Zigzag Impurity Phase Shifter for Silicon Photonics
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Solution Overview
Problem
Current silicon photonic integrated circuits face challenges in efficiently controlling the phase of optical signals due to limitations in phase shifting technology, which affects the modulation efficiency of optical signals in photonic communication systems.
Innovation Solution
A silicon phase shifter with zigzag patterned impurity regions and electrodes is introduced, allowing for efficient phase control of optical signals by varying charge carrier densities in the impurity regions in contact with the optical waveguide, enhancing phase shifting capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional planar impurity regions are used in silicon photonic circuits, then the device structure is simple and easy to manufacture, but the contact area between impurity regions and optical waveguide is limited, reducing phase shifting efficiency
Solution Approach 1:
The patent applies curvature by transforming the planar impurity region interface into a zigzag patterned interface. This zigzag configuration increases the contact perimeter between the impurity region and optical waveguide without adding complex three-dimensional structures, thereby enhancing phase shifting efficiency while maintaining manufacturing simplicity through standard photolithography processes.
2Productivity
If the contact area between impurity regions and optical waveguide is increased to improve phase control, then phase shifting efficiency improves, but the device complexity increases
Solution Approach 1:
The zigzag patterned interface provides increased contact area through a two-dimensional geometric modification rather than three-dimensional structuring. This approach achieves enhanced phase shifting efficiency without introducing complex vertical stacking or multi-layer alignment requirements, thereby avoiding significant increases in device complexity.
Solution Approach 2:
The zigzag interface can be viewed as segmented into multiple contact segments along the propagation direction. Each zigzag segment contributes to the overall phase shifting effect, allowing the total phase shift to be distributed across multiple smaller contact regions, which enhances efficiency without requiring a single complex structure.
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 solution enables efficient phase shifting and modulation of optical signals, improving the performance of silicon photonic integrated circuits by increasing the contact area between the optical waveguide and impurity regions, thus enhancing the phase control and modulation efficiency.
Implementation Method 1
The electrical signal adjusts densities of the respective charge carriers to vary a magnitude of phase shift of the optical output signal
Data Source
AI summary
A phase shifter includes an optical waveguide, a plurality of impurity regions and a plurality of electrodes. The optical waveguide receives an optical input signal and outputs an optical output signal. The impurity regions include respective charge carriers. The impurity regions are disposed in contact with the optical waveguide at respective contact surface, where at least one of the contact surfaces has a zigzag pattern. The electrodes are connected to the respective impurity regions. Application of an electrical signal to at least one of the electrodes phase-shifts the optical output signal with respect to the optical input signal. Therefore, the phase shifter may efficiently vary a magnitude of the phase shift of the optical output signal.