This document discusses MEMS optical switches, which use micro-mirrors to reflect light beams and connect an input light source to different output ports. Key points include: - MEMS optical switches allow optical signals to be switched without conversion to electrical signals, enabling compact, low-loss switching. - They can switch large numbers of optical signals simultaneously, making them suitable for use as trunk switches in large communication networks. - Various actuating mechanisms can be used to control the angle of the micro-mirrors, including electrostatic, electromagnetic, and scratch drive actuator approaches. - While MEMS optical switches show promising performance and scalability, challenges remain regarding their controllability, reliability, manufactur