Fig. 1. (a) Schematic diagram of experimental setup to evaluate transmission characteristics of 300-GHz
wireless link based on ASK modulation and direct detection. (b) Bit error rate (BER) characteristics at
40 Gb/s and 42 Gb/s and corresponding demodulated eye diagrams at 40 Gb/s. Photocurrent
[horizontal axis of (b)] is proportional to the square root of the transmitted power.