Abstract: A laser device incorporates a rectangular multi-mode beamsplitter waveguide connected at one end to a retro-reflecting mirror. The beamsplitter waveguide is connected at a second end to an output coupling waveguide and a reflection coupling waveguide. The reflection coupling waveguide is terminated by a second retro-reflecting mirror. Radiation produced within the device is reflected by the mirror and coupled to the two coupling waveguides in a manner such that a partially reflecting mirror is not required at an output to the device.

Abstract: This invention relates to a modular, interconnecting component optical fibre based communication system with coherent and incoherent optical signals from local area networks being converted into laser signals at either end of long-haul land or submarine cables incorporating laser amplifier repeaters, connecting said networks. The invention can accommodate both amplitude and frequency modulation signal transmission and detection. The invention has applications in high data transfer rates between local, national and international communication centers and can be utilized in vehicles where system weight and data rate capabilities are important.