Simultaneous characterization of bidirectional coupler and semiconductor photodetectors spectral properties

The method of simultaneous measurement of bidirectional coupler and semiconductor photodetectors spectral properties is presented. InGaAs and Ge photodiodes are used as photodetectors. The simulation of fiber-optic coupler spectral behavior, as well as the process of calculating fiber-optic coupler coupling ratio from data acquired by measurements is given. Furthermore, the responsivities of both photodetectors are calculated on the basis of the obtained coupling ratio.