The disclosed invention consists of a waveguide spectrometer (1), comprising at least one substrate layer (10) with at least one waveguide, each waveguide is extending from an inlet face (12) proceeding partly through the substrate layer (10) to a reflecting element (13), wherein a multiplicity of photo detectors (14) is arranged on a front side (I) of the substrate layer (10), while the photo detectors (14) are electrically connected to an electronic read out system, which should be lightweight and easier to produce. This is reached by forming the waveguides as surface waveguides (11, 11', 11", 11"'), each showing a longitudinal opening (110) with a width (D) to the front side (I) of the substrate layer (10) between the inlet face (12) and the reflecting element (13), while the photo detectors (14, 14', 14", 14"') are in print distributed at the front side (I) on top of the substrate layer (10) at least partly overlapping the longitudinal opening (110) of the surface waveguide (11) along an overall length of sampled region (Is) and the electrical connection of the photo detectors (14, 14', 14", 14"') with the electronic read out system is achieved by a multiplicity of printed electrical conductors (15).
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