LiDAR DEVICES HAVING HIGH OPTICAL EFFICIENCY AND METHODS OF MANUFACTURING THE SAME

Smart overview of the Invention

The patent application discusses a LiDAR (Light Detection and Ranging) device that features a photonics chip designed to enhance optical efficiency. This chip includes an optical emitter that directs modulated light toward an object and an optical receiver that captures the light reflected from the object. A key component is the light mixing layer situated between the photonics chip and the optical receiver, which combines the incident light with local oscillator light to improve performance.

Background

The development of silicon photonics-based LiDAR systems aims to improve optical efficiency, which is crucial for determining the optical power from a transmitter. Lower optical efficiency can reduce the detectable distance, and while high-powered lasers can be used, they are costly and complex. Therefore, enhancing the optical efficiency of photonics chips remains a significant focus in research to make LiDAR systems more effective and accessible.

Technical Details

The LiDAR device employs a light mixing layer, which may include elements such as a beam splitter or waveguide, to effectively mix the incoming light with local oscillator light. This layer can incorporate materials transparent to infrared rays and structures that diffuse the light. The optical emitter consists of multiple pixels, each with light-emitting elements like grating couplers, to facilitate precise light emission and reception.

Manufacturing Process

A method for manufacturing the LiDAR device involves forming a photonics chip with an optical emitter, creating an optical receiver, and establishing a light mixing layer to blend the incoming light with local oscillator light. The photonics chip and optical receiver are attached on either side of the light mixing layer, ensuring efficient light processing and enhanced device functionality.

Applications and Modifications

The described LiDAR device is versatile, capable of gathering information about both stationary and mobile objects, including vehicles, buildings, and natural elements. The design allows for various modifications, such as altering the materials or configurations of the optical components, to cater to different functional requirements or improve specific performance aspects.