An optical device for determining a distance of a measurement object, the optical device comprising:
- at least one LIDAR unit, having at least one illumination device configured to generate at least one frequency-modulated input light beam and to illuminate the measurement object with the at least one frequency-modulated input light beam, wherein the at least one LIDAR unit has at least one measurement channel configured to detect at least one measurement beam reflected from the measurement object in response to the at least one frequency-modulated input light beam and to generate at least one LIDAR measurement signal;
- at least one light sensor having at least one optical source with at least one mode-locked laser, wherein the at least one mode-locked laser is configured to generate at least one first frequency comb signal and at least one second frequency comb signal, wherein the at least one light sensor is configured to split the at least one first frequency comb signal into at least one first measurement signal and at least one first reference signal and to illuminate the measurement object with the at least one first measurement signal, wherein the at least one light sensor is configured to split the at least one second frequency comb signal into at least one second measurement signal and at least one second reference signal, wherein the at least one light sensor has at least one measurement detector and at least one reference detector, wherein the at least one measurement detector is configured to detect the at least one first measurement signal reflected from the measurement object and the at least one second measurement signal, wherein the at least one reference detector is configured to detect the at least one first reference signal and the at least one second reference signal;
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- at least one evaluation unit configured to determine at least one item of first distance information of the measurement object from the at least one LIDAR measurement signal, wherein the at least one evaluation unit is configured to evaluate signals respectively detected by the at least one measurement detector and the at least one reference detector and to generate at least one frequency spectrum of the respective signals, wherein the at least one evaluation unit is configured to determine at least one item of second distance information of the measurement object from a comparison of the at least one frequency spectrum detected by the at least one measurement detector and the at least one frequency spectrum detected by the at least one reference detector.