Optical Frequency Comb Stabilization for Terahertz Signal Generation
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Solution Overview
Problem
Conventional technologies struggle to generate high-frequency terahertz wave signals due to instability caused by temperature drift in laser output, leading to random fluctuations in signal frequency.
Innovation Solution
A signal generating method that performs cyclic electro-optic modulation on a first signal from a laser source to produce an optical frequency comb signal, which includes a target spectral component. This component is then filtered to obtain a high-power spectral component, allowing for the generation of a high-frequency terahertz wave signal through heterodyne beat frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If optical heterodyning method is used to generate millimeter wave or terahertz wave signal, then system structure becomes simple and costs reduce, but frequency stability deteriorates due to laser temperature drift
Solution Approach 1:
The patent employs periodic electro-optic modulation at specific frequencies to generate optical frequency comb signals. By using periodic modulation waves with carefully selected frequencies, the system generates stable spectral components that can be used for heterodyne detection, thereby achieving frequency stability despite laser temperature drift
Solution Approach 2:
The patent changes the modulation frequency parameter to generate different spectral components in the optical frequency comb. By adjusting the modulation frequency, the system can select specific spectral components that compensate for laser frequency drift, thus maintaining output signal stability while keeping the system structure simple
2Device complexity
If conventional optical heterodyning method is used, then system structure is simple, but frequency of generated signal becomes unstable and prone to random fluctuation
Solution Approach 1:
The patent implements a feedback mechanism where the optical frequency comb generation process continuously compensates for laser frequency drift. The periodic modulation creates spectral components that are sensitive to laser frequency changes, allowing the system to detect and compensate for drift, thus stabilizing the output signal frequency
Solution Approach 2:
The patent performs preliminary electro-optic modulation to generate the optical frequency comb signal before heterodyne detection. This preliminary action creates multiple spectral components that can be selectively used to compensate for frequency drift, ensuring stable output signals even when laser frequency varies due to temperature changes
3Reliability
If conventional technologies are used to improve optical heterodyning method, then frequency stability improves, but ability to generate high-frequency terahertz signal deteriorates
Solution Approach 1:
The patent creates a universal optical frequency comb generation method that can simultaneously provide multiple spectral components for different applications. The same periodic modulation mechanism works for both stabilizing frequency and generating high-frequency terahertz signals, making the system adaptable to various frequency requirements while maintaining stability
Solution Approach 2:
The patent transitions from direct electrical signal generation to optical domain processing by using electro-optic modulation. This dimensionality change to the optical domain enables access to much higher frequencies (terahertz range) while using periodic modulation to maintain frequency stability, thus resolving the contradiction between stability and high-frequency capability
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 effectively stabilizes the frequency of the terahertz wave signal, achieving a high-frequency output with improved stability and power, overcoming the limitations of conventional technologies.
Implementation Method 1
performing cyclic electro-optic modulation on a first signal to generate a first optical frequency comb signal
Implementation Method 2
performing first filtering processing on the first optical frequency comb signal to generate the target spectral component
Implementation Method 3
generating the target signal based on a heterodyne beat frequency of the first signal and the target spectral component
Data Source
AI summary
This application discloses a signal generating method, apparatus, and system. One example method includes: performing cyclic electro-optic modulation on a first signal to generate a first optical frequency comb signal, where the first signal is a signal output by a laser source, the first optical frequency comb signal includes a target spectral component, and a frequency of the target spectral component is equal to a sum of or a difference between a frequency of the first signal and a frequency of a target signal; performing first filtering processing on the first optical frequency comb signal to generate the target spectral component; and generating the target signal based on a heterodyne beat frequency of the first signal and the target spectral component.