OPTICAL RECEIVING COMPONENT, COMBINED TRANSCEIVER COMPONENT, COMBINED OPTICAL MODULE, OLT, AND PON SYSTEM

Embodiments of this application provide a receiver optical sub-assembly, a combo bi-directional optical sub-assembly, a combo optical module, an optical line terminal, and a passive optical network system, and relate to the field of optical communications technologies. The receiver optical sub-assembly includes a first transistor-outline can, where a light incident hole is disposed on the first transistor-outline can, and a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can. Light enters the first demultiplexer through the light incident hole, and the first demultiplexer is configured to transmit an optical signal of a first wavelength and reflect an optical signal of a second wavelength. The first optical receiver is disposed on a transmission optical path of the first demultiplexer, and the first optical receiver is configured to receive the optical signal of the first wavelength. The optical lens combination is disposed on a reflection optical path of the first demultiplexer, and the optical lens combination is configured to guide, to the second optical receiver, the optical signal of the second wavelength that is reflected by the first demultiplexer. The second optical receiver is configured to receive the optical signal of the second wavelength.