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Connet Single Frequency PM Fiber Amplifier adopts full polarization-maintaining optical fiber link design, multi-stage power amplification for narrow linewidth (kHz) single-frequency signals to achieve high power output, the output beam quality is close to the diffraction limit, and the high polarization extinction ratio (PER). The high-power single-frequency polarization-maintaining fiber amplifier integrates Connet's unique stimulated Brillouin scattering (SBS) suppression technology and polarization control and maintenance technology. The output power is selectable from the order of 100mW to 100W to meet the needs of different applications.