Abstract: Disclosed is a system and method for communication using an efficient fiber-to-chip grating coupler with a high coupling efficiency.

Abstract: An optical device includes a waveguide configured to guide light, a taper integrated with the waveguide on a substrate configured for optical coupling, and an attenuator to degrade unwanted optical signal from the taper. The attenuator extends along one side of the taper, and includes one of a conductive structure, a doped structure and a refractive structure.

Abstract: Provided is a computer system and a computerized method to automatically generate the synthetic images that simulate the human activities in a particular environment. The program instructions are input in the form of the natural language. Particular columns are provided in the user interface to allow the user to select desired instruction elements from sets of limited candidates. The instruction elements form the program instructions. The system analyzes the program instructions to obtain the standard predetermined time evaluation codes of the instructions. Parameters not include in the input program instructions are generated automatically. Synthetic images are generated by using the input program instructions and the parameters obtained.