Multi-core Polarization Maintaining Fiber Stress Dispersion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Elliptical core polarization-maintaining fibers are prone to deformation due to concentrated stress applied by stress-applying parts, leading to difficulties in fiber insertion and changes in polarization maintaining power after adhesive hardening.
Innovation Solution
A multicore polarization-maintaining fiber design with stress applying parts disposed in multiple directions to disperse stress, reducing deformation and maintaining polarization power, featuring cores with different cutoff wavelengths and refractive indices, and stress applying parts with higher thermal expansion coefficients than the cladding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stress applying parts are disposed in only one direction to maintain polarization, then polarization maintaining power is improved, but outer shape deformation increases
Solution Approach 1:
The patent applies asymmetry by disposing stress applying parts in multiple directions (first direction and second direction intersecting at an angle) rather than symmetrically in one direction. This asymmetric multi-directional arrangement disperses stress concentration while maintaining the polarization maintaining effect through controlled stress distribution.
Solution Approach 2:
The patent transitions from single-direction stress application to multi-directional stress application by adding stress applying parts in a second direction that intersects with the first direction. This dimensional expansion of stress application geometry disperses the stress concentration that causes outer shape deformation.
2Stability of the object's composition
If stress applying parts are disposed in multiple directions to reduce deformation, then outer shape stability is improved, but device complexity increases
Solution Approach 1:
The stress applying parts serve multiple functions: they maintain polarization by applying stress to cores, stabilize outer shape through multi-directional stress distribution, and can be arranged in regular patterns that simplify manufacturing. This multi-functionality justifies the increased structural complexity.
Solution Approach 2:
The patent segments the stress application function into multiple independent stress applying parts disposed in different directions. Each stress applying part independently contributes to polarization maintenance and shape stability, allowing modular design and simplified manufacturing through repetitive patterns.
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 design effectively reduces outer shape deformation, maintains high polarization maintaining power, and increases transmission capacity with minimal attenuation, even under bending or external stress.
Implementation Method 1
the plurality of stress applying parts include a first pair of stress applying parts and a second pair of stress applying parts... stress applying parts with higher thermal expansion coefficients than the cladding
Implementation Method 2
a polarization-maintaining fiber is an optical fiber that can propagate light beams with the polarized state of the light beams being maintained by giving a difference between the propagation constants of polarized waves orthogonal to each other
Data Source
Figure 1~2
Figure 3~4
AI summary
A multicore polarization-maintaining fiber 10 includes a plurality of cores 11, a cladding 12 surrounding the plurality of cores 11, and a plurality of stress applying parts 15 provided sandwiching the plurality of cores 11 in a region surrounded by the outer circumferential surface of the cladding 12. The cross sectional area of the stress applying part 15 is greater than the cross sectional area of the core 11. Stress applying parts 15 of the plurality of stress applying parts 15 are disposed in a first direction, and stress applying parts 15 of the plurality of stress applying parts 15 are disposed in a second direction different from the first direction.