System for transmitting and monitoring laser light and method for optical monitoring of a transmission path
 A system and method for transmitting and monitoring laser light includes a laser for emission of a first beam with a given wavelength into a transmission path. A second beam is generated with a wavelength differing from the given wavelength. The second beam is coupled into the transmission path of the first beam and the first and second beams are superimposed in a propagation direction. The second beam is wavelength-selectively reflected in the transmission path as a reflected second beam. The reflected second beam is decoupled from the transmission path. A detector is provided for the reflected second beam. An interruptor is operatively connected to the detector for interrupting the first beam. 
Siemens Aktiengesellschaft
G G B
G02B G02B B23K
inventional additional inventional
Richard Klaus
Walker Ludewigt