Underwater wireless optical communication: a case study of chlorophyll effect

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Haitham Mawlood Mikhlif ◽  
Mazin Ali A. Ali ◽  
Zeyad A. Saleh
Keyword(s):  
Optical Communication ◽  
Fluorescence Spectra ◽  
Signal To Noise Ratio ◽  
Link Quality ◽  
Optical Communication System ◽  
Absorption And Fluorescence Spectra ◽  
Peak Voltage ◽  
Wireless Optical Communication ◽  
Received Power

Abstract In this paper, a system was designed to simulate the study and analyze the effect of chlorophyll on the underwater wireless optical communication system. Chlorophyll was extracted and characterized by measuring absorption and fluorescence spectra, the performance of system was observed by mixing various volumes added to water. The optical beam was modulated at different frequencies by the frequency shift key, once through clean water and once through water mixed with chlorophyll and different metrics such as received power (P r ), attenuation coefficient (α), peak-to-peak voltage (V p-p), voltage gain (A v ), and signal-to-noise ratio were measured to assess the performance of the system. The results refer that the system exhibits a good link quality to the received frequencies under different conditions.

Performance of LED for line-of-sight (LoS) underwater wireless optical communication system

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Alaa G. Nasser ◽  
Mazin Ali A. Ali
Keyword(s):  
Optical Communication ◽  
Link Quality ◽  
Line Of Sight ◽  
Modulation Scheme ◽  
Underwater Communication ◽  
Optical Communication System ◽  
High Data ◽  
Wireless Optical Communication ◽  
Noise Rate ◽  
Wireless Optical Communications

AbstractUnderwater wireless optical communications (UWOC) recently emerge as a solution to the problem of underwater communication for link with a high data rate, low delay, safety, and high immunity. In this study, the line of sight (LoS) method based on LED used for UWOC with different modulation schemes. The bit error rate (BER), signal-to-noise rate, and quality factor are used for assessing system performance and link quality. Besides the effect of transmitting angle, distance link (d), and transmitting power (PT) are analysed. Results show that 8-pulse position modulation (PPM) is the best modulation scheme for achieving a good link in the LoS method.

scholarly journals Experimental Study of Underwater Wireless Optical Communication from Clean Water to Turbid Harbor under Various Conditions

2021 ◽  
Vol 16 (2) ◽  
pp. 219-226
Author(s):  
Salah A. Adnan ◽  
Hassan Ahmed Hassan ◽  
Ahmed Alchalaby ◽  
Ahmed C. Kadhim
Keyword(s):  
Optical Communication ◽  
Pulse Width Modulation ◽  
Signal To Noise Ratio ◽  
Slope Angle ◽  
Optical Power ◽  
High Concentration ◽  
Wireless Optical Communication ◽  
Received Power ◽  
Harbour Water ◽  
Mathematical Equations

In this paper, texts were experimentally transmitted by pulse width modulation (PWM) using an underwater wireless optical communication system (UWOC) in a channel containing water of varying salinity as a result of changes in the concentration of sodium chloride (NaCl). Mathematical equations are used using a MATLAB program to compare theoretical and practical results at different slop angle (θ0). (NaCl) concentration was changed from (0% w/v) to (90% w/v) to achieve different salinity of water (i.e., from clear water to turbid water). A diode laser with a power of 30 mW and a wavelength of 532 nm has been employed in the transmitter. The experimental results show that the extinction coefficient or the overall attenuation C(λ) is equal to (0.083/m) in the water containing a low concentration of (NaCl) which is consistent with pure seawater. Additionally, the obtained optical power (PR) and the signal to noise ratio (S/N) decreases to (27.6) mW and (23.99) dB, respectively. Furthermore, it was found that the water had a maximum total attenuation C(λ) equal to (2.565/m) in the water containing a high concentration of (NaCl) which was compatible with turbid harbour water, as well as the received power and (S/N) decreases to (2.306) mW and (13.2) dB, respectively. The theoretical results were similar to the practical results when the slope angle of the target or detector relative to the optical transmitter was (zero).

OFDM-based broadband underwater wireless optical communication system using a compact blue LED

2016 ◽  
Vol 369 ◽  
pp. 100-105 ◽  
Author(s):  
Jing Xu ◽  
Meiwei Kong ◽  
Aobo Lin ◽  
Yuhang Song ◽  
Xiangyu Yu ◽  
...  
Keyword(s):  
Optical Communication ◽  
Communication System ◽  
Optical Communication System ◽  
Blue Led ◽  
Wireless Optical Communication

scholarly journals A BRIEF SURVEY ON UNDERWATER WIRELESS OPTICAL COMMUNICATION SYSTEM

2018 ◽  
Vol 6 (6) ◽  
pp. 238-245
Author(s):  
Amayika Kakati ◽  
Deeksha Sharma ◽  
Nikhil N Aggarwal
Keyword(s):  
Optical Communication ◽  
Data Transmission ◽  
Water Environment ◽  
High Rate ◽  
Electromagnetic Spectrum ◽  
Optical Communication System ◽  
Water Types ◽  
Inherent Optical Properties ◽  
Wireless Optical Communication ◽  
Very High

The underwater wireless optical communication (UWOC) system gives very high rate of underwater data transmission over several meters. It utilizes the visible band in the spectral range of 390-750nm of the electromagnetic spectrum. In this paper, we study various types of link configurations depending upon the circumstances in water environment. We also study the effect of various water types on the system performance. We find that the UWOC system is affected especially by inherent optical properties such as absorption and scattering and the effect of these properties is different in various water types. We also present that misalignment in UOWC system adversely affects its functioning and reliability. Finally, we present that hybrid system design for a proper systematic UOWC system.

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