Two lasers mixing for generation of a modulated optical wave

In order to generate an amplitude modulated optical wave up to 275 GHz, we present an heterodyne technique using two 1.55 μm DFB lasers controlled in temperature by PC. Experimental set-up is described. Theoretical and experimental studies of the lasers spectrum are presented. Beating signal is observed in a 60 GHz bandwidth photodiode, frequency and power stability study is reported. Our final aim is the bandwidth measurement of photoreceivers and optical passive components for optical communications.