Wavelength Conversion Element Grating Slab Waveguide Selection
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Solution Overview
Problem
The challenge in fabricating nonlinear optical waveguides lies in the inefficiencies caused by chemical dry etching, which results in unwanted slab waveguides, leading to erroneous measurements and low yield during the selection of waveguides with desired optical characteristics.
Innovation Solution
A wavelength conversion device is designed with a plurality of waveguides and slab waveguides having a grating structure where the index of refraction periodically varies, allowing for the selection of waveguides based on reflected light of specific wavelengths, thereby facilitating accurate optical coupling and reducing errors in waveguide selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical dry etching is used to fabricate waveguides, then waveguide structures can be formed, but unwanted slab waveguides are generated causing measurement errors and low yield
Solution Approach 1:
The invention segments the waveguide array into individually addressable units by introducing unique identifier patterns (gratings or microlenses) at the output end of each waveguide. This segmentation allows optical measurement tools to selectively measure only the intended waveguide, preventing measurement errors from unwanted slab waveguides while maintaining the efficiency of batch fabrication.
2Productivity
If multiple waveguides are fabricated simultaneously on a substrate, then productivity increases, but selection and measurement of desired waveguides becomes difficult
Solution Approach 1:
The invention implements a feedback mechanism where unique identifier patterns (gratings or microlenses) are embedded at the output of each waveguide. During measurement, the system detects these identifiers to receive feedback about which waveguide is being measured, enabling automatic selection and characterization of desired waveguides from the array, thus simplifying the measurement process while maintaining high productivity.
3Ease of manufacture
If unwanted slab waveguides are present in the waveguide array, then fabrication process remains simple, but measurement errors occur and yield decreases
Solution Approach 1:
The invention extracts the identification function from the waveguide structure itself by adding separate identifier elements (gratings or microlenses) at the output end. This extraction allows the measurement system to distinguish between functional waveguides and unwanted slab waveguides, eliminating measurement errors while keeping the fabrication process simple and unchanged.
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 approach enables efficient fabrication of wavelength conversion devices by allowing for precise selection and alignment of waveguides, reducing errors and increasing yield, and improving the overall manufacturing process.
Implementation Method 1
each of the plurality of slab waveguides has a structure in which the same shape is periodically repeated, that is, a grating structure
Implementation Method 2
allows for the selection of waveguides based on reflected light of specific wavelengths
Implementation Method 3
a grating structure in which an index of refraction periodically varies in a length direction of the waveguide
Data Source
AI summary
With a wavelength conversion device based on a nonlinear optical effect, when arrayed waveguides including an intended nonlinear waveguide are fabricated, unwanted slab waveguides are inevitably formed. The slab waveguides can cause an erroneous measurement in the selection of a waveguide having desired characteristics from the arrayed waveguides. The erroneous measurement can lead to redoing steps for fabricating the wavelength conversion device and a decrease in the yield and inhibit the evaluation of the characteristics in selection of the waveguide and the subsequent fabrication of the wavelength conversion device from being efficiently performed. A wavelength conversion device according to the present invention includes a plurality of waveguides formed on a substrate, and a plurality of slab waveguides that are arranged substantially in parallel with and spaced apart from the plurality of waveguides, and each of the slab waveguides has a grating structure that reflects light of a particular wavelength.