Electro-Optical Waveguide Tuning for Real-Time Dispersive Wave Scanning
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Solution Overview
Problem
Existing supercontinuum technologies face limitations due to fixed dispersion profiles in waveguides, which restrict the ability to scan various wavelength bands in real time without replacing the waveguide or altering the laser's wavelength band.
Innovation Solution
An electro-optical device comprising a waveguide and a wavelength modulator that absorbs incident light, allowing for active control of the dispersive wave's center wavelength by changing the absorption rate of the wavelength modulator based on applied voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a waveguide with fixed dispersion profile is used, then the structure is simple and stable, but the wavelength band of dispersive wave is limited to specific narrow bands
Solution Approach 1:
The waveguide dispersion profile is transformed from a fixed static structure to a dynamically adjustable one by integrating a wavelength modulator. The modulator changes the effective refractive index of the waveguide in real-time, enabling the dispersion profile to be dynamically tuned to generate dispersive waves across different wavelength bands without physical waveguide replacement
Solution Approach 2:
The invention changes the dispersion parameters of the waveguide by controlling the absorption characteristics of the wavelength modulator. By adjusting the pump light wavelength and power, the modulator's absorption rate changes, which modifies the effective refractive index and thereby tunes the dispersion profile to achieve desired wavelength band coverage
2Adaptability or versatility
If the waveguide is replaced to scan various wavelength bands, then the wavelength coverage is improved, but the operation complexity and time consumption increase
Solution Approach 1:
The mechanical replacement of waveguides is replaced by an optical/electrical control system. Instead of physically swapping waveguide components, the invention uses a wavelength modulator controlled by electrical signals to tune the dispersion profile, enabling rapid wavelength band scanning without mechanical intervention
Solution Approach 2:
The system enables dynamic wavelength band scanning by real-time adjustment of the modulator's absorption characteristics through electrical control of pump light parameters, allowing the waveguide to adaptively generate dispersive waves in different wavelength bands on-demand
3Illumination intensity
If a light source in narrow wavelength band is used, then the intensity per unit wavelength is large, but the wavelength band is narrow and cannot cover all bands
Solution Approach 1:
The waveguide system is designed to perform multiple functions by generating dispersive waves in different wavelength bands through a single device. By tuning the wavelength modulator, the same waveguide can produce high-intensity dispersive waves across multiple wavelength bands, eliminating the need for multiple specialized light sources
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
Enables real-time control of the wavelength band of the dispersive wave, allowing for scanning and measurement of various wavelength bands without replacing the waveguide or altering the laser's settings, thus enhancing the flexibility and efficiency of supercontinuum applications.
Implementation Method 1
a wavelength modulator disposed along the waveguide and configured to absorb the incident wave propagating through the waveguide
Implementation Method 2
The Fermi level of the electro-optical material may change according to a voltage applied through the electrodes
Implementation Method 3
An absorption rate at which the wavelength modulator absorbs the incident wave may change according to the Fermi level of the electro-optical material
Implementation Method 4
The waveguide may be configured to generate a dispersive wave by using a nonlinear process based on the dispersion profile of the waveguide
Implementation Method 5
The nonlinear process may include a soliton fission process
Data Source
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Figure 1C
AI summary
Provided are an electro-optical device, a laser device, and an electro-optical dual-comb generator. The electro-optical device includes a waveguide configured to generate a dispersive wave of which a center wavelength is different from a center wavelength of the incident wave of the waveguide, and a wavelength modulator disposed along the waveguide and configured to absorb the incident wave propagating through the waveguide, wherein, as the wavelength modulator absorbs the incident wave, the center wavelength of the dispersive wave changes.