Photodiode (PD) array with integrated back-side lenses and a multi-channel transceiver module implementing same

An optical transceiver, the optical transceiver comprising:

• a housing defining a cavity for receiving an optical transceiver module;
• and
• an optical transceiver module disposed at least partially within the cavity of the housing, the optical transceiver module comprising:
• a substrate having a first end that extends to a second end, the substrate having at least a first mounting surface;
• an on-board receiver optical subassembly (ROSA) arrangement, the on-board ROSA arrangement comprising:
• an array of photodiodes mounted to the first mounting surface of the substrate;
• an arrayed waveguide grating (AWG) mounted to the first mounting surface of the substrate, the AWG having an optical output port aligned and optically coupled to the array of photodiodes;
• and
• wherein each photodiode of the array of photodiodes include an integrated lens disposed thereon such that the integrated lens is substantially flush with a top surface defining each photodiode to increase an alignment tolerance between the AWG and a light sensitive region of each photodiode of the array of photodiodes;
• a transmitter optical subassembly (TOSA) arrangement mounted to the substrate.

A photodiode device for use in an optical subassembly, the photodiode device comprising:

• a base having at least first and seconds sides opposite each other;
• a plurality of electrical contacts disposed on the first side;
• a light-sensitive region;
• and
• an integrated lens disposed on the second side over the light-sensitive region such that the integrated lens is substantially flush with a top surface defining each photodiode to increase an alignment tolerance between an optical demultiplexer and the light-sensitive region of the photodiode.