Optical transceiver with reduced height

A transceiver comprising:

• a light source die comprising a light source configured to be powered by applying a potential difference between first and second light source contacts on the light source die, the light source emitting light of a predetermined wavelength when so powered;
• a photodetector die comprising a photodetector configured to generate a signal between first and second photodetector contacts on the photodetector die in response to illumination of the photodetector die by light;
• and
• a substrate having first and second wells therein, the light source being mounted in the first well and the photodetector being mounted in the second well, the substrate and the first and second wells having a reflective surface that blocks light leaving the light source from reaching the photodetector without being reflected by an object that is external to the transceiver, the substrate further comprising first, second, third and fourth substrate contacts that are electrically connected to the first and second light source contacts, and the first and second photodetector contacts, respectively,
• wherein the second well comprises a reflective surface shaped to concentrate light received from outside of the transceiver onto the photodetector.