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  • 1
    Online Resource
    Online Resource
    Transporting 8 × 10 Gbps WDM Ro-FSO Under Various Weather Conditions
    Walter de Gruyter GmbH ; 2019
    In:  Journal of Optical Communications Vol. 41, No. 1 ( 2019-12-18), p. 99-105
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 41, No. 1 ( 2019-12-18), p. 99-105
    Abstract: Radio overfree space optics (Ro-FSO) is a modern communication technique that promises a development future. In this paper, WDM Ro-FSO communication system has designed (10 Gbps×8λ) for transmissions 80 Gbps data rate via the largest possible distance under clear air, heavy rain, and heavy fog atmosphere conditions of FSO link, with test the best wavelengths performance of (193.1 to 93.8) THz that each one (wavelength) carry 10 Gbps by employ BER analyzer at receiver channels. The electric signals produced by phase shift keying (PSK) modulation technique modulated the information (10 Gbps) on RF signal (20 GHz). The results of transporting 80 Gbps were 5 km under clear air weather condition, 1.2 km under heavy rain, and 0.2 km under heavy fog condition. Finally, the different wavelengths that carry high-value data rate are tested by measurement of the BER and Q factor for each received channel, and the theoretical model of PSK modulation is analyzed.
    Type of Medium: Online Resource
    ISSN: 2191-6322 , 0173-4911
    URL: Article
    DOI: 10.1515/joc-2017-0140
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2019
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  • 2
    Online Resource
    Online Resource
    Investigation of radiation induced luminescence with modulated signal transmission in optical fiber
    Walter de Gruyter GmbH ; 2021
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2021-04-13)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2021-04-13)
    Abstract: In this work, the effect of mixed beta and gamma radiation on the optical fiber properties was investigated, this effect has been studied for different signal frequencies which range 1–100 kHz carrying on laser beam using amplitude shift key (ASK). Single mode (SM) glass optical fiber was utilized, and exposed by (Cs-137) as radioactive point source with different low dose rates. The variation of received optical power ( P r ), peak to peak voltage ( Vp-p ), voltage gain ( A v ), and signal to noise ratio (SNR) were measured before and after irradiation. It was observed that an improvement in the received signals which propagates in optical fiber after irradiation by exposure of lower dose rates.
    Type of Medium: Online Resource
    ISSN: 2191-6322 , 0173-4911
    URL: Article
    DOI: 10.1515/joc-2020-0287
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
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  • 3
    Online Resource
    Online Resource
    Theoretical investigation of multiple input–multiple output (MIMO) technique for line of sight (LoS) underwater wireless optical communications system
    Walter de Gruyter GmbH ; 2021
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2021-02-18)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2021-02-18)
    Abstract: In this paper, a theoretical investigation was suggested to study underwater wireless optical communication (UWOC) system based on multiple input–multiple output (MIMO) technique. The modulation schemes such as RZ-OOK, NRZ-OOK, 32-PPM and 4-QAM applied under different coastal water types. MIMO technique enabled the system to transmit data rate with longer distance link. The performance of the proposed system examined by BER and data rate as a metrics. Several impairments such as the types of water by the attenuation of coastal water and the distance link were taken into account for the transmission of the optical signal to appreciate the reliability of the MIMO technique. The theoretical analysis shows the proposed of MIMO (4Tx/4Rx) technique get the better performance compared with the other techniques in terms of BER. When 32-PPM is applied as a modulation scheme. For the system with MIMO technique the maximum distance link arrive to 14.9 and 2.9 m for coastal water types JIC and J9C, respectively. While SISO (1Tx/1Rx) technique achieved the maximum distance link are 10 and 2.3 m for coastal water types JIC and J9C, respectively. Therefore, 32-PPM can outperform the other modulation schemes and consider the suitable option for obtaining a low BER with the best maximum distance link for LoS of MIMO technique.
    Type of Medium: Online Resource
    ISSN: 0173-4911 , 2191-6322
    URL: Article
    DOI: 10.1515/joc-2020-0297
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
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  • 4
    Online Resource
    Online Resource
    Underwater wireless optical communication: a case study of chlorophyll effect
    Walter de Gruyter GmbH ; 2021
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2021-05-03)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2021-05-03)
    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.
    Type of Medium: Online Resource
    ISSN: 2191-6322 , 0173-4911
    URL: Article
    DOI: 10.1515/joc-2020-0139
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Underwater wireless optical communications links: perspectives, challenges and recent trends
    Walter de Gruyter GmbH ; 2022
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2022-08-17)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2022-08-17)
    Abstract: Underwater wireless optical communication (UOWC) systems have lately garnered a significant amount of attention for both academic purposes and trial applications. Although the idea is not new, the fact that seawater has a smaller window of absorption for blue-green light has reawakened interest in it, and it has grown an essential attraction because of its high bandwidth, it can cover a wide variety of underwater activities as compared to radio frequency and acoustic technologies. To monitor pollution, maintain oil pipelines, monitor climate change, conduct offshore investigations, and conduct oceanography research, the wireless transmission of information underwater technology is of importance to the military, industrial, and scientific organizations all around the world. The use of wavelengths of visible light to transmit secure data across point-to-point connections in underwater optical wireless communication (UOWC) compares well with the usage of free-space optical (FSO) communications. However, UWOC systems also have a huge amount of absorption and scattering introduced by the aquatic channels. Different from standard terrestrial free-space optical communication, many unique system design strategies have been investigated in recent years to solve these technological issues. This article presents a vision as well as various obstacles in the domain of underwater optical wireless communication, a detailed overview, and comparison of underwater communications techniques (UOWC) links, basic modulation technique techniques, and c pursuits on UWOC.
