Figure 4
From: On-chip wireless silicon photonics: from reconfigurable interconnects to lab-on-chip devices
Experimental high-speed long-reach wireless data transmission. (a) Experimental (blue) and theoretical (red) power efficiency for different distances d. The theoretical efficiency is obtained as ηP=(DηTηG)2CR, where D is the antenna directivity, ηG accounts for the experimental grating coupler insertion losses, and CR for the reflections at the top and bottom SiO2 interfaces (Supplementary Information). For comparison purposes, the simulated efficiency corresponding to a bare tapered antenna with no directors is also included for the 100-μm link. (b) Simulated and experimental (retrieved from the measurements with the previous formula) antenna gain, defined as G=DηT. (c) BER measured with an error analyzer and evaluated as a function of the decreasing optical power received by the photodetector for a baseline configuration where the wireless link was replaced with a silicon straight waveguide (left) and for a 100-μm wireless link (right). The 160 Gbit s−1 BER corresponds to the demodulation of channel 34 when transmitting channels 33 to 36. The crosstalk produced by surrounding channels (33, 35 and 36) introduces low penalties. (d) Schematic top view of the antenna and directors. (e) SEM image of a point-to-point link with d=10 μm.
