Piezoelectric Rib Waveguide Modulation via Brillouin Scattering
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Solution Overview
Problem
Existing optical communication technologies using optical waveguides are complex and expensive compared to electrical and wireless technologies, necessitating a more efficient and cost-effective solution for optical signal management.
Innovation Solution
The use of acousto-optical modulators with piezoelectric waveguides that employ Brillouin scattering, incorporating interdigital transducers and a piezoelectric layer made of materials like lithium tantalate or lithium niobate, to modulate light via acoustic resonance, enhancing efficiency through acoustic Bragg mirrors and rib waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing optical waveguide technologies are used, then optical signal management is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex optical waveguide systems with a piezoelectric-based acousto-optical modulator that uses mechanical acoustic waves interacting with optical signals. The piezoelectric material converts electrical signals to mechanical vibrations, which then modulate the optical signal through Brillouin scattering, simplifying the overall system architecture while maintaining optical signal management functionality
Solution Approach 2:
The patent utilizes changes in the refractive index of the piezoelectric material induced by acoustic vibrations to modulate optical signals. By varying the acoustic frequency and amplitude, the refractive index changes dynamically, enabling control over optical signal parameters such as phase and amplitude without requiring complex optical components
2Reliability
If existing optical waveguide technologies are used, then optical signal management is achieved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive optical waveguide components with a piezoelectric-based modulator that uses readily available piezoelectric materials and standard fabrication processes. The acousto-optical interaction mechanism allows for simpler manufacturing while achieving the same optical signal management functions
Solution Approach 2:
The piezoelectric material serves multiple functions simultaneously: it acts as the optical waveguide medium, the acoustic wave generation medium, and the modulation medium. This multi-functionality eliminates the need for separate components, reducing manufacturing complexity and cost while maintaining reliable optical signal management
3Productivity
If Brillouin scattering is used for optical modulation, then modulation efficiency is improved, but device size constraints are challenged
Solution Approach 1:
The patent confines the optical and acoustic interactions to a three-dimensional rib waveguide structure within the piezoelectric material. By utilizing the vertical dimension with the rib geometry, the device achieves enhanced Brillouin scattering efficiency without requiring a proportionally larger footprint, thus improving modulation efficiency while controlling device size
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 provides efficient optical modulation with reduced complexity and cost, utilizing Brillouin scattering to achieve wavelength and phase shifts in optical signals, improving communication throughput in compact form factors.
Implementation Method 1
a piezoelectric layer including a top surface, a bottom surface, and a rib waveguide protruding from the top surface
Implementation Method 2
a first interdigital transducer disposed on the top surface of the piezoelectric layer, wherein the first interdigital transducer is positioned on a first side of the rib waveguide; and a second interdigital transducer disposed on the top surface of the piezoelectric layer
Implementation Method 3
acoustic resonance properties of the first interdigital transducer and the second interdigital transducer are selected to facilitate Brillouin scattering between optical modes of the rib waveguide
Implementation Method 4
an acoustic Bragg mirror formed between the silicon substrate and the piezoelectric layer
Data Source
AI summary
Aspects described herein include a device which may include a piezoelectric layer comprising a top surface, a bottom surface, and a rib waveguide protruding from the top surface. A device may include a first interdigital transducer disposed on the top surface of the piezoelectric layer, wherein the first interdigital transducer is positioned on a first side of the rib waveguide. A device may include a second interdigital transducer disposed on the top surface of the piezoelectric layer, wherein the second interdigital transducer is positioned on a second side of the rib waveguide opposite the first side.