Single-Fiber Bidirectional Optical Data Links with Monolithic Transceiver Chips

Figure 4

Schematic cross-sectional view of the fully processed transceiver chip consisting of a monolithically integrated PIN photodetector separated by a 2 to 4 μm wide trench from the top-emitting, oxide-confined VCSEL. Both devices feature top-accessible contacts (from [24], © 2011 IEEE).