Optical Resonator Phase Demodulation
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Solution Overview
Problem
Phase modulation receivers are complex, large, and costly due to the need for local oscillators, Fiber Bragg Gratings, or delay line interferometers, which require stable lasers and sophisticated optics, limiting their flexibility and scalability.
Innovation Solution
The use of an optical resonator, such as a Fabry-Perot filter or etalon, that converts phase-encoded optical signals into intensity-encoded signals without a coherent clock source, allowing for simplified detection of phase transitions and modulation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If phase modulation receivers use local oscillators, Fiber Bragg Gratings, and delay line interferometers, then demodulation capability is achieved, but device complexity and size increase significantly
Solution Approach 1:
The patent changes the operational parameters of the optical resonator, specifically tuning its resonant frequency to match the optical carrier wavelength. This parameter adjustment allows the resonator to convert phase-modulated signals into intensity-modulated signals without requiring complex demodulation hardware, thereby reducing device complexity while maintaining demodulation capability
Solution Approach 2:
The patent replaces the mechanical/optical complex system (local oscillators, Fiber Bragg Gratings, delay line interferometers) with a simpler optical resonator system. The resonator uses optical feedback and resonance principles to achieve signal conversion, substituting complex mechanical demodulation components with a more compact optical resonance mechanism
2Measurement precision
If stable lasers and sophisticated optics are used in phase modulation receivers, then signal detection accuracy is improved, but system cost and weight increase
Solution Approach 1:
The patent extracts and eliminates unnecessary components from the traditional phase modulation receiver system. By removing local oscillators, Fiber Bragg Gratings, and delay line interferometers, the system achieves signal detection using only the optical resonator and basic detection components, significantly reducing system weight while maintaining detection accuracy through resonant signal enhancement
Solution Approach 2:
The patent replaces expensive, sophisticated optical components with simpler, more cost-effective alternatives. The optical resonator uses basic optical elements that are cheaper and lighter than traditional demodulation components, achieving comparable or superior performance through resonant amplification rather than complex component assemblies
3Productivity
If traditional phase modulation receivers are designed for specific modulation rates, then optimization for that rate is achieved, but adaptability to various encoding techniques is reduced
Solution Approach 1:
The patent designs the optical resonator to serve multiple functions across different modulation rates and encoding techniques. By tuning the resonator's quality factor and resonant frequency, the same basic structure can accommodate various modulation formats (PSK, QPSK, etc.) and data rates without requiring redesign, achieving both optimization and adaptability
Solution Approach 2:
The patent introduces dynamic tuning capabilities to the optical resonator, allowing its resonant characteristics to be adjusted in real-time. This dynamic adjustment enables the system to optimize performance for different modulation rates and encoding techniques by changing the resonator's operational parameters rather than requiring fixed-rate hardware
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 significantly reduces system size, weight, and cost while providing flexibility across various modulation rates and encoding techniques, enabling efficient demodulation of phase-encoded optical signals without the need for complex optical components.
Implementation Method 1
accumulate resonant optical signal energy inside the optical resonator
Implementation Method 2
converting a received phase-encoded optical signal into an intensity-encoded optical signal
Implementation Method 3
reflecting a portion of optical signal energy impinging upon each of the semi-reflective surfaces
Data Source
AI summary
Optical signal receivers and methods are provided that include an optical resonator that allows optical signal energy to enter and accumulate inside the optical resonator. A portion of optical signal energy is emitted from the optical resonator at an output, such that the emitted optical signal energy is disturbed when a transition occurs in the received optical signal energy. A detector aligned with the output detects the emitted optical signal energy and is configured to detect the disturbance to the emitted optical signal energy and determine a characteristic of the transition in the received optical signal energy based upon the disturbance.