Receiver Optical Sub-Assembly, Combo Bi-Directional Optical Sub-Assembly, Combo Optical Module, OLT, and PON System

A combo bi-directional optical sub-assembly, comprising:

• a housing;
• an optical transmission channel disposed in the housing;
• a second demultiplexer disposed on the optical transmission channel, wherein an optical receive port, an optical transmit port, and an optical fiber connection port are in communication with the optical transmission channel and disposed in the housing;
• and
• a receiver optical sub-assembly, wherein the receiver optical sub-assembly comprises a first transistor-outline can, wherein a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination are packaged in the first transistor-outline can, and wherein the receiver optical sub-assembly is packaged at the optical receive port,
• wherein the first demultiplexer is disposed on a direction in which light enters the first transistor-outline can, and wherein the first demultiplexer is configured to transmit a first optical signal of a first wavelength and reflect a second optical signal of a second wavelength, and wherein the second demultiplexer is configured to reflect, to the optical receive port, the first optical signal and the second optical signal that enter from the optical fiber connection port.

A passive optical network system, comprising:

• an optical line terminal (OLT) comprising a receiver optical sub-assembly, wherein the receiver optical sub-assembly comprises a first transistor-outline can, and wherein the first transistor-outline can comprises a first demultiplexer, a first optical receiver, a second optical receiver, and an optical lens combination;
• an optical distribution network (ODN) connected to the OLT;
• and
• a plurality of optical network units (ONUs) connected to the ODN.