Fig. 6. Demonstration of applications using biometrics-protected optical communication.

(A) Operation principle of demonstrations. Uploaders use an upload interface, TEB scanner, and BOIMUX to upload files to the cloud. The cloud implements data demultiplexing, identification, display, and storage. Requesters use TEB scanner and BOIMUX to send their biometric information for identification. Upon successful request, the requester will receive the requested file (in document exchange) or be able to control smart devices via the cloud (in smart home control). (B) Exemplary upload and request waveforms and the receiving interface. User identification and authority check are successful. The text file in the form of digital information is embedded in the multiplexed waveform O_bioO_info (cyan). The information is correctly decoded and displayed as a paragraph starting with Biometrics (pink) and ending with individuals! (yellow). The difference between upload and request from the same user is the existence of meaningful O_info. During upload, O_info contains digital information that can be effectively carried over by O_bioO_info and captured and recovered by the cloud. In contrast, O_info will be constantly 1 in the request process. (C) Exemplary control waveforms and the controlled smart home in the VR space. The three-digit binary codes 011, 010, and 001 are used for light, TV, and sweeping robot control, respectively.