Patent ID: 8227743

Claim:
An arrangement for a selection of a wavelength including: a wavelength source for providing a plurality of wavelengths, wherein the wavelength source is a source disc including a plurality of laser diodes, each of which is configured to emit a single wavelength; a wavelength selector separate from said wavelength source for allowing a selection of a single wavelength from the wavelength source, said wavelength selector comprising a rotatable disc having only one aperture to allow therethrough only the single wavelength at one time from the plurality of wavelengths; and a wavelength detector to detect the single wavelength for subsequent use, said wavelength source being fixed in relation to said wavelength detector and allowing the alignment of the aperture of the wavelength with said source disc and said wavelength detector at the same time to allow the single wavelength through at one time to said wavelength detector, wherein, in a first operating mode, each laser diode is aligned with a corresponding fibre optic head, and a wavelength is selected by rotating the selector disc so that the aperture is co-axially aligned with the laser diode emitting a selected wavelength, to allow the single wavelength therethrough for detection by the corresponding fibre optic head, and wherein, in a second operating mode, the aperture of the selector disc is aligned with a corresponding fibre optic head, and a single wavelength is selected by rotating the source disc so that the laser diode emitting the single wavelength is co-axially aligned with the aperture, to allow the single wavelength therethrough for detection by the corresponding fibre optic head.