Nowadays, all the manufactured electronic components need to be tested to ensure the proper functioning and high level of quality; Spea S.p.a is an Italian company that manufactures systems specifically designed for this purpose, from semiconductor to functional tester. In the last year the test requirements are becoming increasingly stringent in terms of accuracy and measure precision and lately there has been a growing need to be more accurate in positioning and orientation of the testing tool inside the machines. A new field in the test application is related to silicon photonics components that in addition to the standard electrical test introduce a new characterization: the light test.