Tunable Superstructure Fiber Grating via Deformable Slides
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Solution Overview
Problem
Existing methods for tuning optical fiber gratings are limited in their ability to dynamically change the refractive index perturbation profile from one structure to another, such as from uniform or apodized to phase shifted or superstructure, often requiring high voltage piezoelectric elements or impractical temperature control, which restricts spectral response tuning capabilities.
Innovation Solution
A device comprising deformable slides with corrugated sections and an actuator that applies axial compressive or tensile strain to the fiber grating, allowing for localized changes in the refractive index perturbation profile, enabling transformation from one grating structure to another, such as uniform to phase shifted or superstructure, thereby modifying the spectral response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high voltage piezoelectric elements are used to tune fiber gratings, then spectral response tuning capability is improved, but device complexity and voltage requirements increase
Solution Approach 1:
The patent replaces complex high voltage piezoelectric actuation systems with a simple mechanical deformation approach. Deformable slides with corrugated sections apply direct mechanical strain to the fiber grating through geometric deformation, eliminating the need for piezoelectric elements and high voltage power supplies while achieving the same spectral tuning capability
Solution Approach 2:
The invention extracts and removes the complex piezoelectric high voltage elements from the tuning system, retaining only the essential mechanical deformation function. The deformable slides provide a simplified mechanism that achieves spectral response tuning through pure mechanical means without requiring piezoelectric materials or high voltage circuits
2Adaptability or versatility
If temperature control methods are used to tune fiber gratings, then spectral response tuning is achieved, but practical implementation becomes difficult
Solution Approach 1:
The patent substitutes thermal control methods with direct mechanical deformation. Instead of using temperature control to induce refractive index changes, the deformable slides apply mechanical strain directly to the fiber grating, achieving spectral tuning through mechanical means that are easier to implement and control in practical applications
Solution Approach 2:
The invention changes the control parameter from temperature to mechanical deformation. By using deformable slides that can be easily actuated mechanically, the system achieves spectral response tuning through parameter changes in the fiber grating's physical state without requiring complex temperature control infrastructure
3Ease of operation
If uniform strain is applied to the fiber grating, then device simplicity is maintained, but inability to create localized refractive index changes limits spectral tuning
Solution Approach 1:
The patent implements local quality by designing deformable slides with corrugated sections that create non-uniform strain distribution along the fiber grating. The geometric features of the slides produce localized deformation zones that can create specific refractive index profiles (phase-shifted, superstructure) from uniform gratings, enabling spectral response transformation while maintaining mechanical simplicity
Solution Approach 2:
The deformable slides are designed with segmented corrugated sections that can independently deform different regions of the fiber grating. This segmentation allows localized strain application to specific portions of the grating, enabling creation of complex refractive index profiles through controlled local deformation while keeping the overall device structure simple
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 allows for precise tuning of the spectral response of optical fiber gratings by inducing strain, overcoming limitations of previous methods and enabling complex refractive index profiles, which enhances the versatility and performance of fiber grating devices in applications like optical communication and sensing.
Implementation Method 1
an actuator configured to apply force to the first and second deformable slides, thereby inducing axial compressive or tensile strain to the fiber grating
Implementation Method 2
inducing axial compressive or tensile strain to the fiber grating via the fixed connections
Implementation Method 3
a refractive index perturbation profile of the fiber grating is changed in response to the actuator
Data Source
AI summary
Application of non-uniform strain to discrete segments of a fiber grating mechanically changes the structure type of the associated device, e.g., the refractive index perturbation profile of the fiber grating is changed from uniform to phase shifted superstructured, or from chirped to superstructured. The strain may be applied with one or more deformable corrugated slides which are bonded to the fiber grating between the discrete segments. The applied strain changes the local period of fiber grating. Complex changes may be achieved via variations of corrugated slide dimensions. An LPFG may be provided with bare fiber by applying periodically longitudinal axial strain to fiber at multiple discrete segments on the fiber.