SPPs Tunable Optical Ring Filter for Resonance Control
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Solution Overview
Problem
Existing optical waveguide resonant ring filters struggle to simultaneously control resonance depth, resonance frequency, and filtering bandwidth, as structural parameters are fixed once the device is produced, limiting their tunability and increasing crosstalk and instability in active structures.
Innovation Solution
A tunable optical resonant ring filter using a Surface Plasmon Polaritons (SPPs) waveguide with a directional coupler and ring heaters, where metal nanometer wires and organic polymer dielectric materials allow for flexible control of resonance characteristics through electrical signals, enabling simultaneous adjustment of resonance depth, frequency, and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an optical waveguide resonant ring filter is used, then the device structure is simple and easy to manufacture, but the filtering bandwidth, resonance depth, and resonance frequency cannot be continuously tuned after production
Solution Approach 1:
The patent introduces active control mechanisms (thermal fields, electric fields, or optical fields) to dynamically adjust the resonance characteristics of the ring filter after fabrication. This allows the filtering bandwidth, resonance depth, and resonance frequency to be continuously tuned without changing the physical structure, resolving the contradiction between structural simplicity and operational flexibility.
Solution Approach 2:
The patent changes the operating parameters of the waveguide material (refractive index, absorption coefficient) through external fields (thermal, electric, or optical) to achieve continuous adjustment of resonance characteristics. This enables the filter to adapt different functions and demands while maintaining the simple waveguide structure.
2Adaptability or versatility
If an active optical waveguide resonant ring using Erbium-doped waveguide and pump light is used, then the resonance bandwidth can be tuned, but the device complexity increases and stability decreases due to requiring both pump light and signal light
Solution Approach 1:
The patent extracts the pump light requirement from the system by using passive waveguide materials with controllable loss characteristics. Instead of using Erbium-doped active waveguides that require pump light, the invention uses standard optical waveguides where the loss can be controlled through thermal or electric fields, thereby reducing device complexity and eliminating crosstalk issues.
Solution Approach 2:
The patent introduces thermal fields or electric fields as intermediaries to control the waveguide loss and resonance characteristics. These fields act as mediators that can adjust the resonance bandwidth without requiring direct optical pumping, thus simplifying the device structure and improving stability.
3Adaptability or versatility
If an active optical waveguide resonant ring filter is used, then the resonance bandwidth can be modulated, but the device stability decreases and crosstalk increases
Solution Approach 1:
The patent replaces the optical pumping mechanism with thermal or electric field control mechanisms. This substitution eliminates the need for high-power pump light, reducing optical crosstalk and improving device stability while maintaining the ability to modulate resonance bandwidth through controlled changes in waveguide loss.
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 SPPs waveguide filter achieves precise control over resonance depth, frequency, and bandwidth, enhancing stability and reducing crosstalk, with low insertion loss and the ability to modulate both optical and electrical signals, suitable for integrated optical and hybrid systems.
Implementation Method 1
SPPs are electromagnetic modes produced by interaction between light waves and migratory surface charges (e.g., free electrons in metal), which can achieve transmission in a waveguide made of metal and dielectric materials in a specific structure.
Implementation Method 2
the intra-ring transmission phase can be regulated by means of the thermo-optical properties or electro-optical properties of the optical waveguide material, so as to control the peak value position of resonance frequency
Implementation Method 3
a resonant ring mainly consists of an optical waveguide, and utilizes multiple-beam interferometry to produce a periodic transmitted spectrum and thereby forms a resonant ring filter
Data Source
AI summary
A surface-plasmon-polaritons (SPPs) tunable optical resonant ring filter that includes an SPPs waveguide, an SPPs tunable directional coupler, and an SPPs tunable resonant ring. The tunabilities of the resonant frequency, the resonant depth, and the filtering bandwidth are achieved by tuning the loss and transmission phase of the resonant ring and the coupling ratio of the directional coupler. Since the metal core layer of the SPPs waveguide is capable of multiplexing electro-optical signals, the SPPs tunable optical resonant ring filter can be used not only in an integrated optics system, but also in an integrated electro-optics hybrid system.