Tunable Optical Device With Semiconductor Membrane Air Gap
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Solution Overview
Problem
In optical communication systems, existing methods for tuning optical devices based on material and fabrication process variations result in increased power consumption and larger device footprints, as they often require amplitude adjustments of injection current or refractive index changes.
Innovation Solution
The implementation of a tunable optical device with a semiconductor membrane layer and a tunable air gap, where the separation distance between the membrane layer and a fixed waveguide portion is controlled using a voltage signal, allowing for tuning of optical signal characteristics such as power, phase, and wavelength with minimal power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If amplitude of injection current is varied for tuning, then output power and wavelength can be tuned, but power consumption increases
Solution Approach 1:
The patent replaces the electrical injection current tuning mechanism with a mechanical tuning mechanism. A tunable optical device is provided where the waveguide structure itself can be mechanically adjusted or selected to achieve tuning of output power and wavelength without varying injection current amplitude, thereby reducing power consumption while maintaining adaptability
Solution Approach 2:
The patent introduces dynamic tuning capability through multiple selectable waveguide structures or configurations. The system can dynamically switch between different waveguide modes or physical configurations to achieve different output characteristics, providing adaptability without relying on continuous power variation
2Adaptability or versatility
If refractive index is varied based on carrier injection and/or thermal changes for tuning, then optical characteristics can be tuned, but device footprint increases
Solution Approach 1:
The patent segments the optical device into multiple distinct waveguide structures or regions, each with different optical characteristics. By selecting or switching between these segmented waveguide sections, tuning is achieved without requiring large-area refractive index modulation mechanisms, thus reducing device footprint while maintaining adaptability
Solution Approach 2:
The patent achieves tuning by utilizing different spatial dimensions or configurations of waveguide structures rather than relying on lateral expansion for refractive index modulation. This dimensional approach allows compact tuning functionality without increasing device footprint
3Adaptability or versatility
If multiple optical devices are implemented in the same system, then system functionality increases, but fabrication process variations cause tuning requirements
Solution Approach 1:
The patent utilizes parameter changes in the waveguide structure itself (such as geometry, material composition, or configuration) to compensate for fabrication variations. By designing waveguides with specific parameter ranges or tunable parameters, the system can adjust to manufacturing tolerances and maintain consistent performance across multiple devices without requiring additional tuning 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
This approach enables precise tuning of optical signal characteristics with reduced power consumption and minimal device footprint, improving the operational efficiency and flexibility of optical communication systems.
Implementation Method 1
a control signal is provided to electrodes associated with an optical tuning system that is coupled to a semiconductor membrane layer... to move the semiconductor membrane layer with respect to the waveguide
Data Source
AI summary
One example includes an optical device system. The system includes a waveguide that includes a fixed waveguide portion to propagate an optical signal, a semiconductor membrane layer, and a tunable air gap that separates the fixed waveguide portion and the semiconductor membrane layer. The system also includes an optical tuning system to move the semiconductor membrane layer with respect to the fixed waveguide portion in response to a control signal to control a separation distance of the tunable air gap to tune a characteristic of the optical signal.