Abstract: A multi-channel optical transmitter or transceiver includes an optical multiplexer with input and output ports on a single side. The optical multiplexer receives optical signals at different channel wavelengths on a plurality of mux input ports on one side and combines the optical signals into a multiplexed optical signal, which is output on an optical output port on the same side. The optical multiplexer may be located at a distal end of a transceiver or transmitter housing. In one embodiment, the optical multiplexer is a reversed planar lightwave circuit (PLC) splitter including splitter output ports that are used as the mux input ports and a splitter input port that is used as the mux output port. The mux input ports may be optically coupled to respective transmitter optical subassembly (TOSA) modules with optical fibers.

Abstract: A multi-channel optical transmitter or transceiver includes an optical multiplexer with input and output ports on a single side. The optical multiplexer receives optical signals at different channel wavelengths on a plurality of mux input ports on one side and combines the optical signals into a multiplexed optical signal, which is output on an optical output port on the same side. The optical multiplexer may be located at a distal end of a transceiver or transmitter housing. In one embodiment, the optical multiplexer is a reversed planar lightwave circuit (PLC) splitter including splitter output ports that are used as the mux input ports and a splitter input port that is used as the mux output port. The mux input ports may be optically coupled to respective transmitter optical subassembly (TOSA) modules with optical fibers.

Abstract: In accordance with an embodiment, a transmitter optical subassembly (TOSA) having one or more recessed mounting regions is disclosed in order to decrease the overall footprint of the TOSA within an optical transceiver housing. The TOSA includes a housing having at least a first sidewall and a second sidewall disposed on opposite sides of the housing relative to each other. The housing further includes a first step portion defined by the first sidewall and a first recessed mounting region extending from about the first step portion along the longitudinal axis towards the second end. The first recessed mounting region is defined by an external surface of the first sidewall that is offset from a surface defining the first step portion by a first offset distance. The first recessed mounting region includes at least one sidewall opening to couple to optical component assemblies.