Reconfigurable Optical Grating Coupler with Tunable Material
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Solution Overview
Problem
Current fiber optic network infrastructure faces challenges in handling increased data volumes and improving system performance due to limited bandwidth and the need for reduced physical size of photonics chip components.
Innovation Solution
A reconfigurable optical grating/coupler device is developed, featuring a lower waveguide structure and an upper body structure with grating elements made of tunable material whose index of refraction can be changed by energy application, allowing the device to function as either an optical grating or a coupler between photonic waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional optical grating structures are used, then light coupling function is provided, but the physical size cannot be reduced and bandwidth is limited
Solution Approach 1:
The patent applies the dynamics principle by making the grating structure reconfigurable through phase change material (PCM). The grating can dynamically switch between different coupling configurations (grating coupler mode and direct coupler mode) by changing the state of the PCM, enabling the system to adapt to different bandwidth requirements while maintaining a compact form factor.
Solution Approach 2:
The patent utilizes parameter changes by employing phase change material that can alter its optical properties (refractive index) between amorphous and crystalline states. This parameter change allows the grating structure to transform its coupling characteristics, thereby expanding bandwidth capability without increasing physical size.
2Adaptability or versatility
If fixed optical components are used, then manufacturing is simplified, but reconfigurability and adaptability are limited
Solution Approach 1:
The patent applies composite materials by integrating phase change material with the grating structure. This composite approach enables reconfigurability while maintaining compatibility with standard semiconductor manufacturing processes, as the PCM can be deposited using conventional techniques alongside other photonic components.
Solution Approach 2:
The patent implements universality by designing a single grating structure that can perform multiple functions: operating as a grating coupler in one state and as a direct coupler in another state. This multi-functionality is achieved through the phase change material's ability to alter optical properties, providing adaptability without requiring multiple separate components.
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 reconfigurable optical grating/coupler enhances bandwidth and system performance by enabling tunable light coupling and transmission between different photonic waveguides, improving data handling capacity and reducing physical size constraints.
Implementation Method 1
a grating structure in the upper body structure, wherein the grating structure comprises a plurality of grating elements that comprise a tunable material whose index of refraction may be changed by application of energy to the tunable material
Data Source
AI summary
One illustrative device disclosed herein includes a lower waveguide structure and an upper body structure positioned above at least a portion of the lower waveguide structure. In this example, the device also includes a grating structure positioned in the upper body structure, wherein the grating structure comprises a plurality of grating elements that comprise a tunable material whose index of refraction may be changed by application of energy to the tunable material.