Coherent Receiver Array On-Chip Interference
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Solution Overview
Problem
Current optical coherence tomography (OCT) systems require mechanical scanning and complex setups for high-resolution 3D imaging, limiting their efficiency and practicality for real-time applications like 3D video recording and space-division multiplexing communications.
Innovation Solution
An integrated coherent receiver array with on-chip free space interference using a substrate with photodetectors and partially reflective or splitting mirrors, allowing for simultaneous interference of optical and local oscillator signals, enabling high-sensitivity and axial resolution imaging without mechanical scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mechanical scanning is used in OCT systems, then high-resolution imaging can be achieved, but the system complexity and time consumption increase
Solution Approach 1:
The patent replaces mechanical scanning with on-chip free space optical interference using integrated mirrors and photodetectors. The mirrors perform beam splitting and interference in the optical domain, eliminating the need for mechanical movement while achieving high-resolution 3D imaging through coherent detection.
Solution Approach 2:
The patent transitions from temporal scanning to spatial interference by using multiple photodetectors arranged in an array with integrated mirrors. This allows simultaneous measurement of multiple depth positions through optical interference, converting a time-based process into a space-based parallel process.
2Measurement precision
If mechanical scanning is used in OCT systems, then imaging can be performed, but real-time applications are limited
Solution Approach 1:
The on-chip interference system enables continuous optical interference and detection without mechanical interruption. The integrated mirrors and photodetectors operate continuously to capture optical signals, enabling real-time 3D imaging and video recording applications.
Solution Approach 2:
By replacing mechanical scanning with integrated optical interference, the system eliminates movement-related delays and achieves real-time processing capability while maintaining high imaging resolution.
3Measurement precision
If complex setups are used in OCT systems, then high-resolution imaging is achieved, but ease of operation decreases
Solution Approach 1:
The patent merges multiple optical components (mirrors, photodetectors, and interference functionality) into a single integrated chip. This consolidation simplifies the overall system setup and operation while maintaining high axial resolution through coherent optical interference.
Solution Approach 2:
The integrated chip performs multiple functions including beam splitting, optical interference, and signal detection simultaneously. This multi-functionality reduces the need for separate components and simplifies system operation while achieving high-resolution imaging.
4Measurement precision
If large arrays are fabricated, then signal-to-noise ratio improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the receiver array into multiple identical photodetector units with integrated mirrors, each capable of independent operation. This segmentation allows for modular fabrication and assembly, reducing overall manufacturing complexity while enabling large array configurations for improved signal-to-noise ratio.
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
Enables high-resolution, real-time 3D imaging and efficient space-division multiplexing by integrating photodetectors and mirrors on a single chip for on-chip interference, simplifying the imaging process and allowing for large arrays to be fabricated, thus improving signal-to-noise ratio and reducing noise coupling.
Implementation Method 1
performing on-chip free space interference of an optical signal and a reference signal
Implementation Method 2
a plurality of photodetectors integrated on the substrate
Data Source
AI summary
Optical coherent receiver arrays are described. The optical coherent receiver arrays include an integrated array of photodetectors separated by integrated mirrors which may cause interference of received free space optical and local oscillator signals. The mirrors may serve as splitters, helping to align the received signal and local oscillator to cause interference. The photodetectors of the optical coherent receiver array may be electrically coupled in various manners to read out the signals. The optical coherent receiver array may be implemented in an optical coherence tomography (OCT) imaging system in some embodiments.