Optical fiber data link system

An optical fiber data link system comprising a controller and at least one station connection to each other by a series of optical fibers which, as a whole, substantially makes a single loop while linking them together, said controller at least including (a) a light receiving element connected to a fiber of said loop for receiving optical signals therefrom and developing an indication responsive thereto, (b) a serial-parallel converter for converting the indication of a parallel signal, (c) a circuit for generating a signal to allow said station operative on said parallel signal to determine which of two signals, i.e., address signal or data signal, has been received thereby, (d) an address setting circuit, (e) a parallel-serial converter and (f) a luminous element for receiving signal data and providing serial optical signals to a fiber of said loop, said station at least including (i) a light receiving element, (ii) a serial-parallel converter, (iii) a circuit for determining which of two signals, i.e., address signal or data signal has been received by the station, (iv) a parallel-serial converter and (v) a luminous element, said elements (i)-(v) of a station being interconnected for receiving data from a first fiber of said loop, and for transmitting data to a next fiber of said loop, at least one data module being connected to said station, and said at least one data module having an address of its own assigned thereto in advance.