Techniques for indirect optical coupling between an optical input/output port of a subassembly housing and an arrayed waveguide grating (AWG) device disposed within the same

An optical transceiver comprising:

• a first housing portion comprising a plurality of sidewalls extending from a first end to a second end along a first longitudinal axis, wherein the plurality of sidewalls define a first cavity having a first longitudinal center line, the first cavity for receiving one of a transmitter optical subassembly (TOSA) or receiver optical subassembly (ROSA);
• a second housing portion for coupling to the first housing portion, the second housing portion comprising a plurality of sidewalls extending from a first end to a second end along a second longitudinal axis, wherein the plurality of sidewalls define a second cavity for receiving the other of the TOSA or ROSA;
• an optical multiplexing device at least partially disposed within the first cavity and having an input port with a first optical center line, wherein the optical multiplexing device includes a plurality of input ports to receive channel wavelengths from associated laser assemblies and an output port to output a signal having multiple channel wavelengths, wherein the plurality of input ports and the output port are located on one side of the optical multiplexing device;
• a first optical coupling port at the first end of the first housing portion, the optical coupling port having a second optical center line;
• a first optical fiber having a first end optically coupled to the optical coupling port and a second end optically coupled to the multiplexing device;
• and
• wherein the first optical center line of the input of the multiplexing device is laterally offset by a distance D from the second optical center line of the optical coupling port.