Heterodyne RF/Optical Links Utilizing Integrated Photonics

A program of research and development has been directed toward the goals of demonstrating (1) ultra-low-noise communication links in which information is conveyed by phase-modulated radio-frequency (RF) carrier signals that are, in turn, used to modulate laser-generated optical carrier signals and (2) implementation of transmitters and receivers in such links by means of several key integrated optoelectronic and photonic components. Notably, the scheme for integrating these components is based on the use of asymmetric twin optical waveguides (see figure) that afford design versatility in that they enable the use of a broad range of components useful in RF/photonic applications.