    Type of Medium: Online Resource
    ISSN: 0173-4911 , 2191-6322
    URL: Article
    DOI: 10.1515/joc-2022-0063
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
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  • 6
    Online Resource
    Online Resource
    Hybrid RF/FSO communication system in dust attenuation link
    Walter de Gruyter GmbH ; 2023
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2023-07-10)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2023-07-10)
    Abstract: FSO systems have unlimited bandwidth and unlicensed availability, which makes them an attractive low-cost solution. Because the wavelength of the signal is close to the diameter of the dust particles, they have an impact on the FSO link by reducing its availability and causing its interruption. To solve this, a hybrid system of two RF/FSO links to avoid transmission interruption is necessary because the effect of dust on the RF links is slight because of their large wavelength compared to the size of the dust particle. In this paper, hybrid RF/FSO links are simulated and investigated under dusty conditions. The BER, Q-factor, and data rate are calculated for 2, 10, and 25 GHz of RF link. Besides, the wavelength of 1550 nm is used for the FSO link. The results produced at 10 and 25 GHz are suitable for wireless communication. So, it is the best link to use as a backup link with the FSO system. The performance of 1550 nm is poorer. The lower frequency of the RF link (2 GHz) has a similar link with the FSO. Under different dust conditions, the transmission rate is enhanced by a 25 GHz link. The link distance is reduced by decreasing the visibility of the weather.
    Type of Medium: Online Resource
    ISSN: 0173-4911 , 2191-6322
    URL: Article
    DOI: 10.1515/joc-2023-0104
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2023
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  • 7
    Online Resource
    Online Resource
    Analyzing of UVLC system considering the effect of water depth
    Walter de Gruyter GmbH ; 2021
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2021-04-20)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2021-04-20)
    Abstract: This paper presents a new approach to discover the effect of depth water for underwater visible light communications (UVLC). The quality of the optical link was investigated with varying water depth under coastal water types. The performance of the UVLC with multiple input–multiple output (MIMO) techniques was examined in terms of bit error rate (BER) and data rate. The theoretical result explains that there is a good performance for UVLC system under coastal water.
    Type of Medium: Online Resource
    ISSN: 2191-6322 , 0173-4911
    URL: Article
    DOI: 10.1515/joc-2021-0030
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2021
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  • 8
    Online Resource
    Online Resource
    Underwater wireless optical communication utilizing multiple input–multiple output (MIMO)-LED system for RF transmission with solar panel receiver
    Walter de Gruyter GmbH ; 2022
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2022-06-15)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2022-06-15)
    Abstract: In this article, we designed an experimental system for underwater wireless optical communications. A function generation device sent frequencies (1–500 kHz) by amplitude shift key modulation technology, and these frequencies were loaded over light-emitting diode to propagate through a glass water tank with a length of 1 m, width of 40 cm, and height of 30 cm containing clean water of 80 L. These frequencies were received by a photodiode (BPX61), and the received signal was displayed through a digital storage oscilloscope device. Four techniques, single input–single output (SISO), single input–multiple output, multiple input–single output, and multiple input–multiple output (MIMO), were applied under the same optical conditions to know the quality of receiving the optical signal and the difference between them. Finally, the parameter values of signal-to-noise ratio, peak-to-peak voltage, and voltage gain were checked for each technique, and they were the lowest values for the SISO technique and the highest values for the MIMO technique.
    Type of Medium: Online Resource
    ISSN: 2191-6322 , 0173-4911
    URL: Article
    DOI: 10.1515/joc-2022-0011
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2022
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  • 9
    Online Resource
    Online Resource
    Performance of hybrid RF/FSO wireless communication system under low visibility
    Walter de Gruyter GmbH ; 2023
    In:  Journal of Optical Communications Vol. 0, No. 0 ( 2023-05-05)
    Details
    In: Journal of Optical Communications, Walter de Gruyter GmbH, Vol. 0, No. 0 ( 2023-05-05)
    Abstract: In the last ten years, there has been a significant increase in the importance of free-space optics (FSO). FSO can be a solution for the last mile, but its reliability and availability issues need to be looked into in depth before they can be fixed. Because FSO links depend so much on the weather, a number of weather-related issues reduce their availability. A hybrid network with an FSO link and a backup link in the GHz frequency band offers good availability and data speeds that are similar to those of a pure FSO network. Fog’s effects on hybrid RF/FSO systems are investigated. As a backup link, the GHz frequencies with the best complementing behavior should be used. The findings demonstrated that high temperatures had no adverse effects on the RF at 25 GHz in terms of impaired visibility. Despite the cold weather, the FSO link required excellent visibility.
    Type of Medium: Online Resource
    ISSN: 0173-4911 , 2191-6322
    URL: Article
    DOI: 10.1515/joc-2023-0078
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2023
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  • 10
    Online Resource
    Online Resource
    Elemental analysis of gallstone samples by utilizing LIBS and ICP-MS approaches
    Springer Science and Business Media LLC ; 2023
    In:  Journal of Optics
    Details
    In: Journal of Optics, Springer Science and Business Media LLC
    Type of Medium: Online Resource
    ISSN: 0972-8821 , 0974-6900
    URL: Article
    DOI: 10.1007/s12596-023-01385-6
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2023
    detail.hit.zdb_id: 2533862-6
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