Rotatable Optical Resonator for Flexible Signal Demodulation
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Solution Overview
Problem
Conventional optical demodulation methods are either complex and expensive or limited in flexibility, particularly in fiber-based and short-range free-space optical communications, due to fixed data rates and modulation formats.
Innovation Solution
A passive modulation approach using a rotatable optical cavity resonator, such as an etalon, to dynamically adjust its operating condition based on the angle of arrival of optical signals, allowing for variable data rates and different modulation formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional demodulation methods using local oscillators are used, then demodulation capability is achieved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the local oscillator component from the demodulation system. By using a passive optical resonator that naturally provides the reference signal through its resonance characteristics, the complex active local oscillator is removed, simplifying the device while maintaining demodulation capability
Solution Approach 2:
The optical resonator serves itself by generating the reference signal through its own resonance properties. The resonator's natural oscillation at specific frequencies provides the reference needed for demodulation without requiring an external active oscillator, reducing system complexity
2Ease of manufacture
If fixed demodulation systems are used, then manufacturing simplicity is maintained, but adaptability to different data rates and modulation formats deteriorates
Solution Approach 1:
The patent introduces dynamic tuning capability to the optical resonator through mechanical adjustment mechanisms. This allows the resonator's resonance frequency to be dynamically adjusted to match different incoming signal frequencies, enabling adaptation to various data rates and modulation formats while maintaining a relatively simple manufacturing base
Solution Approach 2:
The system changes the physical parameters of the optical resonator (such as cavity length or refractive index) to adjust its resonance characteristics. By modifying these parameters, the demodulator can adapt to different operating conditions and signal types without requiring complete system redesign
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
Provides a flexible and low-cost solution capable of demodulating optical signals with variable data rates and modulation formats, suitable for fiber-based and short-range free-space optical communications.
Implementation Method 1
an optical resonator, such as a Fabry-Perot etalon, an optical delay line, or other bulk optical cavity that accumulates energy, as a modulation converter
Implementation Method 2
The arriving optical signals may be phase modulated, amplitude modulated, or frequency modulated, and the optical resonator assembly converts the received phase, amplitude, and/or frequency modulated optical signal into a directly detectable intensity modulated output signal
Data Source
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AI summary
Apparatus, systems, and methods include leveraging the angular dependence of the angle of arrival of the incoming optical signal at an optical resonator of an optical receiver and the output response signal to adjust the operating condition of the optical resonator. The optical resonator is dynamically tuned by rotating the optical resonator to optimize signal-to-noise ratio or other parameters for different modulation formats of the incoming optical signal or other different operating conditions.