Generator for creating high frequency (HF), low noise signal

摘要

The first laser (1) is coupled to a second laser (2) via a single path line (3), so that the light generated by the first laser is injected into the second laser. The frequency difference of the two lasers, and the injected light intensity is chosen so that the second laser does not lock onto the first laser freewheeling frequency. Preferably the first laser is of the ECL type, while the second laser is of the DFB type. Typically a photoelectric converter (6) is coupled to the second laser output via an optical single path line (4) at the converter input. An optical modulator (9) may be linked in front of the converter.