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The Prime Focus Spectrograph (PFS) is an optical/near-infrared multifiberspectrograph with 2394 science fibers distributed across a 1.3-deg diameterfield of view at the Subaru 8.2-m telescope. The wide wavelength coverage from0.38 {\mu}m to 1.26 {\mu}m, with a resolving power of 3000, simultaneouslystrengthens its ability to target three main survey programs: cosmology,galactic archaeology and galaxy/AGN evolution. A medium resolution mode with aresolving power of 5000 for 0.71 {\mu}m to 0.89 {\mu}m will also be availableby simply exchanging dispersers. We highlight some of the technological aspectsof the design. To transform the telescope focal ratio, a broad-band coatedmicrolens is glued to each fiber tip. A higher transmission fiber is selectedfor the longest part of the cable system, optimizing overall throughput; afiber with low focal ratio degradation is selected for the fiber-positioner andfiber-slit components, minimizing the effects of fiber movements and fiberbending. Fiber positioning will be performed by a positioner consisting of twostages of piezo-electric rotary motors. The positions of these motors aremeasured by taking an image of artificially back-illuminated fibers with themetrology camera located in the Cassegrain container; the fibers are placed inthe proper location by iteratively measuring and then adjusting the positionsof the motors. Target light reaches one of the four identical fast-Schmidtspectrograph modules, each with three arms. The PFS project has passed severalproject-wide design reviews and is now in the construction phase.

Prime Focus Spectrograph for the Subaru telescope: massively multiplexed optical and near-infrared fiber spectrograph