https://www.meisuoptics.com/products/micro-optical-switch/ This kind of micro mechanical optic switch is driven by a relay to control the prism to turn, thus switch the path, with only few channels such as 1x1,1x2, and2x2. It is normally used for OLP (Optical Fiber Line Protection) system. This mini switch can be seen as an updated version of the regular mechanical optical switch in terms of the size of the case. Therefore, compared with the normal mechanical switches, it is more integratable.