Microwave Photon Frequency Synthesis Using Optical Frequency Combs
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Solution Overview
Problem
Traditional microwave frequency synthesis technologies struggle to meet the requirements of next-generation electronic information systems for high frequency, high stability, and low phase noise due to limitations in quartz oscillators and dielectric resonant cavities, and existing microwave photonics technologies also fail to achieve the necessary phase noise and stability.
Innovation Solution
A microwave photon frequency synthesis system utilizing an optical frequency comb module, optical and electrical filtering and amplification modules, and optical amplitude and phase control to generate high-frequency, low-phase noise signals through various mode combinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electrical frequency multiplication is used to increase output frequency, then the frequency range is extended, but phase noise deteriorates logarithmically by 20 times
Solution Approach 1:
The patent replaces electrical frequency multiplication with optical frequency multiplication using a mode-locked laser and optical frequency comb. This substitution eliminates the 20x phase noise deterioration that occurs in electrical frequency multiplication, achieving both high frequency extension and low phase noise performance simultaneously.
Solution Approach 2:
The patent changes the operating domain from electrical to optical frequencies. By generating microwave signals through optical frequency comb and electro-optic modulation rather than electrical frequency multiplication, the system achieves high frequency output without the associated phase noise penalty, effectively changing the fundamental parameter of signal generation.
2Object-affected harmful factors
If quartz crystals and dielectric resonant cavities are used for frequency synthesis, then low phase noise is achieved, but frequency range and stability are limited
Solution Approach 1:
The patent replaces traditional quartz crystal and dielectric resonant cavity-based electrical oscillation with optical frequency comb and electro-optic modulation. This substitution enables the system to achieve both low phase noise and extended frequency range, overcoming the limitations of conventional microwave oscillators.
Solution Approach 2:
The patent transitions from electrical domain to optical domain for frequency generation. By using optical frequency comb and converting to microwave domain through electro-optic modulation, the system accesses a higher frequency dimension that provides both low phase noise and wide frequency range simultaneously.
3Object-affected harmful factors
If optical frequency comb is used for microwave signal generation, then phase noise is reduced to better than -170 dBc/Hz, but tuning mechanism limitations reduce stability
Solution Approach 1:
The patent introduces feedback control mechanisms through phase-locked loop (PLL) and frequency-locked loop (FLL) systems that continuously monitor and adjust the optical frequency comb. This feedback stabilizes the frequency output, compensating for tuning mechanism limitations and achieving high frequency stability while maintaining low phase noise.
Solution Approach 2:
The patent employs dynamic tuning mechanisms including electro-optic modulators and phase-locked loop control that can adaptively adjust frequency parameters in real-time. This dynamic control enables the system to maintain both low phase noise and high stability by continuously optimizing the operating conditions.
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 system provides flexible frequency synthesis with reduced phase noise and improved stability, enabling a wide range of bandwidths and frequencies suitable for advanced electronic systems.
Implementation Method 1
an optical frequency comb module, configured to generate a first optical signal
Implementation Method 2
configured to perform frequency multiplication or frequency division processing on a repetition frequency of the first optical signal to obtain and output a second optical signal
Implementation Method 3
an optical amplitude and phase control module, configured to perform amplitude and phase control on an input optical signal
Implementation Method 4
a photoelectric conversion module, configured to perform a photoelectric conversion of the input optical signal to obtain and output an electrical signal
Data Source
AI summary
The disclosure provides a microwave photon frequency synthesis system and method. In the disclosure, based on various combinations of path switching options of optical routing modules and electrical routing modules, the microwave photon frequency synthesis system is provided with a direct photoelectric conversion mode, an electrical frequency synthesis mode and an optical amplitude and phase control mode. The first optical signal frequency selection based on the optical frequency comb module and the frequency multiplication/division selection of the optical frequency multiplication/division module can be freely combined to realize frequency sources of various frequencies. Based on the optical frequency comb module to generate the first optical signal, and then combined with an electrical filtering module, phase noise can be reduced. The optical amplitude and phase may be controlled by the optical amplitude and phase control module.