#fiber-optic_transmission_system__fibre-optic_transmission_system__FOTS  a communication system using fiber optic cables
  supertype:  communication_equipment__communicationequipment__communication_system__communicationsystem  facility consisting of the physical plants and equipment for disseminating information
  part:  fiber_optic_cable__fiberopticcable__fibre_optic_cable__fibreopticcable  a cable made of optical fibers that can transmit large amounts of information at the speed of light
     part:  optical_fiber__opticalfiber__glass_fiber__glassfiber__optical_fibre__opticalfibre__glass_fibre__glassfibre  a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images

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