XGSPON ONU BOSA is a bi-directional transceiver device with symmetric 9.953Gbps upstream and 9.953Gbps downstream. The device consists of a transmitter, a receiver and a piece of WDM filter. The transmitter section uses the 1270nm DFB laser with a monitor photodiode, and the receive section uses the 1577nm receiver with APD and TIA. It is designed for optical network unit (ONU) module.