Optical Synthesizer Frequency Range Expansion
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Solution Overview
Problem
Conventional optical synthesizers have a limited frequency range for generating signals, which restricts their application in high-frequency technical fields such as terahertz region applications.
Innovation Solution
An optical synthesizer comprising a laser source, an optical modulator, an optical comb generator, and optical filters that extract and combine frequency components to generate signals with high frequency resolution and wide frequency range, eliminating the need for phase locked loops and reducing phase synchronization loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical synthesizer uses a harmonic mixer for phase synchronization control, then phase synchronization can be maintained, but the frequency range of generated signals is limited
Solution Approach 1:
The patent segments the optical signal path into multiple independent channels: one channel generates frequency components through optical modulation, another generates an optical comb, and these are combined at a photomixer. This segmentation allows each channel to operate independently, expanding the overall frequency range without requiring complex phase-locked loop control across the entire system.
Solution Approach 2:
The patent employs a single laser source that serves multiple functions: it provides the fundamental frequency for optical modulation, generates the optical comb through non-linear optical processes, and serves as the reference for both frequency components. This multi-functionality eliminates the need for multiple laser sources and complex synchronization mechanisms, thereby expanding frequency range while reducing device complexity.
2Adaptability or versatility
If signals are generated using multiplication techniques, then frequency conversion is achieved, but spurious components are introduced
Solution Approach 1:
The patent replaces traditional electronic multiplication techniques with optical frequency comb generation and optical mixing. The optical comb provides equally spaced frequency lines that can be selectively combined, and the optical mixing process occurs in the optical domain before detection, which inherently suppresses spurious components that would otherwise be generated in electronic multiplication circuits.
Solution Approach 2:
The patent introduces an optical frequency comb as an intermediary between the laser source and the final frequency conversion. The comb structure provides a clean, evenly-spaced frequency spectrum that acts as a mediator, allowing precise frequency selection and combination without introducing the spurious components associated with direct electronic multiplication and mixing.
3Measurement precision
If the frequency interval of the optical comb is small, then high frequency resolution is achieved, but the device complexity increases
Solution Approach 1:
The patent achieves high frequency resolution by changing the parameters of the optical comb generation process, specifically by controlling the driving signal frequency and the non-linear optical conversion efficiency. By adjusting these parameters, the frequency interval between comb lines can be made small without requiring additional complex components, as the resolution is determined by the driving signal characteristics rather than the physical structure of the comb generator.
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 the generation of signals with high frequency resolution over a wide frequency range from low frequencies to terahertz, reducing spurious components and facilitating seamless frequency control without requiring multiplication techniques.
Implementation Method 1
an optical modulator that modulates a frequency of the laser based on a variable input signal to output a light including a first frequency component
Implementation Method 2
an optical comb generator that generates an optical comb based on the laser and a predetermined driving signal
Implementation Method 3
an optical-electric converter that outputs an electric signal based on a frequency difference between the first and second frequency components
Data Source
AI summary
In an optical synthesizer, a laser source outputs a laser. An optical modulator modulates the frequency of the laser to output a light including a first frequency component. An optical filter extracts the first frequency component from the output of the optical modulator. An optical comb generator generates an optical comb based on the laser and a predetermined driving signal. A variable-wavelength narrowband filter extracts a second frequency component from the optical comb. An optical-electric converter outputs an electric signal based on the frequency difference between the first and second frequency components.