Abstract: Method for calibrating the deviation of a received beam in a terminal from its desired position. The received beam reaches a receiving sensor, and an acquisition beam an acquisition sensor of the terminal. The detection range of the acquisition sensor is greater than that of the receiving sensor. A portion of a transmitted beam emitted by the terminal to the partner terminal is guided as an incident beam on the reflecting surface, where it is reflected as an outgoing beam. A portion of the outgoing beam is respectively brought to the acquisition sensor and the receiving sensor. A respective measurement for the acquisition sensor and the receiving sensor is performed at least approximately isochronously; the measured results are compared for determining the deviation of the received beam from its desired position. Also a device for calibrating the deviation of a received beam in a terminal from its desired position.

Abstract: In a first variation, the novel optical unit (10) comprises several optical elements (14.1, 14.2, 14.3, 14.4, 14.5), and an integrally produced support structure (12) with element supports (16.1, 16.2, 16.3, 16.4, 16.5) for each of the optical elements (14.1, 14.2, 14.3, 14.4, 14.5). At least one of the element supports (16.1, 16.2, 16.3, 16.4, 16.5) is formed by a simply connected body, i.e. a linear support (16.4) or a plate (16.1, 16.2, 16.3, 16.5), or shell. The dimensions of this element support are matched to the optical element (14.1, 14.2, 14.3, 14.4, 14.5), wherein at least a portion of the element supports (16.1, 16.2, 16.3, 16.4, 16.5) is partially free along their rim. In a second variation the optical unit (10) comprises at least one optical element (14) and an integrally produced element support (16) made of the same material, preferably Zerodur®. The optical element (14) is preferably fastened directly on the element support (16) by gluing.