Fiber optic switches are devices used to control the flow of light in fiber optic networks. They are used in a wide range of applications, including telecommunications, data centers, industrial automation, and military and aerospace. The simplest device is an on/off switch with one input and one output, which allows. Fibertronics, Inc. a relay that that could pass or block fiber transmissions when voltage was applied or removed? And, no, I don't want to shut of my network rack switch and I'm worried that a switch at the workstation.