Study on separation and coupling of multiplex spatial mode to create MIMO technology for optical fibers

我们研制了一种能够耦合和分离光纤中传输的空间模的动态可重构光学器件。此外，我们还对不同空间模式的连接光纤进行了无偏振光耦合实验。利用多重体全息衍射元件和光折变晶体，通过空间模光束和控制光束之间的光学干涉实现了模式分离。此外，还利用空间光调制器的一阶衍射光进行了模式激发。

We developed the dynamic reconfigurable optical device that can couple and separate spatial modes propagating in an optical fiber. In addition, we carried out the experiment on polarization-free optical coupling for connected optical fibers having different spatial modes. Mode separation was achieved via optical interference between spatial mode beams and control beams, by using a multiplex volume holographic diffraction element with a photorefractive crystal. Furthermore, mode excitation was carried out using a first-order diffraction beam from a spatial light modulator.