Optical Filter With Segmented Waveguides For Temperature Stability
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Solution Overview
Problem
Silicon photonics optical filters face challenges in minimizing temperature dependency and waveguide length, as reducing temperature dependency often results in longer waveguides, which increase size and propagation loss.
Innovation Solution
The optical filter design incorporates three or more waveguides with distinct sections, including polarization rotators, where the lengths of these sections are optimized using equations that account for propagation constants and phase changes to minimize both temperature dependency and waveguide length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the waveguide length is increased to reduce temperature dependency, then the temperature stability is improved, but the device size and propagation loss increase
Solution Approach 1:
The waveguide is divided into multiple sections with different cross-sectional dimensions along its length. Each section has specific width and height parameters that are optimized to control the propagation characteristics of different modes. This segmentation allows the waveguide to achieve temperature compensation without requiring excessive total length, as each segment contributes differently to the overall phase relationship between modes.
Solution Approach 2:
Different sections of the waveguide have locally optimized dimensions to control mode propagation characteristics. The width and height of the waveguide vary at different positions to create specific effective refractive index profiles. This local variation in geometry allows different modes to experience different effective path lengths, enabling temperature compensation while maintaining a compact overall device length.
2Stability of the object's composition
If the waveguide length is increased to reduce temperature dependency, then the temperature stability is improved, but the propagation loss increases
Solution Approach 1:
The waveguide is divided into multiple sections with different cross-sectional dimensions along its length. Each section has specific width and height parameters that are optimized to control the propagation characteristics of different modes. This segmentation allows the waveguide to achieve temperature compensation without requiring excessive total length, as each segment contributes differently to the overall phase relationship between modes.
Solution Approach 2:
The effective refractive index of the waveguide is modified by changing the physical dimensions (width and height) of different sections. By adjusting these geometric parameters, the propagation constants of different modes are tuned to achieve the desired temperature compensation effect. This parameter optimization allows for reduced waveguide length while maintaining temperature stability, thereby reducing propagation loss.
3Stability of the object's composition
If multiple modes are propagated through the waveguide, then the temperature dependency is reduced, but the device complexity increases
Solution Approach 1:
A single waveguide structure performs multiple functions: it guides light, differentiates between modes through geometric variations, and provides temperature compensation. The same waveguide sections that control mode propagation also establish the phase relationships needed for temperature insensitivity. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving the desired temperature stability.
Solution Approach 2:
The effective refractive index of the waveguide is modified by changing the physical dimensions (width and height) of different sections. By adjusting these geometric parameters, the propagation constants of different modes are tuned to achieve the desired temperature compensation effect. This parameter optimization allows for reduced waveguide length while maintaining temperature stability, thereby reducing propagation loss.
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 allows for a compact optical filter with reduced temperature dependency and waveguide length, achieving both miniaturization and improved performance by propagating different modes of light through the filter.
Implementation Method 1
three or more waveguides, and a plurality of sections provided in the three or more waveguides, respectively. Modes of light propagating through the sections of the three or more waveguides are different from each other
Data Source
AI summary
It is an object to provide an optical filter, a method of manufacturing an optical filter, a method of designing, a design apparatus, and a program for designing non-transitory computer-readable recording medium which can suppress both the temperature dependency and the waveguide length. An optical filter includes three or more waveguides, and a plurality of sections provided in the three or more waveguides, respectively. Modes of light propagating through the sections of the three or more waveguides are different from each other.