Abstract: A monostatic coherent 1.55um continuous-wave (CW) laser Doppler wind velocimetry with an output power of 1W is presented, in which a fiber-optics polarization-maintaining circulator, coupler and a balanced detector is used. This system can perform line of sight velocity measurements of hard moving target at ranges of ~5m away from the telescope with a velocity accuracy of 0.021m/s and an excellent degree of speed correlation(R2=0.99) form a linear regression analysis of the system vs true moving target. Another ability of this velocimetry is also showed that the speed of air away from telescope ~25m is implemented.

Key words: LIDAR；velocimetry；all fiber optical heterodyne detection；CW laser