Connet 1.0um band GHz linewidth of CW fiber laser is complicated. In order to achieve a linewidth in the order of GHz, Connet uses a single-frequency fiber laser as a seed laser, such as CoSF-D or CoSF-R, and its linewidth is narrow to the order of kHz, even less than 1kHz, the combination of a single-stage or multi-stage LiNbO3 phase modulator and a well-designed broadband noise source (WNS) achieves modulation broadening of a single frequency seed laser, and the output spectral width can reach tens of GHz.

The GHz linewidth CW fiber laser can be used as the seed laser source for kilowatt level narrow linewidth fiber amplifiers. The broadening spectrum through phase modulation single-frequency laser signal can maintain good single frequency characteristics during fiber amplification, while greatly improving the stimulated Brillouin scattering (SBS) threshold, this characteristic is very important in kilowatt level narrow linewidth fiber amplifier systems. A high power fiber laser that can maintain a narrow linewidth can be used for spectral combining and coherent combining to achieve very high energy laser output.

The Connet 1.0um band GHz linewidth CW fiber laser uses a single frequency fiber laser as the seed laser, which can ensure that the single frequency signal light maintains a high signal-to-noise ratio （OSNR） during high power amplification and is not prone to spectral broadening.