Joudha, M., Hmood, J., Adnan, S. (2023). Performance Analysis of Underwater Optical Communication System in Turbulent Link. Alustath, 41(8), 1082-1090. doi: 10.30684/etj.2023.138423.1393
Murtadha M. Joudha; Jassim K. Hmood; Salah A. Adnan. "Performance Analysis of Underwater Optical Communication System in Turbulent Link". Alustath, 41, 8, 2023, 1082-1090. doi: 10.30684/etj.2023.138423.1393
Joudha, M., Hmood, J., Adnan, S. (2023). 'Performance Analysis of Underwater Optical Communication System in Turbulent Link', Alustath, 41(8), pp. 1082-1090. doi: 10.30684/etj.2023.138423.1393
Joudha, M., Hmood, J., Adnan, S. Performance Analysis of Underwater Optical Communication System in Turbulent Link. Alustath, 2023; 41(8): 1082-1090. doi: 10.30684/etj.2023.138423.1393

Performance Analysis of Underwater Optical Communication System in Turbulent Link

Engineering and Technology Journal
Volume 41, Issue 8, August 2023, Pages 1082-1090    PDF (867.83 K)
Document Type: Research Paper
DOI: 10.30684/etj.2023.138423.1393
Authors
Murtadha M. Joudha; Jassim K. Hmood; Salah A. Adnan*
Laser and Optoelectronic Engineering Dept., University of Technology-Iraq, Alsina’a street, 10066 Baghdad, Iraq.
Abstract
Underwater wireless optical communication (UWOC) systems have been identified as a suitable replacement technology with high data rates over relatively medium transmission ranges for underwater communication. In the research, we propose a new optical hybrid modulation format for carrying the letters over underwater wireless optical communication (UWOC) system. This hybrid modulation format combines pulse position modulation (PPM) with digital pulse interval modulation (DPIM) to increase the transporting speed. The proposed UWOC system is experimentally investigated in the laboratory over a clean and turbulent water channel. The message was electrically modulated in the transmitter with PPM-DPIM format and then applied to a laser diode. The laser diode emitted light at a wavelength of 650 nm with a power of 60 mW. At the receiver, the photodiode, with its amplifier circuits, sends the received signal to the microprocessor to restore the origin message. The results showed that the received power and signal-to-noise ratio (SNR) decreased with elongating the transmission distance. In addition, the attenuation is raised with increasing distance. The bubbles source is also situated at distances of 25 cm, 50 cm, and 75 cm from the transmitter in turbulent waters. The results showed that locating the bubble source decreases the system's performance. The best results were obtained when the bubble source was 75 cm away from the transmitter. Finally, the hybrid modulation formats (PPM-DPIM) can increase the speed of letter transmission, reduce the bit error rate (BER), and minimize the effect of scattering and attenuation in water channels.

Highlights
  • Implementing PWM-PPM was better than PWM for 650nm and 60mw laser diode.
  • The attenuation in turbulent water due to bubbles has been higher than that in clear water.
  • The attenuation decreases as the bubbles move away from the transmitter.
  • The letter "e" was the highest SNR, while letter "a" was the lowest SNR.
Keywords
Underwater wireless optical communication system Pulse position modulation Digital pulse interval modulation Signal; to; noise ratio Symbol error rate and attenuation
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