▎ 摘　　要

NOVELTY - The device has an input waveguide carrying the optical signal. The absorbing waveguide includes an absorbing component (28) and an assisting component (26), where the absorbing component is made of a high-loss material and the assisting component is made of a low-loss material. The absorbing waveguide defines a side surface area (22) compatibly dimensioned with the engagement side edge (18) of the elongated coupling section (16). The side surface area of the absorbing waveguide is connected side-by-side with the engagement side edge of the elongated coupling section along the length for tracking to evanescently couple the optical signal from the elongated coupling section to the laterally displaced absorbing component of the absorbing waveguide. USE - Device for evanescently coupling an optical signal to an absorbing waveguide of photodetectors such as lumped-element and traveling-wave photodetectors for use in communication and sensing applications in a fiber-optic system. Uses include but are not limited to a PIN photodiode, a PN photodiode, a Schottky barrier photodiode, a graphene photodetector, a Avalanche photodetector, and a phototransistor. ADVANTAGE - The optical power saturation threshold of light coupled from integrated input waveguides into waveguide photodetectors is increased, while also maintaining a small overall area to achieve high speed of operation. The device is convenient to use, relatively simple to manufacture and comparatively cost effective. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for evanescently coupling an optical signal to an absorbing waveguide. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of an absorbing component overlying the assisting component in a device for evanescently coupling an optical signal to an absorbing waveguide of photodetectors. 16Elongated coupling section 18Engagement side edge 22Side surface area 26Assisting component 28Absorbing component 30Propagating optical mode