SOA Array and U-Turn Chip Layout for Compact FMCW LiDAR
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Solution Overview
Problem
Conventional LiDAR systems are bulky, costly, and unreliable due to their use of mechanical moving parts and bulk optical lens elements, which limits their effectiveness in applications such as automotive systems.
Innovation Solution
A photonic integrated circuit (PIC) assembly featuring a semiconductor optical amplifier (SOA) array and a U-turn chip, where the SOA array includes an input SOA and multiple SOAs arranged parallel to each other, and the U-turn chip includes an optical splitter and waveguide assembly to divide and redirect amplified light for parallel propagation, facilitating the integration and packaging of the SOA module with the PIC chip in a frequency modulated continuous wave (FMCW) LiDAR system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LiDAR systems use mechanical moving parts and bulk optical lens elements to steer laser beams, then beam steering function is achieved, but the system becomes bulky, costly, and unreliable
Solution Approach 1:
The patent replaces mechanical moving parts with a photonic integrated circuit that uses optical waveguides and phase modulators to steer laser beams. The beam steering function is achieved through electronic control of optical paths rather than mechanical movement, eliminating moving parts and bulk optical lens elements while improving reliability and reducing system complexity
Solution Approach 2:
The patent integrates multiple functional components (laser source, modulators, waveguides, detectors) into a single photonic integrated circuit chip. This merging of components eliminates the need for separate mechanical assemblies and bulk optical elements, resulting in a compact, reliable system with reduced complexity
2Adaptability or versatility
If conventional LiDAR systems use mechanical moving parts and bulk optical lens elements, then beam steering capability is provided, but the system size and cost increase
Solution Approach 1:
The patent replaces mechanical beam steering mechanisms with a photonic integrated circuit that uses electronically controlled optical waveguides and phase modulators. This substitution enables beam steering capability while dramatically reducing system volume by eliminating bulky mechanical components and large optical lens elements
Solution Approach 2:
The patent transitions from three-dimensional mechanical beam steering components to a planar photonic integrated circuit architecture. The optical paths are routed in two dimensions within the chip plane, enabling compact integration while maintaining full beam steering functionality through phased array control
3Ease of manufacture
If conventional LiDAR systems use mechanical moving parts and bulk optical lens elements, then optical beam control is achieved, but manufacturing cost and system bulk increase
Solution Approach 1:
The patent combines multiple discrete optical components into a single integrated photonic chip manufactured using standard semiconductor fabrication processes. This integration eliminates the need for complex assembly of bulk optical lens elements and mechanical parts, significantly improving manufacturing efficiency and reducing costs
Solution Approach 2:
The patent replaces mechanical optical control systems with an integrated photonic circuit that uses electronic control signals to manipulate light. This substitution enables manufacturing using established semiconductor industry techniques, improving ease of manufacture while reducing device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The PIC assembly enables compact, reliable, and cost-effective LiDAR systems by eliminating the need for bulk optical lens elements and mechanical moving parts, allowing for direct measurement of range and velocity through frequency modulation, while improving manufacturing efficiency and reducing packaging costs.
Implementation Method 1
The input SOA and the plurality of SOAs are arranged parallel to one another. The optical splitter is configured to receive amplified input light propagating in a first direction from the input SOA
Implementation Method 2
The waveguide assembly is configured to guide each of the plurality of beams to a corresponding SOA of the plurality of SOAs. The waveguide assembly also adjusts a direction of propagation of each of the guided beams to be substantially parallel to a second direction that is substantially opposite the first direction
Implementation Method 3
The optical splitter is configured to receive amplified input light propagating in a first direction from the input SOA, and divide the amplified light into a plurality of beams
Data Source
AI summary
A photonic integrated circuit (PIC) assembly comprising a semiconductor optical amplifier (SOA) array and a U-turn chip. The SOA array includes an input SOA and a plurality of SOAs. The input SOA and the plurality of SOAs are arranged parallel to one another. The U-turn chip includes an optical splitter and a waveguide assembly. The optical splitter is configured to receive amplified input light propagating in a first direction from the input SOA, and divide the amplified light into beams. The waveguide assembly guides the beams to a corresponding SOA of the plurality of SOAs, and adjusts a direction of prorogation of each of the guided beams to be substantially parallel to a second direction that is substantially opposite the first direction.