Integrated optical switch formed in and on a semiconductor substrate, comprising a photoconductive body (PC) comprising a first end (1) configured to receive an electrical input signal and a second end (2) configured to provide an electrical output signal, the photoconductive body (PC) having an electrically conductive state activated by the presence of an optical signal (SO) and an electrically blocked state activated by the absence of the optical signal (SO), wherein the direction from the first end to the second end defines a longitudinal direction (D3), and the photoconductive body has a cross section orthogonal to the longitudinal direction (D3) gradually decreasing in the longitudinal direction (D3) from the first end (1) to the second end (2).
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