Tips for Successful Use
The physics of broadband RF over fiber circuit limits its use to signals that fall within the dynamic range of the device. For example, any signal above -75 dBm and below -15 dBm would be considered to be within the usable range. There are many instruments that can measure well below the -75 dBm level and see various forms of noise. Most of that noise is typically ingress-type noise that is expected in a broadband system.
The same limitations are found in a broadband receiver front end, or an IF strip. The dynamic range, though considerable, is always limited.
Some things to keep in mind:
High sensitivity spectrum analyzers are great! They have sensitivities far below the noise floor of many closed systems, including the Optix. If you look low enough, you will start to see signals. More often than not these are signals that exist in your environment (ingress) or are mixing products (sometimes called "intermod") caused by one or more signals in the Optix passband that exceed the -15 dBm clipping level.
Remember that the dynamic range is 60dB, and the operating floor is -75dBm.