A Microcontroller-based, Optically-centric Communication System for Underwater Applications

A Microcontroller-based, Optically-centric Communication System for Underwater Applications

Bibliographic Details
Main Author: Alexander, Joshua L.
Language:English
Published: University of Cincinnati / OhioLINK 2017
Subjects:
Engineering
communication
underwater
attenuation
microcontroller
optical
FSO
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868704379707
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin15048687043797072021-08-03T07:04:08Z A Microcontroller-based, Optically-centric Communication System for Underwater Applications Alexander, Joshua L. Engineering communication underwater attenuation microcontroller optical FSO We live on a water planet. Over seventy percent of the Earth’s surface is covered in water. Yet, we cannot communicate underwater. There currently exists no high-bandwidth communication system for use in oceanic environments. Blue light is the key to underwater communication. Short visible wavelengths have low attenuation rates in both fresh water and saltwater. Additionally, visible light is unregulated spectrum and is a secure, line-of-sight data carrier.A microcontroller-based system has been developed to use blue light to create a dynamic, full-duplex communication system with self-aligning capabilities. A collimated beam is supplied from a high-power laser diode driven by an integrated driver using Manchester coding techniques. The microcontroller’s ADC module facilitates data/clock recovery operations, maintains optical alignment using a novel sampling approach, and monitors important voltage/current sense measurements across the system. Concurrently, a set of analog servos are used in a gimbal to align the optics of each transceiver.This system is built with intentions to be used in the OpenROV. This underwater rover will inherit a pair of transceivers to replace its long tether. By interfacing through Ethernet, this system is noninvasive and entirely reversible. Additionally, the system can easily be realized to replace existing wired links in other Ethernet networks.Error-free data rates up to 125kHz have been achieved with the current transceiver pair. This is half the data rate original envisioned for this system. Simple modifications to this design could scale the bandwidth by a factor of 20 or more. Additionally, improvements need to be made to the alignment processes to be able to accurately correct misalignments at greater distances. Regardless, this system is a significant step in underwater communication. 2017 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868704379707 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868704379707 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Engineering
communication
underwater
attenuation
microcontroller
optical
FSO
spellingShingle Engineering
communication
underwater
attenuation
microcontroller
optical
FSO
Alexander, Joshua L.
A Microcontroller-based, Optically-centric Communication System for Underwater Applications
author Alexander, Joshua L.
author_facet Alexander, Joshua L.
author_sort Alexander, Joshua L.
title A Microcontroller-based, Optically-centric Communication System for Underwater Applications
title_short A Microcontroller-based, Optically-centric Communication System for Underwater Applications
title_full A Microcontroller-based, Optically-centric Communication System for Underwater Applications
title_fullStr A Microcontroller-based, Optically-centric Communication System for Underwater Applications
title_full_unstemmed A Microcontroller-based, Optically-centric Communication System for Underwater Applications
title_sort microcontroller-based, optically-centric communication system for underwater applications
publisher University of Cincinnati / OhioLINK
publishDate 2017
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1504868704379707
work_keys_str_mv AT alexanderjoshual amicrocontrollerbasedopticallycentriccommunicationsystemforunderwaterapplications
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