Transmitter optical subassembly with hermetically-sealed light engine and external arrayed waveguide grating

An optical transceiver comprising:

• a housing;
• a transmitter optical subassembly (TOSA) module disposed in the housing, the TOSA module comprising:
• a hermetically-sealed light engine with a housing that defines a hermetic-sealed cavity and at least one laser package disposed within the hermetic-sealed cavity, wherein the housing further includes a thermoelectric cooler (TEC) sub-mount disposed within the hermetic-sealed cavity, and wherein the at least one laser package is mounted to the TEC sub-mount;
• an arrayed waveguide grating (AWG) disposed externally from the hermetic-sealed cavity and optically coupled to the hermetically-sealed light engine to receive a plurality of associated wavelengths and output a multiplexed signal base;
• a receive optical subassembly (ROSA) module disposed in the housing;
• a substrate defined by first and second surfaces disposed opposite each other, the substrate including an electrical coupling region for electrically coupling with a transmit connecting circuit and a light engine interface region for electrically coupling with the hermetically-sealed light engine;
• a light engine driving circuit disposed on the substrate to provide a radio frequency (RF) signal and a power signal to drive the hermetically-sealed light engine to output one or more channel wavelengths;
• and
• wherein the substrate includes at least a first trace disposed on the first surface to provide the power signal, and at least a second trace disposed on the second surface to provide the RF signal, the first and second traces being disposed in an opposing arrangement to provide electrical isolation to reduce electrical interference between the power signal and the RF signal.

A transmitter optical subassembly (TOSA) module comprising:

• a hermetically-sealed light engine with a housing that defines a hermetic-sealed cavity and a temperature controlled laser arrangement thermally coupled to a sidewall within the hermetic-sealed cavity, the temperature controlled laser arrangement including a thermoelectric cooler (TEC) sub-mount and a plurality of laser devices disposed on the TEC sub-mount within the hermetic-sealed cavity for emitting a plurality of associated channel wavelengths;
• a multiplexing device disposed externally from the hermetic-sealed cavity and optically coupled to the hermetically-sealed light engine to receive the plurality of associated wavelengths and output a multiplexed signal base;
• and
• a substrate defined by first and second surfaces disposed opposite each other, the substrate including an electrical coupling region for electrically coupling with a transmit connecting circuit and a light engine interface region for electrically coupling with the hermetically-sealed light engine;
• a light engine driving circuit disposed on the substrate to provide a radio frequency (RF) signal and a power signal to drive the hermetically-sealed light engine to output one or more channel wavelengths;
• and
• wherein the substrate includes at least a first trace disposed on the first surface to provide the power signal, and at least a second trace disposed on the second surface to provide the RF signal, the first and second traces being disposed in an opposing arrangement to provide electrical isolation to reduce electrical interference between the power signal and the RF signal.