The measurement system consists of a mechanical structure, where a collimator is mounted on. This collimator can be moved in two dimensions to enable the measurement of predefined points. It is connected with a spectrum analyzer using an optical fiber. A computer controls the position of the collimator and initiates the spectrum analyzer to record the spectral curves, the maximum peak of power, the 3dB bandwidth and the total power of spectrum. The obtained data covers a measurement area of 0.91 m by 0.77 m which can be surveyed at a high local resolution of 0.7 mm. Collimated beams in the range between 600 and 1750 nm are analyzed. The measurement results discussed in this contribution are shown on the example of light sources, used in at TU Graz developed FSO-systems.
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Pirmin Pezzei, Nacira Stiebler, Thomas Plank, Juraj Poliak, Erich Leitgeb, Markus Löschnigg, "Measurement system for analyzing the spectral radiation pattern of light sources for FSO systems," Proc. SPIE 8874, Laser Communication and Propagation through the Atmosphere and Oceans II, 887406 (25 September 2013);