東華大學圖書館 |

Practical Environmental Sensing on Optical Communication Infrastructure /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Practical Environmental Sensing on Optical Communication Infrastructure // Joseph W Catudal.
作者:	Catudal, Joseph W.,
面頁冊數:	1 electronic resource (138 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
Contained By:	Dissertations Abstracts International86-02B.
標題:	Computer science. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31557987
ISBN:	9798383699201

Practical Environmental Sensing on Optical Communication Infrastructure /
Catudal, Joseph W.,

Practical Environmental Sensing on Optical Communication Infrastructure /Joseph W Catudal. - 1 electronic resource (138 pages)

Source: Dissertations Abstracts International, Volume: 86-02, Section: B.

Optical networks are an essential component of today's communications infrastructure, providing connectivity across the globe at trillions of bits per second on a single optical fiber. Significant advances in monitoring environmental effects through the use of dedicated fiber optic sensors has also provided a wealth of information about the world around us. However, fiber optic sensing on communications infrastructure is largely limited due to diverging requirements between the two applications.In this thesis, we explore the potential of using fiber optic network communications infrastructure as a sensing platform in a metro environment. Our overall approach to this research is to examine the potential for widespread environmental sensing on optical communications infrastructure through empirical study. We identify several approaches for measuring characteristics of light in fiber and develop laboratory-based experiments to further develop these designs, and then validate their effectiveness at detecting physical events on optical fiber. We provide insight into the characteristics that make a fiber optic route a potential candidate for environmental sensing, and for limiting factors that may not be initially considered when selecting routes for monitoring.We first leverage the functions of a commodity optical transceiver to measure environmental effects on optical fiber to understand the existing capabilities of monitoring via the use of optical communications infrastructure. We conducted laboratory experiments to observe polarization changes under repeated bending strain and vibration. In addition, we monitor a 4-kilometer fiber path in an urban setting, examining the result of specific events along its indoor and outdoor routes, including opening fiber trays and truck-mounted tap testing. We also installed a specially designed 100-meter fiber route and observed polarization transience, correlating external factors such as diurnal patterns, temperature changes, precipitation, and passing freight trains to evaluate the sensing potential of these devices. While the optical transceiver is capable of detecting small polarization transients, low sampling rate and weak coupling to vibration sources limit the effectiveness of detecting some anthropological activity, such as passing freight trains.We then explore environmental sensing on optical communication fiber through polarimetry-based measurements to improve our environmental sensing capabilities. We construct a low-cost polarimeter with a sampling rate capable of detecting vibrations of interest. We then design and build our own polarimeter to increase sensitivity to polarization transients and evaluate various metrics to characterize environmental effects. We examine the outcomes of different levels of coupling of a fiber to a vibration-resonant medium to detect freight trains. Finally, we compare these findings with the monitoring of the same railway route using a campus network optical fiber and assess the response strength to passing trains. Our findings show that sensor accuracy is strongly influenced by the level of coupling between a sensing fiber and a vibrating medium.After exploring the use of polarimetry for inferring environmental effects, we created a low-cost, easy-to-implement fiber specklegram sensor capable of detecting physical effects on optical fiber. We construct a prototype sensor and establish metrics for evaluating environmental changes that affect the fiber. Subsequently, we enhance the design to increase its stability and portability, and examine the results of strong coupling with a vibrating medium in a laboratory setting with fiber lengths up to 1 km. We then deploy our sensor in situ and analyze its performance in measuring cultural events in a metro environment. Our device shows high sensitivity to train traffic, but accuracy can be impacted due to ambient effects or events that overstimulate the sensor and fiber.The research presented in this thesis demonstrates a practical approach to using sensing capabilities in network infrastructure. This work provides a foundation for numerous opportunities for research, public safety, and smart city applications that can complement traditional sensing methods.

English

ISBN: 9798383699201Subjects--Topical Terms:

523869
Computer science.
Subjects--Index Terms:

Fiber optic sensing

Practical Environmental Sensing on Optical Communication Infrastructure /
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650 4 $a Optics. $3 517925
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650 4 $a Information technology. $3 532993
650 4 $a Electrical engineering. $3 649834
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653 $a Optical communication
653 $a Optical networks
653 $a Signal processing
653 $a Optical fiber
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