Hologram Switch

The optical switch, which is a key component of communication networks, has been studied with various designs and fabrication methods. Optical signal switching in a network system is realized by optical switching devices which are categorized into two types depending on whether they use optical waveguides or free-space transmission. The free-space transmission type optical switches are constructed with twoor three-dimensional microelectromechanical system (MEMS) mirrors. However, they have a disadvantage in terms of the switching time because they are operated mechanically. On the other hand, the waveguide type optical switches using waveguides with the electro-optic (EO) effect are more promising from a practical viewpoint because of their operational speed.
Fig. 1 Classification and properties of Hologram optical swtich.

Fig. 2 Experiments to verify the principle of hologram optical switch.