Connet provides PM large mode field area (PLMA) high-power optical isolators and optical circulators for use with high-power single-frequency polarization-maintaining pulsed fiber lasers. For example, CoLIS-HP series single-frequency fiber lasers are used in coherent Doppler LiDAR. Large mode field area (LMA) optical fiber can accommodate multiple laser mode transmission because the core diameter can reach 25um to 30um, Connet with more than 15 years of optical fiber processing experience and leading optical fiber cutting, optical fiber fusion splicing, optical fiber taper, optical fiber coating and high-power optical fiber device packaging equipment and technology, to ensure that the LMA fiber optical isolator and optical circulator achieve near-diffraction limit output beam quality, withstand high peak power and high single pulse energy, which is beneficial to customer's coherent LiDAR system integration.