Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters
Underwater wireless optical communication (UWOC) has been considered a promising technology for high-speed underwater transmission. Some Gb/s level UWOC systems applying visible light have been demonstrated with a transmission distance of several meters or more. Many of the previous works focus on t...
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| Format: | Article |
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MDPI AG
2021-03-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/8/3/74 |
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| author | Dong-Chang Li Chia-Chun Chen Shien-Kuei Liaw Shofuro Afifah Jiun-Yu Sung Chien-Hung Yeh |
| author_facet | Dong-Chang Li Chia-Chun Chen Shien-Kuei Liaw Shofuro Afifah Jiun-Yu Sung Chien-Hung Yeh |
| author_sort | Dong-Chang Li |
| collection | DOAJ |
| description | Underwater wireless optical communication (UWOC) has been considered a promising technology for high-speed underwater transmission. Some Gb/s level UWOC systems applying visible light have been demonstrated with a transmission distance of several meters or more. Many of the previous works focus on the advanced technologies to push the systems’ capacity–distance performance. However, practical environmental factors issue such as flow turbulence and temperature variation are seldom studied through specific statistical/theoretical models. In this paper, a UWOC system using a 450 nm blue light laser source was set up using a 1.5-m water tank with mirrors located on both sides for single or multiple reflections corresponding to different transmission distances. The blue laser was modulated by a 1.25 Gbps NRZ-OOK format with PRBS of 7, 24 or 31, respectively, for system performance comparison. The bit error rate (BER) values were measured in 1.5, 3.0 and 6 m, respectively, for system evaluation. At room temperature, the BER value was down to 10 × 10<sup>−8</sup> for a 1.25 Gbps data rate in a 6 m transmission. Then, the UWOC transmission system experiment was carried out under several environmental parameters such as temperature, turbulence, artificial seawater by adding salt to simulate practical application in river or sea. When a submerged motor with an output of 1200 L/h was used as a water flow turbulence source, the impact to BER and transmission quality was negligible. For the temperature change issue, the experiment shows that around the original temperature of 25 °C had the best BER as compared to other temperature ranges from 10 to 50 °C. For artificial seawater issues by adding salt to simulate the real seawater environment. The transmission distance was only 3-m instead of 6 m, mainly due to particle scattering and water disturbance. With the motor pump on, the power penalty was 1 dB at 10 × 10<sup>−8</sup> BER when compared to the motor pump off. |
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| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-10T13:20:19Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-6d27eef639a54b04b82c2c5e758b4af42023-11-21T10:02:27ZengMDPI AGPhotonics2304-67322021-03-01837410.3390/photonics8030074Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental ParametersDong-Chang Li0Chia-Chun Chen1Shien-Kuei Liaw2Shofuro Afifah3Jiun-Yu Sung4Chien-Hung Yeh5Department of Electronics and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106335, TaiwanDepartment of Electronics and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106335, TaiwanDepartment of Electronics and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106335, TaiwanGraduate Institute of Electro-Optical Engineering, National Taiwan University of Science and Technology, Taipei 106335, TaiwanDepartment of Electronics and Computer Engineering, National Taiwan University of Science and Technology, Taipei 106335, TaiwanDepartment of Photonics, Feng Chia University, Taichung 40724, TaiwanUnderwater wireless optical communication (UWOC) has been considered a promising technology for high-speed underwater transmission. Some Gb/s level UWOC systems applying visible light have been demonstrated with a transmission distance of several meters or more. Many of the previous works focus on the advanced technologies to push the systems’ capacity–distance performance. However, practical environmental factors issue such as flow turbulence and temperature variation are seldom studied through specific statistical/theoretical models. In this paper, a UWOC system using a 450 nm blue light laser source was set up using a 1.5-m water tank with mirrors located on both sides for single or multiple reflections corresponding to different transmission distances. The blue laser was modulated by a 1.25 Gbps NRZ-OOK format with PRBS of 7, 24 or 31, respectively, for system performance comparison. The bit error rate (BER) values were measured in 1.5, 3.0 and 6 m, respectively, for system evaluation. At room temperature, the BER value was down to 10 × 10<sup>−8</sup> for a 1.25 Gbps data rate in a 6 m transmission. Then, the UWOC transmission system experiment was carried out under several environmental parameters such as temperature, turbulence, artificial seawater by adding salt to simulate practical application in river or sea. When a submerged motor with an output of 1200 L/h was used as a water flow turbulence source, the impact to BER and transmission quality was negligible. For the temperature change issue, the experiment shows that around the original temperature of 25 °C had the best BER as compared to other temperature ranges from 10 to 50 °C. For artificial seawater issues by adding salt to simulate the real seawater environment. The transmission distance was only 3-m instead of 6 m, mainly due to particle scattering and water disturbance. With the motor pump on, the power penalty was 1 dB at 10 × 10<sup>−8</sup> BER when compared to the motor pump off.https://www.mdpi.com/2304-6732/8/3/74underwater wireless optical communicationbit error ratetemperatureturbulenceartificial seawaterenvironmental factors |
| spellingShingle | Dong-Chang Li Chia-Chun Chen Shien-Kuei Liaw Shofuro Afifah Jiun-Yu Sung Chien-Hung Yeh Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters Photonics underwater wireless optical communication bit error rate temperature turbulence artificial seawater environmental factors |
| title | Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters |
| title_full | Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters |
| title_fullStr | Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters |
| title_full_unstemmed | Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters |
| title_short | Performance Evaluation of Underwater Wireless Optical Communication System by Varying the Environmental Parameters |
| title_sort | performance evaluation of underwater wireless optical communication system by varying the environmental parameters |
| topic | underwater wireless optical communication bit error rate temperature turbulence artificial seawater environmental factors |
| url | https://www.mdpi.com/2304-6732/8/3/74 |
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