FOCCoS, Fiber Optical Cable and Connector System, has the main function ofcapturing the direct light from the focal plane of Subaru Telescope usingoptical fibers, each one with a microlens in its tip, and conducting this lightthrough a route containing connectors to a set of four spectrographs. Theoptical fiber cable is divided in 3 different segments called Cable A, Cable Band Cable C. Multi-fibers connectors assure precise connection among alloptical fibers of the segments, providing flexibility for instrument changes.To assure strong and accurate connection, these sets are arranged inside twotypes of assemblies: the Tower Connector, for connection between Cable C andCable B; and the Gang Connector, for connection between Cable B and Cable A.Throughput tests were made to evaluate the efficiency of the connections. Alifetime test connection is in progress. Cable C is installed inside the PFI,Prime Focus Instrument, where each fiber tip with a microlens is bonded to theend of the shaft of a 2-stage piezo-electric rotatory motor positioner; thisassembly allows each fiber to be placed anywhere within its patrol region,which is 9.5mm diameter.. Each positioner uses a fiber arm to support theferrule, the microlens, and the optical fiber. 2400 of these assemblies arearranged on a motor bench plate in a hexagonal-closed-packed disposition.
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