Three-play integration mainly refers to the integration of services, using a new network structure to meet the needs of three services including video, data and voice. The three-network integration of radio and television operators can be realized based on the PON system. The principle is to integrate the PON system and the CATV system through WDM (wavelength division multiplexing) technology, and transmit 1550nm, 1490nm and 1310nm signals through one optical fiber. Among them, the downlink signal is divided into two channels, one is the PON data signal, the optical wavelength is 1490nm; the other is the CATV broadcast signal, the optical wavelength is 1550nm. The upstream signal is a PON data upstream signal with a wavelength of 1310 nm.