Underwater Optical Modem Omni-Directional Diffuser Design
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Solution Overview
Problem
Current underwater communication systems for unmanned underwater vehicles (UUVs) and seafloor observatories face limitations in bandwidth and range, particularly with acoustic communication systems that restrict high-rate data transfers and are not suitable for bidirectional wireless communication.
Innovation Solution
An optical communication system utilizing transmitters and receivers that emit and receive electromagnetic radiation in the optical spectrum, with diffusers to enable omni-directional transmission and reception, allowing for high-bandwidth and high-range bidirectional communication between underwater nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic communication systems are used for underwater communication, then communication can be established between UUVs and seafloor observatories, but the bandwidth is limited and high-rate data transfers are restricted
Solution Approach 1:
The patent replaces acoustic communication systems with optical communication systems. Specifically, it uses light-emitting diodes (LEDs) or laser diodes as transmitters and photodiodes or photomultiplier tubes as receivers to transmit and receive optical signals underwater, substituting the acoustic field with the optical field for communication purposes
Solution Approach 2:
The patent changes the fundamental parameter of the communication medium from acoustic waves to optical waves. By using optical radiation in the wavelength range of 300-800 nm that penetrates water effectively, the system achieves much higher bandwidth and data transfer rates compared to acoustic systems
2Productivity
If directional transmitters and receivers are used, then communication efficiency may be improved, but the system becomes sensitive to alignment and positioning between nodes
Solution Approach 1:
The patent divides the transmission and reception functions into separate components: a light source (LED or laser diode) for transmission and a photodetector (photodiode or photomultiplier tube) for reception. This segmentation allows the system to use simple directional emitters while achieving reliable communication through dedicated receiver placement
Solution Approach 2:
The patent introduces optical coupling elements and positioning mechanisms as intermediaries to facilitate alignment. These intermediaries help bridge the gap between the directional nature of optical sources and the need for reliable communication without requiring precise manual alignment
3Productivity
If optical communication systems are used, then high-bandwidth communication is achieved, but the communication range is limited compared to acoustic systems
Solution Approach 1:
The patent employs dynamic positioning systems and movable platforms to maintain optimal communication distances. By allowing the communication nodes to move and adjust their positions dynamically, the system can maintain the short-range optical link while achieving high bandwidth, effectively managing the range limitation through active position control
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
Enables reliable and efficient high-bandwidth communication over distances of up to 100 meters or more, supporting data rates of approximately 1 Mbps or higher, facilitating the transfer of high-rate data including video and sensor information between UUVs and seafloor observatories.
Implementation Method 1
The diffuser is disposed in a position surrounding a portion of the source for diffusing the electromagnetic radiation in a plurality of directions
Implementation Method 2
a source capable of emitting electromagnetic radiation, and a diffuser capable of diffusing the electromagnetic radiation
Implementation Method 3
a receiver having a detector capable of detecting electromagnetic radiation, such that the electromagnetic radiation can be received in substantially any direction
Data Source
AI summary
The systems and methods of the invention provide for improved underwater communication systems. In particular, the systems and methods of the invention provide for improved underwater optical modems including optical transmitters and optical receivers that allow omni-directional transmission and reception of optical signals underwater and having a range of about 100 m and allowing data rates greater than 1 Mbit/s. The systems and methods of the invention also provide for underwater communication networks having a plurality of optical modems communicating with each other.