Vectorial Optical Field Measurement Apparatus
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Solution Overview
Problem
Current optical communication technologies face challenges in increasing photon efficiency and information density, as well as maintaining data integrity when transmitting through turbid media.
Innovation Solution
The use of vectorial optical fields as information carriers, encoded in different vectorial modes and decoded using differential spatial phase decoders, which are robust against turbulence and maintain high photon efficiency by utilizing the vectorial mode degree of freedom of light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional optical communication protocols are used, then device complexity is low, but photon efficiency and information density are limited
Solution Approach 1:
The patent employs vectorial modes of light, which add spatial polarization dimensionality to traditional optical communication. By utilizing the full vectorial nature of light (both polarization and spatial mode), the system increases the information capacity per photon without proportionally increasing device complexity
Solution Approach 2:
The system changes the operational parameters from scalar intensity modulation to vectorial mode encoding. This involves manipulating multiple degrees of freedom simultaneously (polarization states, spatial modes), thereby increasing photon efficiency by extracting more information from each photon
2Reliability
If information is transmitted through turbid media, then communication range is extended, but data degradation occurs
Solution Approach 1:
The patent changes from transmitting simple intensity signals to transmitting vectorial mode structures. These vectorial modes are designed to be more resilient to turbulence, as their spatial polarization profiles maintain structural integrity better than traditional modulation schemes when propagating through turbulent media
Solution Approach 2:
The system pre-encodes information in vectorial modes that inherently possess robustness against turbulence. By preparing the optical field with specific vectorial characteristics before transmission, the system cushions against the degrading effects of turbulent media
3Quantity of substance
If high-dimensional communication protocols are implemented, then information density increases, but measurement and detection difficulty increases
Solution Approach 1:
The patent segments the complex vectorial field measurement into distinct components: polarization separation module divides the field into orthogonal polarization components, and spatial mode decomposition breaks down the spatial structure. This segmentation makes the high-dimensional measurement tractable by handling each dimension separately
Solution Approach 2:
The system introduces intermediate measurement steps using polarization separation and spatial filtering as mediators. These intermediaries transform the complex vectorial field into separable components that can be measured and detected more easily, bridging the gap between high-dimensional encoding and practical detection
Data Source
AI summary
An apparatus measures the transverse profile of vectorial optical field beams, including at least the directional intensity complex amplitude, the phase and the polarization spatial profile. The apparatus contains a polarization separation module, a weak perturbation module, and a detection module. Characterizing the transverse profile of vector fields provides an optical metrology tool for both fundamental studies of vectorial optical fields and a wide spectrum of applications, including microscopy, surveillance, imaging, communication, material processing, and laser trapping.