Open ocean underwater wireless optical communication: chlorophyll and depth dependent variation in attenuation

Abdalkarim Tahir, Fatma (2015) Open ocean underwater wireless optical communication: chlorophyll and depth dependent variation in attenuation. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Underwater wireless optical communication (UWOC) is attracting more research interest as a result of increased interaction of human with underwater world. UWOC technology is expected to play a prominent role in the study of marine biology, ocean environment, prediction of natural disasters, and discovery of natural resources, surveillance and monitoring of deep sea oil. All of this requires exchange of information and communication between divers, ships, remotely operated vehicles and autonomous underwater vehicles. However, the optical waves for underwater communication are faced with some practical challenges. Study research shows that optical waves are rapidly absorbed in water, suspending particles and planktons, indirectly cause significant optical scattering which results to attenuation of optical transmitted signal. Hence there is a need to study how ocean composition affects the attenuation of optical composition in Deep Ocean and how chlorophyll profiles are used to determine regions with high attenuation. Most studies have considered the attenuation to be constant in Deep Ocean irrespective of depth. This project takes a look at the depth dependent optical attenuation in underwater wireless communication for wavelength ranging from (400-700 nm) and at different depth from 0-250 m based on chlorophyll concentration profile (S1-S9). In order to achieve this, a graphic user interface was designed using Matlab to simulate the optical attenuation for different wavelength and varying depths. The 3D Matlab simulation results show how the attenuation of light in Open Ocean can be determined using surface chlorophyll profile S1-S9. The depths where high optical attenuation exists in the ocean are shown to be regions with deep chlorophyll maximum (DCM). The results shows DCM regions for S1, S2, S3, S4, S5, S6, S7, S8, and S9 are 110, 90, 80, 60, 50, 30, 20, 15, 10 m respectively. This DCM region shows low specific chlorophyll absorption coefficients and high optical attenuations. The results also show that attenuation coefficient for under water optical communication systems vary with depth.

Item Type:Thesis (Masters)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-5865 Telecommunication. Telegraph.
ID Code:8825
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:02 Feb 2017 11:28
Last Modified:02 Feb 2017 11:28

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