Single-Fiber Bidirectional Optical Data Links with Monolithic Transceiver Chips
Figure 2
Photograph of a transceiver chip consisting of a VCSEL and a PIN photodiode, each with indicated ground-signal-ground (GSG) microwave probe contacts. The VCSEL is positioned off-center with respect to the photodetector in order to maximize the effective photodetecting area of the transceiver. The dashed circle indicates the alignment of a MMF with 50 μm core diameter (from [20]).