose. Then, we can deduce the OMI per channel.


But how can we calculate all the RF levels along the optical link, needed to fix the right operating point?

Below, you can find an example of a situation where you need to calculate the levels based on the specifications of the transmitter and the receiver.

Let's go. Check your knowledge! Calculate the unknow value "?"