A constant illumination optical transmission method for freespace biological networks   Forrest Fabian Jesse1,3*, Zhenjiang Miao1, Yao Chen2, Hechen Bao3, and Weidong Li3*   1School of Computer and Information Technology, Beijing Jiao Tong University, Beijing, 100044, China 2Department of Pharmacology and Toxicology, Medical College of Wisconsin, 8701 W Watertown Plank Rd, Milwaukee, WI 53226, USA 3Bio-X Institutes, Shanghai Jiao Tong University, Shanghai, 200240, China     Abstract: Development of a biological internet requires the development of transmission and spatial information protocols. We present a free-space, constant illumination light-based signaling protocol and its optigenetic neuron receiver. The receiver functions as a simple processor which outputs information to its connected network.