Three kinds of MEMS optical switches with different mechanical structures are produced by the bulk micromachining processes.The first is 2D optical switch with horizontal actuator,the second is 2D optical switch with vertical actuator,and the third is 2D?3D optical switch with wiggly actuator.The first is formed with monolayer bulk silicon structure,the others use the silicon on glass bonding structures.Their principles of operation are all based on silicon digital micromirrors technology.The electrosta...