Tapered Cladding Optical Waveguide for High-Efficiency Light Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fiber laser systems have low light coupling efficiency, requiring multiple laborious and difficult-to-manufacture pumping fibers to achieve effective light coupling.
Innovation Solution
The optical waveguide core and cladding run continuously through two segments, with the pumping fiber embedded in the cladding, where the cladding's cross section increases in a tapered form, allowing for improved light coupling efficiency by forming a micro-structured multimode or PCF optical waveguide with capillary-type hollow spaces or periodic refractive index profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pumping fibers are used to achieve effective light coupling, then light coupling efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the geometric parameters of the cladding by implementing a tapered cross-section that increases along the propagation direction. This parameter change allows a single pumping fiber to effectively couple light into the waveguide by matching impedance and reducing reflection, eliminating the need for multiple pumping fibers while maintaining high coupling efficiency
Solution Approach 2:
Instead of using multiple pumping fibers to achieve sufficient light coupling, the patent inverts the approach by optimizing the cladding structure itself. The tapered cladding design enables a single pumping fiber to be highly effective, turning the problem from 'how many fibers are needed' to 'how to design the cladding for optimal single-fiber coupling'
2Reliability
If multiple pumping fibers are used to achieve effective light coupling, then light coupling efficiency is improved, but ease of manufacture deteriorates
Solution Approach 1:
The tapered cross-section parameter of the cladding simplifies manufacturing by reducing the assembly from multiple fibers to a single fiber configuration. This parameter change in the cladding geometry makes the manufacturing process more straightforward while achieving the required light coupling efficiency
3Reliability
If the cross section of the cladding increases in tapered form, then light coupling efficiency is improved, but feedback increases
Solution Approach 1:
The patent carefully controls the taper angle and cross-section increase rate as parameters to optimize performance. By adjusting these parameters, the design achieves high light coupling efficiency while managing the feedback effect, ensuring that the beneficial impedance matching outweighs the potential harmful reflections
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 configuration enhances light coupling efficiency, simplifies manufacturing, and reduces feedback, enabling a more powerful laser system with fewer pumping fibers.
Implementation Method 1
the cross section of the cladding increases in tapered form... the end of the pumping fiber embedded in the cladding runs along the cladding and emerges from the forward face out of the end of the second length segment
Implementation Method 2
the micro-structured multimode optical wave guide is hereby formed with the aid of capillary-type hollow spaces, which lie next to one another under the cladding area
Implementation Method 3
the optical wave guide comprises a cladding... the optical refractive index of the first cladding runs periodically across the cross section
Data Source
AI summary
The invention relates to an apparatus for coupling light into an optical wave guide, a laser system with such an apparatus, and a preform to manufacture the apparatus for coupling light into an optical wave guide with the aid of a pumping fiber to guide the light, whereby the optical wave guide comprises a core with a cladding and an initial length segment with a second length segment immediately connected to it, whose cross section increases in tapered form with respect to the first length segment. In order to make a powerful apparatus and thereby a powerful laser system available, including the corresponding preform, it is recommended that the core and cladding of the optical wave guide run continuously through the first length segment and the second length segment, that the end of the pumping fiber embedded in the cladding of the second length segment runs along the cladding and emerges from the forward face out of the end of the second length segment, and that the cross section of the cladding increases in tapered form. Preferably, the cross section of the pumping fiber increases together with the cross section of the second cladding.