Tapered Light Coupling Material for Waveguide Alignment
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Solution Overview
Problem
Optical gratings exhibit poor coupling efficiency due to misalignment and size disparities between light emitting elements and waveguides, leading to reduced light transmission and increased complexity in precise positioning for improved coupling.
Innovation Solution
A device comprising a waveguide, cladding, and light coupling material is designed with a tapered structure, where the light coupling material has a thickness decreasing towards the waveguide, enhancing light convergence and internal reflection, thereby improving coupling efficiency while accommodating misalignment and miniaturization requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical gratings are used to redirect light from light sources to detectors or waveguides, then light coupling is facilitated, but coupling efficiency deteriorates due to misalignment and size disparities
Solution Approach 1:
A light coupling material with tapered thickness is introduced as an intermediary component between the light source and the waveguide. This material has a first surface facing the light source and a second surface facing the waveguide, with thickness decreasing from the first surface to the second surface. The tapered structure acts as a mediator that gradually transitions the light from the larger light source area to the smaller waveguide area, improving coupling efficiency while maintaining ease of operation.
2Loss of energy
If precise positioning is implemented to improve coupling between light emitting elements and waveguides, then coupling efficiency is improved, but device complexity increases
Solution Approach 1:
The light coupling material employs a tapered thickness parameter, transitioning from a first thickness at the light source interface to a second, smaller thickness at the waveguide interface. This parameter change creates a gradual optical transition zone that reduces sensitivity to misalignment, thereby improving coupling efficiency without requiring complex precise positioning mechanisms.
3Volume of moving object
If the size of light emitting elements is reduced for miniaturization, then device size is reduced, but coupling efficiency deteriorates due to increased misalignment sensitivity
Solution Approach 1:
The solution addresses the miniaturization challenge by introducing a dimensional gradient in the light coupling material. The thickness of the material varies continuously from the light source side to the waveguide side, creating a three-dimensional tapered structure. This dimensional variation provides a gradual transition zone that maintains coupling efficiency even when the overall device size is reduced.
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 solution significantly enhances light coupling efficiency by ensuring more light is directed into the waveguide, reducing scattering, and simplifying the alignment process, thus improving the overall performance and throughput of optical coupling devices.
Implementation Method 1
light traveling through the light coupling material and toward the waveguide converges in a thickness-wise direction of the waveguide into the waveguide
Implementation Method 2
enhancing light convergence and internal reflection
Data Source
AI summary
A device is provided. The device may be an optical device, a light coupling device, or a device containing an optical structure. The device includes a waveguide, a cladding, and a light coupling material. The light coupling material is disposed adjacent to the waveguide and has a first surface and a second surface, where the second surface is disposed further away from the waveguide than the first surface and a thickness of the second surface is greater than that of the first surface.