**What is a 30 dB gain means???**

Puzzled..Earlier I use to be the same but its really simple to understand.It means:-

*For every input PHOTON there will be 1000 PHOTON's at output. That's what Gain is..*

**X dB is 10**

^{x/10}

^{}^{You can verify the same with above formula...Make things Simpler.}