Non-classical Light Generation via Modal Phase Matching
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Solution Overview
Problem
Current methods for generating non-classical light using lithium niobate on insulator (LNOI) waveguides with quasi-phase matching (QPM) face challenges such as complexity in manufacture, sensitivity to fabrication imperfections, and limitations in tuning options, particularly in cryogenic environments, where temperature tuning is slow and may affect nearby optical circuitry.
Innovation Solution
The method involves converting classical light into non-classical light by using a non-fundamental propagation mode in the waveguide, eliminating the need for periodic poling and allowing for modal phase matching, which simplifies manufacture and enables electro-optic or piezo-optic tuning, suitable for cryogenic operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quasi-phase matching (QPM) with periodically poled lithium niobate is used to generate non-classical light, then the generation efficiency is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the periodic poling structure from the lithium niobate waveguide, replacing it with a uniformly poled structure. This removes the complex alternating polarity regions while maintaining the nonlinear optical properties needed for efficient non-classical light generation through spontaneous parametric down-conversion.
Solution Approach 2:
The patent changes the poling parameter from periodic (alternating polarity) to uniform (constant polarity along the waveguide). This parameter change simplifies the manufacturing process and reduces device complexity while still enabling efficient photon pair generation through the nonlinear optical effect in the lithium niobate material.
2Productivity
If periodically poled lithium niobate waveguides are used for non-classical light generation, then conversion efficiency is improved, but sensitivity to fabrication imperfections increases
Solution Approach 1:
The patent removes the periodic poling structure that creates sensitivity to fabrication errors. By using a uniformly poled waveguide instead of periodically poled, the system eliminates the critical dependence on precise periodicity, thereby reducing sensitivity to variations in waveguide geometry and poling accuracy.
Solution Approach 2:
The uniformly poled structure acts as a cushion against fabrication imperfections by providing a more robust design that does not rely on precise periodic features. The uniform structure inherently tolerates variations in waveguide dimensions and poling depth without significantly degrading the photon pair generation efficiency.
3Adaptability or versatility
If temperature tuning is used to adjust the non-classical light source, then wavelength tuning is achieved, but the tuning speed decreases and heat dissipation issues arise
Solution Approach 1:
The patent replaces the thermal tuning mechanism with electro-optic tuning using lithium niobate's electro-optic effect. This substitution eliminates the need for heat-based wavelength adjustment, enabling fast electrical control of the resonator's optical properties and achieving rapid wavelength tuning without thermal inertia or heat dissipation problems.
Solution Approach 2:
The patent changes the tuning parameter from temperature (thermal) to electric field (electrical). By applying voltage to the lithium niobate waveguide, the refractive index and resonant wavelength can be rapidly adjusted through the electro-optic effect, providing fast tuning response times suitable for dynamic applications.
4Productivity
If periodically poled lithium niobate is used for non-classical light generation, then generation efficiency is improved, but integration with optical switches becomes more difficult
Solution Approach 1:
The patent extracts and removes the periodic poling structure that creates incompatibility with optical switch integration. By using uniformly poled lithium niobate, the system eliminates the manufacturing conflicts between QPM waveguides and optical switches, enabling both functions to be integrated on the same chip without requiring different material layers or complex fabrication sequences.
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
This approach simplifies the manufacture of non-classical light generation devices, reduces sensitivity to fabrication errors, and allows for efficient conversion of classical light into non-classical light, particularly suitable for cryogenic applications by using modal phase matching and non-doped nonlinear optical materials.
Implementation Method 1
converting classical light into non-classical light by using a non-fundamental propagation mode in the waveguide
Implementation Method 2
allowing for modal phase matching, which simplifies manufacture and enables electro-optic or piezo-optic tuning
Implementation Method 3
enables electro-optic or piezo-optic tuning, suitable for cryogenic operations
Implementation Method 4
enables electro-optic or piezo-optic tuning, suitable for cryogenic operations
Data Source
Figure 1~2
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Figure 4
AI summary
A method for generating non-classical light from classical light, the method comprising the steps of: providing a non-classical light generation stage (3) comprising at least one waveguide (25), inputting classical light into the non-classical light generation stage (3), and converting in the non-classical light generation stage (3) at least part of the classical light into non-classical light. The classical light is in a non-fundamental propagation mode of a waveguide (25) of the non-classical light generation stage (3) and the non-classical light is in a fundamental propagation mode a waveguide (25) of the non-classical light generation stage (3). The converting does not involve quasi-phase-matching. The method further comprises the step of providing an input adaptation stage (2) for obtaining the classical light to be input into the non-classical light generation stage (3), wherein in the input adaptation stage (2) classical light is converted into classical light of a different waveguide propagation mode. And a system comprising a non-classical light generation stage (3) for converting classical light at least partly into non-classical light, and an optical switch and/or an optical phase shifter (38), the non-classical light generation stage (3) and the optical switch and/or optical phase shifter (38) being arranged on a single optical chip.