operation of an optical intensity/phase modulator

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Hello everybody,

Normally there is an RF and a DC input to an intensity modulator. I wonder what could be the case of applying only the RF input. For instance, our laser's frequency is in in THz range. We would like to check the time resolved behaviour of the laser by a modulator. For this purpose we supply an RF signal from the signal generator in the 500 MHz to 1 GHz range, and leave the DC input as it is. So what should be the optical output in this case? Thanks :)