Optimization of photoswitch constituted of a coplanar line introducing an interdigitated MSM photodetector

•Simulation of photoswitch constituted of a coplanar line.•Using of MSM photodetector for the coplanar line interruption.•Study of the MSM geometrical parameters influence on the photoswitch behavior.•Optimization by the introduction of linear shaped tapers.•Optimization by the tightening of ground planes around the central strip.

In this paper we present the optimization of photoswitches constituted of a coplanar line introducing interdigitated MSM photodetectors in the central strip. The reflection and the transmission coefficients are studied with the aim of highlighting the influence of different geometrical parameters on the photoswitch microwave behavior. In pursuance of improving the performances, new topologies of coplanar lines introducing tapers of linear shapes, as well as tightening of ground planes around the central strip are proposed and studied. The outcomes showed that it is possible to achieve high insulation (−52.3 dB) at the Off state. As for as the On/Off ratio is concerned, a value of 48.8 dB is reached.