Phase Difference Distribution Estimation for Optical Wavefront Shaping
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Solution Overview
Problem
When shaping a wavefront of an optical signal, timing errors can occur due to differences between the detection and shaping processes, and atmospheric fluctuations with varying movement speeds complicate the estimation of phase differences.
Innovation Solution
A method and device for estimating the phase difference distribution of a wavefront by calculating characteristic values related to the atmosphere through which the optical signal propagates, and using these values to control the phase of the optical signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If wavefront shaping is performed using detected wavefront, then wavefront shaping accuracy is improved, but timing error occurs due to delay between detection and shaping
Solution Approach 1:
The patent calculates characteristic values of atmospheric layers in advance (before wavefront shaping is needed) and uses these pre-calculated values to estimate the phase difference distribution at the actual shaping moment. This preliminary calculation of atmospheric characteristics allows the system to compensate for the time delay between detection and shaping by predicting the future wavefront state based on current atmospheric conditions.
2Productivity
If optical signal is transmitted through atmosphere, then communication is enabled, but signal intensity is significantly attenuated due to atmospheric fluctuation
Solution Approach 1:
The patent performs preliminary compensation processing on the optical signal before transmission by calculating characteristic values of atmospheric layers and using these to pre-distort the transmitted signal. This advance preparation counteracts the expected atmospheric attenuation and fluctuation, enabling the signal to maintain its intensity and quality after passing through the turbulent atmosphere.
Solution Approach 2:
The patent uses feedback from detected wavefronts and calculated atmospheric characteristic values to continuously adjust and optimize the transmitted optical signal. By monitoring the actual atmospheric conditions and using this information to modify subsequent transmissions, the system compensates for signal attenuation and maintains communication quality despite atmospheric fluctuations.
3Measurement precision
If phase difference estimation is performed using detected wavefront, then wavefront control accuracy is improved, but estimation becomes difficult due to multiple atmospheric layers with different movement speeds
Solution Approach 1:
The patent divides the complex atmosphere into multiple distinct layers, each characterized by specific movement speeds and optical properties. By segmenting the atmosphere in this way, the system can calculate characteristic values for each layer separately and combine these to estimate the overall phase difference distribution, making the complex estimation problem tractable despite the varying movement speeds of different atmospheric layers.
Data Source
AI summary
A phase difference distribution estimation method includes: receiving an optical signal via a space and detecting a phase of the optical signal; calculating characteristic values related to characteristics of the atmosphere through which the optical signal propagates from the optical signal received in the receiving; estimating a phase difference distribution of an optical signal received after a certain period of time, on the basis of the characteristic values calculated in the calculating; and controlling a phase of an optical signal in the receiving on the basis of the phase difference distribution estimated in the estimating.