COF Communications Co.,Ltd has abundant productive technology and skills about  passive device and a group of experienced workers. It cooperates with many North America companies and consistently develops new productive skills and products, which consummate the company?s products skills and makes it become one of the biggest mass production bases of passive optical elements. Relaying on the advanced manufacturing mode, basic science power of inland and abundant marketing information, COF Communications Co.,Ltd is making progress in the optical communication field. At the present, it has the capability of producing all kinds of products and spares no effort to keep them has the special characteristics of COF Communications Co.,Ltd. We integrate MEMS technology into optical switch and attenuator which is the smallest one and has the fastest switching time in the world. Attenuator has three levels according to its switching time, they are ms, us, ns, and it developed by us and gets rid of the constraint of abroad MEMS CHIP technology. At the time of developing the products technology and mass production skills, we emphasis on the quality policy: ?greeting market challenges with consistently development and innovation, satisfying consumers? needs with remarkable quality and service?.