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The quest for extrasolar planets and their characterisation as well asstudies of fundamental physics on cosmological scales rely on capabilities ofhigh-resolution astronomical spectroscopy. A central requirement is a precisewavelength calibration of astronomical spectrographs allowing for extraction ofsubtle wavelength shifts from the spectra of stars and quasars. Here, wepresent an all-fibre, 400 nm wide near-infrared frequency comb based onelectro-optic modulation with 14.5 GHz comb line spacing. Tests on thehigh-resolution, near-infrared spectrometer GIANO-B show a photon-noise limitedcalibration precision of <10 cm/s as required for Earth-like planet detection.Moreover, the presented comb provides detailed insight into particularities ofthe spectrograph such as detector inhomogeneities and differential spectrographdrifts. The system is validated in on-sky observations of a radial velocitystandard star (HD221354) and telluric atmospheric absorption features. Theadvantages of the system include simplicity, robustness and turn-key operation,features that are valuable at the observation sites.

Broadband near-infrared astronomical spectrometer calibration and on-sky validation with an electro-optic laser frequency comb