Compact Photonic Polarisation Control With Dual-Mode Converters
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Solution Overview
Problem
Existing polarisation control systems in photonic integrated circuits (PICs) are bulky and require different sequences of components for polarisation controllers and scramblers, limiting their compactness and flexibility.
Innovation Solution
A polarisation control device comprising a combination of actively-controlled polarisation converters with specific cross-sectional structures and control elements that can modify effective refractive indices, allowing the same device to function as both a polarisation controller and scrambler, reducing footprint and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate component sequences are used for polarisation controllers and scramblers, then functional versatility is improved, but device footprint and complexity increase
Solution Approach 1:
The patent implements a single polarisation control device that can operate in multiple modes: as a polarisation controller when phase shifters are held constant, and as a polarisation scrambler when phase shifters are dynamically adjusted. This multi-functional design eliminates the need for separate component sequences for controllers and scramblers, reducing device footprint while maintaining full functional versatility
Solution Approach 2:
The device incorporates dynamically controllable phase shifters that can be adjusted in real-time to switch between controller and scrambler modes. The phase shifters enable the system to adapt its behavior based on operational requirements, allowing a single static physical structure to perform multiple functions that previously required different component sequences
2Adaptability or versatility
If multiple separate devices are used for different polarisation functions, then functional specificity is improved, but device complexity increases
Solution Approach 1:
The patent designs a universal polarisation control device that integrates both controller and scrambler capabilities within a single structure. The same waveguide, polarisation converters, and phase shifters serve dual purposes depending on the control signals applied, thereby reducing device complexity while maintaining functional specificity for both operations
Solution Approach 2:
The patent merges the previously separate controller and scrambler functions into a single integrated device. The polarisation converters and phase shifters are combined in such a way that their coordinated operation enables both controlled polarisation transformation and random polarisation scrambling, eliminating the need for multiple separate devices and reducing overall system complexity
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 provides a compact polarisation control device that can dynamically modify polarisation states, offering both controller and scrambler functions with reduced spatial requirements and improved control over a wide range of polarisation states.
Implementation Method 1
At least one control element is provided which is configured to alter the effective refractive indices of the first, second, third and fourth modes
Data Source
AI summary
A polarisation control device for a photonic integrated circuit, comprising a first polarisation converter and a second polarisation converter. The first polarisation converter has a first cross-sectional structure and supports a first mode and a second mode having different effective refractive indices to each other and having different orientations of polarisation to each other. The second polarisation converter has a second cross-sectional structure and supports a third mode and a fourth mode having different effective refractive indices to each other and having different orientations of polarisation to each other. A control element modifies the effective refractive indices in response to a signal.