Digital tunable optical attenuator is mainly used to attenuate the power of continuous optical signal. With advanced high-performance core devices abroad, the system has complete functions, such as fast adjustment of attenuation value, good linearity, high accuracy, low insertion loss, high resolution, attenuation location and so on. It is widely used in the construction and maintenance of optical cable, optical fiber communication, optical fiber sensors, optical fiber CATV and other fields. The body shape design meets the requirements of ergonomics and adopts advanced cold-plastic moulding technology, which is beautiful and durable. It is simple, reliable and suitable for various use environments.