Polarization Maintaining Fiber Core Design for Gyroscope Stability
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Solution Overview
Problem
Current polarization maintaining optical fibers face challenges in achieving high precision, miniaturization, and environmental adaptability, leading to instability and inadequate crosstalk output performance, which hinders the development of high-precision fiber-optic gyroscopes.
Innovation Solution
The optical fiber design features a fiber core with a central and annular region, surrounded by stress zones and a double-layer coating structure with varying moduli, optimizing the refractive indices and diameters to reduce external interference and enhance stability and crosstalk performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the core diameter of the polarization maintaining optical fiber is reduced to achieve miniaturization, then the fiber can be used in high-precision fiber-optic gyroscopes, but the optical fiber becomes greatly affected by environmental performance and stability deteriorates
Solution Approach 1:
The patent applies local quality by creating a non-uniform refractive index distribution within the fiber core, specifically with an annular region having a different refractive index than the central core region. This local variation in refractive index allows the fiber to maintain polarization characteristics while reducing the overall core diameter, thus resolving the contradiction between miniaturization and environmental stability.
Solution Approach 2:
The patent uses composite materials by combining different refractive index regions within the fiber core (central core region and annular region) to create a multi-structural optical fiber. This composite structure enables the fiber to achieve both small core diameter and high environmental stability by optimizing the refractive index distribution across different regions.
2Reliability
If the refractive index difference between core and cladding is increased to improve polarization maintaining capability, then polarization stability improves, but optical fiber attenuation increases
Solution Approach 1:
The patent applies local quality by creating a non-uniform refractive index distribution where the annular region has a higher refractive index than the central core region. This localized refractive index variation provides the necessary polarization maintaining capability while controlling the overall attenuation by optimizing the refractive index contrast in specific regions rather than uniformly throughout the entire core.
Solution Approach 2:
The patent uses parameter changes by carefully controlling the refractive index values in different regions of the fiber core. By optimizing the refractive index difference between the annular region and central core region, and between these regions and the cladding, the patent achieves polarization stability while minimizing optical fiber attenuation.
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 design results in a more stable and high-performance polarization maintaining optical fiber with improved crosstalk output and attenuation characteristics, suitable for high-precision fiber-optic gyroscope applications.
Implementation Method 1
Because the polarization maintaining optical fiber has a stress birefringence effect, the polarization maintaining optical fiber can maintain a good polarization state when transmitting a linearly polarized light
Implementation Method 2
The fiber core comprises a circular central core region and at least one annular region concentrically arranged with the central core region, the refractive indexes of the central core region and the annular region being different
Data Source
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AI summary
Disclosed in the present invention is a polarization maintaining optical fiber, which relates to the field of optical fibers. The polarization maintaining optical fiber comprises, in order from the inside to the outside, a fiber core, a quartz cladding layer, an inner coating layer and an outer coating layer. The quartz cladding layer is located at the periphery of the fiber core, two stress zones are provided between the quartz cladding layer and the fiber core, and the two stress zones are symmetrically distributed along the center of the fiber core. The fiber core comprises, in order from the inside to the outside, a circular central core region and at least one annular region concentrically arranged with the central core region, and the refractive indexes of the central core region and the annular region are different. The inner coating layer and the outer coating layer are both of a double-layer structure, and the modulus of each of the inner coating layer and the outer coating layer is different, and the modulus from the inside to the outside increases sequentially. The polarization maintaining optical fiber provided by the present invention provides more stable and higher crosstalk output and optical fiber attenuation performances.