What is the implementation principle of GPON BOSA in ONU?
ONU is an important device in fiber to the home (FTTH) and other access networks, in which Bosa optical devices are mainly used to transmit and receive optical signals. In the downlink direction, it receives the optical signal from the OLT (optical line terminal), converts it into an electrical signal, so that the ONU can carry out subsequent processing and data extraction, and provide various services for the user, such as broadband Internet access, IPTV, etc. In the upstream direction, the Bosa optical device converts the electrical signal generated by the user in the ONU into an optical signal and sends it to the OLT to upload the user data.
Using wavelength isolation technology, BOSA multiplexes uplink (user sent) and downlink (user received) optical signals to a single fiber using a 1310nm/1490nm dual-wavelength (GPON) or single-fiber bidirectional (Bidi) scheme. Its core component integrates a laser transmitter (TOSA) and a light detector (ROSA), which separate light signals of different wavelengths through a built-in WDM filter or splitter: downlink 1490nm light is reflected to the detector through the filter, and uplink 1310nm light is emitted by the laser through the filter.
