Laterally Guided VCSEL Array for Steerable Underwater Optical Links
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Solution Overview
Problem
Existing underwater communication systems face challenges such as limited range, high power requirements, and susceptibility to fading and bit error rate issues, making them impractical for efficient and covert underwater networking.
Innovation Solution
The optical device comprises a substrate with vertical-cavity surface-emitting lasers (VCSELs) and a coupling layer with optical guides that redirect the output from a vertical to a lateral path, along with controllable delay elements and a controller to shape and steer the output beam, enabling multi-beam, multi-wavelength, phased array steering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional underwater communication systems use copper cables or acoustic modems, then communication reliability is maintained, but the system complexity and power requirements increase significantly
Solution Approach 1:
The patent replaces traditional mechanical/electrical communication systems (copper cables, acoustic modems) with an optical system using VCSELs and waveguides. This substitution enables wireless optical communication through water, reducing the need for physical tethers and complex acoustic processing while maintaining communication reliability
Solution Approach 2:
The patent utilizes wavelength division multiplexing with VCSELs operating at different wavelengths (e.g., 405nm, 450nm, 505nm) to enable multiple communication channels simultaneously. This parameter change allows parallel data transmission across different spectral bands, increasing capacity without proportionally increasing system complexity
2Length of moving object
If high power is used to extend communication range, then communication distance increases, but power consumption and detectability increase
Solution Approach 1:
The patent employs dynamically controllable delay elements that can adjust the phase and timing of optical signals from individual VCSELs. This dynamic control enables adaptive beam steering and focusing, allowing the system to extend communication range through constructive interference patterns without proportionally increasing power consumption
Solution Approach 2:
The patent transitions from omnidirectional or limited-direction emission to three-dimensional beam steering capability. By controlling the phase and delay of multiple VCSELs, the system can direct optical energy precisely in different spatial dimensions, extending effective communication range without increasing total power output
3Productivity
If multiple VCSELs operate simultaneously at different wavelengths, then communication capacity increases, but beam control and signal interference management become more difficult
Solution Approach 1:
The patent divides the communication system into multiple independent wavelength channels, each handled by specific VCSELs with dedicated waveguide paths. This segmentation allows independent control and optimization of each wavelength channel, managing complexity through modular architecture while maintaining high aggregate communication capacity
Solution Approach 2:
The patent introduces controllable delay elements as intermediary components between the VCSELs and the output medium. These delay elements act as mediators that can independently adjust the phase and timing of each wavelength channel, enabling coherent beam combining and interference management across multiple wavelengths without direct complex interaction between VCSELs
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 allows for high-speed, low-power, and covert underwater communication networks without the need for tethering, enabling effective communication across large underwater volumes with reduced size, weight, and power requirements.
Implementation Method 1
a coupling layer over the substrate and comprising a plurality of optical guides aligned with the plurality of VCSELs to guide outputs thereof from a vertical path direction to a lateral path direction
Data Source
AI summary
An optical device may include a substrate and vertical-cavity surface-emitting lasers (VCSELs) on the substrate. The optical device may also include a coupling layer over the substrate and that includes optical guides aligned with the VCSELs to guide outputs thereof from a vertical path direction to a lateral path direction. The optical device also includes controllable delay elements, each controllable delay element associated with a respective optical guide, and a controller coupled to the controllable delay elements.