Optical switching is often thought of as the Holy Grail of optical signal processing. Techniques used to switch optical fiber paths have become a subject of on-going research and development, and optical switch performance continues to improve. In the past few years, new optomechanical fiber optic switch technologies have been developed by DiCon Fiberoptics which offer readily available fiber optic switches with stable, low losses. These fiber optic switches offer tremendous potential for systems requiring optical signal routing.
Gerry A. Pesavento,
"Optomechanical M x N fiber-optic matrix switch", Proc. SPIE 1474, Optical Technology for Signal Processing Systems, (1 September 1991); doi: 10.1117/12.44906; https://doi.org/10.1117/12.44906