Laser-Written Waveguides with Mode Tapering and 3D Routing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical waveguides in substrates face limitations in efficiently managing optical mode size and routing, particularly in nonlinear optics, where high power handling and efficient wavelength conversion are required, and existing technologies struggle with facet damage due to high optical power density and inefficient coupling between dissimilar devices.
Innovation Solution
Laser-written waveguides with buried tracks in optical substrates, featuring concentric rings or geometric regions with varying cross-sectional sizes and three-dimensional routing, allowing for controlled optical mode formation and arbitrary input/output locations, which mitigates facet damage and enhances coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional optical waveguides are used in substrates, then optical power density is high for nonlinear optical processes, but facet damage occurs and coupling efficiency between dissimilar devices is poor
Solution Approach 1:
The waveguide cross-sectional size is varied locally along its length, with the mode field diameter being larger at the facets and smaller in the middle section. This local variation in geometry allows the waveguide to handle high optical power at the facets (reducing facet damage) while maintaining high optical power density in the middle section for efficient nonlinear optical processes.
Solution Approach 2:
The waveguide parameters, specifically the cross-sectional size and mode field diameter, are changed along the length of the waveguide. The mode field diameter is increased at the input and output facets to reduce optical power density and prevent facet damage, while being decreased in the middle section to maintain high optical power density for nonlinear optical processes.
2Power
If conventional optical waveguides are used in substrates, then high power handling is achieved, but coupling efficiency between dissimilar devices is poor
Solution Approach 1:
The waveguide cross-sectional size is varied locally along its length, with the mode field diameter being larger at the facets and smaller in the middle section. This local variation in geometry allows the waveguide to handle high optical power at the facets (reducing facet damage) while maintaining high optical power density in the middle section for efficient nonlinear optical processes.
Solution Approach 2:
The waveguide parameters, specifically the cross-sectional size and mode field diameter, are changed along the length of the waveguide. The mode field diameter is increased at the input and output facets to reduce optical power density and prevent facet damage, while being decreased in the middle section to maintain high optical power density for nonlinear optical processes.
3Ease of manufacture
If laser-written tracks with constant cross-sectional size are used, then manufacturing is simplified, but mode size control and routing flexibility are limited
Solution Approach 1:
The waveguide cross-sectional size is varied locally along its length, with the mode field diameter being larger at the facets and smaller in the middle section. This local variation in geometry allows the waveguide to handle high optical power at the facets (reducing facet damage) while maintaining high optical power density in the middle section for efficient nonlinear optical processes.
Solution Approach 2:
The waveguide design transitions from a two-dimensional constant cross-section to a three-dimensional variable cross-section along the propagation direction. This adds the dimension of longitudinal variation to the waveguide geometry, enabling control of mode field diameter along the length while maintaining constant transverse dimensions of the laser tracks.
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 enables efficient coupling between optical devices, reduces facet damage through controlled optical power density, and allows for high power handling and efficient wavelength conversion by managing optical mode sizes and routing, thereby improving nonlinear optical processes.
Implementation Method 1
a waveguide channel delimited by the concentric rings, wherein the waveguide channel is configured to allow formation of an optical mode
Implementation Method 2
Laser written waveguides with mode tapering, differactive expansion and three-dimensional routing
Data Source
AI summary
A laser-written waveguide comprising, an optical substrate having a first refractive index, a plurality of laser-written tracks buried within the optical substrate and having a second refractive index lower than the first refractive index, one or more concentric geometric regions bounding the plurality of laser-written tracks and a waveguide channel delimited by said concentric geometric regions, wherein said waveguide channel is configured to allow formation of an optical mode.