Multi-path Optical Interferometer Phase Extraction via Reference Signal
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Solution Overview
Problem
Current multi-path optical interferometers face challenges in achieving precise and unambiguous phase extraction due to low phase sensitivity and increased noise sensitivity, limiting their applications in optical metrology and quantum technologies, with existing methods being application-specific, complex, and prone to phase ambiguity.
Innovation Solution
A system and method for phase extraction in multi-path interferometers involving a light source with a coherence length longer than the arm length difference, using polarization and frequency multiplexing to generate a reference signal, and detecting frequency-shifted and unshifted output signals to determine the interferometer phase, allowing for scalable and accurate phase determination without phase ambiguity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-path interferometers are used to increase phase sensitivity, then phase sensitivity is improved, but noise sensitivity increases making precise measurement more difficult
Solution Approach 1:
The patent introduces a reference signal as an intermediary that interferes with the multi-path signals. This reference signal serves as a mediator that carries phase information without being subject to the same noise accumulation, enabling accurate phase extraction despite the increased noise sensitivity of multi-path interferometers
Solution Approach 2:
The system implements feedback by using the extracted phase information from the reference signal interference to actively stabilize and control the interferometer paths. This feedback mechanism compensates for noise-induced phase drift, maintaining measurement precision despite the inherently higher noise sensitivity of multi-path configurations
2Measurement precision
If existing phase extraction methods are used for multi-path interferometers, then phase extraction is achieved, but phase ambiguity occurs and methods are application-specific
Solution Approach 1:
The patent creates a universal phase extraction method that works across different multi-path interferometer configurations (N≥2 paths) and applications. The approach using reference signal interference and polarization multiplexing is not limited to specific applications but can be generally applied to any multi-path interferometer, eliminating the need for application-specific algorithms
Solution Approach 2:
The method extracts phase information by separating it into a distinct reference signal component that can be independently processed. By extracting the phase information through reference signal interference rather than direct multi-path analysis, the system eliminates phase ambiguity and creates a universally applicable extraction method
3Productivity
If complex algorithms with deconvolutions are used for phase extraction, then instantaneous phase extraction is achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex computational algorithms (deconvolutions) with a simpler optical-mechanical approach using reference signal interference and polarization multiplexing. The phase information is encoded directly into the reference signal, allowing extraction through simpler detection methods rather than requiring complex real-time computational deconvolution algorithms
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 method achieves accurate phase extraction with less than 1.5% average error, is scalable for N≥2 paths, and provides instantaneous phase mapping between 0 to 2π, overcoming phase ambiguity and complexity issues of existing methods.
Implementation Method 1
a light source with a coherence length longer than the arm length difference
Implementation Method 2
based on the interference between two or more optical waves
Implementation Method 3
using polarization and frequency multiplexing to generate a reference signal
Data Source
AI summary
A system and a method for phase extraction of a multi-path interferometer, the method comprising generating a reference signal of a coherence length longer than an arm length difference of the multi-path interferometer; splitting the reference signal into a frequency shifted reference signal and an unshifted reference signal; recombining the frequency shifted reference signal and the unshifted reference signal into a polarization- and frequency-multiplexed reference signal, and feeding the polarization- and frequency-multiplexed reference signal to the multi-path interferometer; detecting frequency shifted and unshifted output signals of the multi-path interferometer; and determining the interferometer phase from the detected signal.