Photonic Wavefront Phase Control for Compact Adaptive Optics
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Solution Overview
Problem
Current adaptive optic systems for correcting wavefront errors in optical systems are bulky, costly, and require precise alignment, with limited bandwidth, making them unsuitable for applications in turbulent or non-uniform transmission media.
Innovation Solution
A photonic integrated circuit-based system that integrates wavefront sensors and phase modulators to measure and correct wavefront errors, reducing the need for separate components and enabling higher bandwidth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adaptive optic systems are used to correct wavefront errors, then wavefront correction capability is achieved, but the system becomes bulky, costly, and requires precise alignment
Solution Approach 1:
The patent combines wavefront sensing and phase modulation functions into a single integrated photonic device. The microlens array is integrated with phase modulators in the same photonic integrated circuit, eliminating the need for separate adaptive optic components and their complex mechanical alignment. This integration directly resolves the contradiction by maintaining wavefront correction capability while dramatically reducing device complexity and bulkiness.
Solution Approach 2:
The patent replaces mechanical adaptive optic systems with a photonic integrated circuit-based system. Instead of using mechanical deformable mirrors or moving parts for wavefront correction, the invention uses electrically controlled phase modulators within the photonic circuit to achieve wavefront error correction. This substitution eliminates mechanical complexity and alignment requirements while maintaining correction functionality.
2Reliability
If conventional adaptive optic systems are used, then wavefront errors can be corrected, but the bandwidth is limited
Solution Approach 1:
The patent replaces bandwidth-limited mechanical adaptive optic systems with a photonic integrated circuit system that uses electrical signals for phase control. The phase modulators in the photonic circuit can respond much faster than mechanical systems, enabling high-bandwidth operation while maintaining wavefront correction capability. This directly resolves the contradiction between correction reliability and operational bandwidth.
3Adaptability or versatility
If separate wavefront sensors and phase modulators are used, then wavefront measurement and correction functions are achieved, but the system becomes bulky and requires precise alignment
Solution Approach 1:
The patent merges wavefront sensing and phase modulation functions into a single integrated photonic device. The microlens array serves dual purposes: focusing incoming light for wavefront sensing and directing light to phase modulators for correction. This integration maintains full wavefront measurement and correction functionality while eliminating the need for separate components and their complex alignment, directly resolving the contradiction.
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 solution provides compact, cost-effective wavefront correction with improved bandwidth, enabling near diffraction-limited images and enhanced transmission link efficiencies in turbulent environments.
Implementation Method 1
a phase modulator configured to adjust a phase of the portion of the optical energy transported over the signal pathway
Implementation Method 2
multiple wavefront sensors configured to measure wavefront errors in the portions of the optical energy
Implementation Method 3
the first antenna element is configured to receive a portion of optical energy
Implementation Method 4
the second antenna element is configured to transmit the portion of the optical energy
Data Source
AI summary
An apparatus includes a photonic integrated circuit having multiple cells. Each cell includes first and second antenna elements, where the first antenna element is configured to receive a portion of optical energy and the second antenna element is configured to transmit the portion of the optical energy. Each cell also includes a signal pathway configured to transport the portion of the optical energy between the first and second antenna elements. Each cell further includes a phase modulator configured to adjust a phase of the portion of the optical energy transported over the signal pathway. The apparatus also includes multiple wavefront sensors configured to measure wavefront errors in the portions of the optical energy. The apparatus further includes multiple phase controllers configured to adjust operation of the phase modulators in order to at least partially reduce the wavefront errors.