The invention relates to a method and apparatus for combining a plurality of optical signals having various wavelengths silryeoon the optical fiber 12 from the laser light source 10 in a spatially. Distributed optical device represented by a diffraction grating 16 couples a plurality of signals to the composite beam. Go over to the sample is then possible tuning of the combined beam passing through the etalon (etalon) (26) is analyzed by the arrival sensor (30). Etalon 26 that is continuously tuned to the pass band (passband), each pass band is in turn correspond to each of the optical signal wavelength. The sensor 30 measures the angle deviation of each of the beam caused by changes in wavelength, thereby generating an (over line 36) a control signal to adjust the respective wavelengths at their laser light source. Thus, the device allows relatively reliable a plurality of laser light sources 10 multiplexed (multiplexing) to the other hand, the etalon 26 and the sensor 30 to the service that are further to precisely and multiplexes the alignment of the beam in order to effectively guarantee that also generates the wavelength control signal to laser 10, is operatively connected to the controller 32.