Integrated low-loss free space wavelength division multiplexer

The invention provides an integrated low-loss free space wavelength division multiplexer, which comprises a first collimator for emitting optical signals, a first optical filter, a first reflector, a second optical filter, a second reflector, a first prism and a second collimator, and is characterized in that the signals collimated by the first collimator are transmitted to the first optical filter through Gaussian beams; the integrated low-loss free space wavelength division multiplexer provided by the invention has the advantages of high integration, low loss, low cost and the like, and has great use value and economic value. 本发明提供一种集成式低损耗自由空间波分复用器，包括用于发射光学信号的第一准直器，第一滤光片、第一反射镜、第二滤光片、第二反射镜、第一棱镜和第二准直器，经过所述第一准直器准直的信号通过高斯光束传输至所述第一滤光片，分离出投射信号和反射信号，本发明所提供的一种集成式低损耗自由空间波分复用器具有高度集成、损耗低、成本低等优点，具有极大的使用价值和经济价值。