Optical attenuator is a passive optical device, mainly used to reduce the optical power of the optical signal to prevent the optical receiver from reaching the optical power beyond the load range caused by signal distortion; there is a situation in the multi-wavelength channel fiber System, the need

Fiber to the home (FTTH) to the home access network based on passive optical network technology (PON, passive optical network) is a point to multipoint network structure, that is, the use of optical splitter center signal to multiple end users. Optical splitter has two different distributions in the