An optical telecommunication system with automatic channel switching is disclosed. The system is provided with two symmetrical fiber channels and two subsystems. Each subsystem is formed by two 2×2 optical switches that are connected to each end of the primary and secondary channels, including an input...http://www.google.de/patents/US7457537?utm_source=gb-gplus-sharePatent US7457537 - Optical telecommunication system with automatic channel switching
