Negative dB in Optical Spectrum Analyzer Plots: What's the Explanation?

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How did you find PF?
Definitely it is a great forum where I can improve my knowledge.
Need help. Why optical spectrum analyzer plots are in negative dB ?
 
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Hi everyone, I'm just a physics enthusiast. I took some first-year courses a long time ago, but I wasn't able to continue, so I don't have a degree. Still, I'm really passionate about the subject and try to keep up with it as much as I can. I mostly study in my (limited) free time, going through books I didn’t get the chance to read when I was younger. Thanks for your attention!
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