Abstract: A wavelength detector configuration for detecting the Bragg wavelength of at least one Bragg grating in at least one FBG sensor, in which light reflected by each Bragg grating is conducted by fiber couplers into two detector channels, each containing a detector, whereby an evaluator device is provided to detect the signals of the detectors and to determine the Bragg wavelength from a quotient of the detector signals, the detectors of each pair of detector channels having narrowband spectral sensitivities that overlap with one another and who central wavelengths of maximum sensitivity span a wavelength range containing the Bragg wavelength of the corresponding Bragg grating.