Tunable Edge Coupler for Mode Matching in Photonic Chips
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Solution Overview
Problem
Conventional edge couplers in photonics chips have a fixed mode size, leading to inefficiencies in optical coupling due to mismatched mode sizes and manufacturing imperfections, resulting in significant coupling loss and limited compatibility with optical fibers of different modes.
Innovation Solution
A tunable edge coupler with a waveguide core made of a material that changes refractive index in response to an applied stimulus, allowing for adjustable mode matching with optical fibers of varying modes by using a tapered section with a reversible refractive index change, enabling efficient butt-end light coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional edge coupler with a fixed mode size is used, then the structure is simple and easy to manufacture, but the coupling efficiency deteriorates due to mismatched mode sizes and manufacturing imperfections
Solution Approach 1:
The patent applies the dynamics principle by making the waveguide core material tunable through an applied stimulus, allowing the refractive index to change dynamically. This enables the edge coupler to adapt its mode size in response to different optical fibers, thereby reducing coupling loss while maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the refractive index parameter of the waveguide core material in response to an applied stimulus. This parameter change allows the mode size of the waveguide to be adjusted, improving mode matching with different optical fibers and reducing coupling loss without complicating the manufacturing process.
2Ease of manufacture
If a conventional edge coupler with a fixed mode size is used, then the manufacturing process is simple, but the adaptability to different optical fibers deteriorates
Solution Approach 1:
The patent makes the edge coupler dynamic by enabling the waveguide core material to change its refractive index in response to an applied stimulus. This dynamic property allows the same manufactured structure to adapt to different optical fiber modes, significantly improving versatility while keeping the manufacturing process simple.
Solution Approach 2:
The patent utilizes parameter changes in the refractive index of the waveguide core material to achieve adaptability. By changing this physical parameter in response to external stimuli, the edge coupler can accommodate different optical fiber modes without requiring complex manufacturing variations.
3Device complexity
If the mode size of the edge coupler is fixed, then the structural complexity is low, but the coupling efficiency with different optical fibers deteriorates
Solution Approach 1:
The patent introduces dynamic capability to the edge coupler through tunable waveguide core material that responds to applied stimuli. This allows the mode size to be adjusted for optimal coupling efficiency with different optical fibers without significantly increasing structural complexity, as the tuning mechanism operates at the material level rather than requiring complex geometric variations.
Solution Approach 2:
The patent achieves improved coupling efficiency by changing the refractive index parameter of the waveguide core material in response to external stimuli. This parameter change enables the same simple structure to optimize its mode size for different optical fibers, maintaining low device complexity while improving productivity.
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 tunable edge coupler enhances mode matching and light coupling efficiency by adapting to different fiber modes, reducing coupling loss and improving compatibility with various optical fibers.
Implementation Method 1
The waveguide core is comprised of a material having a first state with a first refractive index in response to an applied stimulus and a second state with a second refractive index different from the first refractive index
Data Source
AI summary
Structures including an edge coupler and methods of fabricating a structure including an edge coupler. The edge coupler includes a waveguide core having an end surface that terminates proximate to an edge of a substrate. The waveguide core contains a material having a first state with a first refractive index in response to an applied stimulus and a second state with a second refractive index different from the first refractive index.