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Present telescopes and future extremely large telescopes make use offiber-fed spectrographs to observe at optical and infrared wavelengths. The useof fibers largely simplifies the interfacing of the spectrograph to thetelescope. At a high spectral resolution (R>50,000) the fibers can be used toachieve very high spectral accuracy. GIANO is an infrared (0.95-2.5\mu m) highresolution (R=50,000) spectrometer[1] [2] [3] that was recently commissioned atthe TNG telescope (La Palma). This instrument was designed and built for directfeeding from the telescope [4]. However, due to constraints imposed on thetelescope interfacing during the pre-commissioning phase, it had to bepositioned on the rotating building, far from the telescope focus. Therefore, anew interface to the telescope, based on IR-transmitting ZBLAN fibers with 85\mu m core, was developed. In this article we report the first, preliminaryresults of the effects of these fibers on the quality of the recorded spectrawith GIANO and with a similar spectrograph that we set-up in the laboratory.The effects can be primarily associated to modal-noise (MN) that, in GIANO, ismuch more evident than in optical spectrometers, because of the much longerwavelengths.

Preliminary results on the characterization and performances of ZBLAN fiber for infrared spectrographs