Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation
For the fronthaul link in the fifth-generation (5G) wireless networks, optical fiber is one of the most widely used medium, owing to its large bandwidth and low transmission loss. However, in some scenarios, especially the dense urban areas, the installation of fiber optic cables is costly and diffi...
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9947347/ |
| _version_ | 1811319122746671104 |
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| author | Xueyuan Ao Qirun Fan Linsheng Zhong Tianjin Mei Yuanxiang Wang Qi Yang Xiaoxiao Dai Chen Liu Mengfan Cheng Lei Deng Deming Liu |
| author_facet | Xueyuan Ao Qirun Fan Linsheng Zhong Tianjin Mei Yuanxiang Wang Qi Yang Xiaoxiao Dai Chen Liu Mengfan Cheng Lei Deng Deming Liu |
| author_sort | Xueyuan Ao |
| collection | DOAJ |
| description | For the fronthaul link in the fifth-generation (5G) wireless networks, optical fiber is one of the most widely used medium, owing to its large bandwidth and low transmission loss. However, in some scenarios, especially the dense urban areas, the installation of fiber optic cables is costly and difficult to establish. Alternatively, the free space optical (FSO) link can be installed easily and spans complex terrain. In this context, we propose and experimentally demonstrate a hybrid FSO/Wireless transmission system based on bandpass delta-sigma modulator and real-time coherent transponder. Advantage of the proposed technique is twofold. Firstly, coherent detection is applied to improve the system sensitivity compared to conventional direct detection. Secondly, delta-sigma modulation (DSM) is utilized to greatly simplify the wireless transmitters and to enhance the bandwidth flexibility. Over a 50-m FSO and 1-m wireless link, a 64-QAM wireless signal at 1 GHz with 500 MHz bandwidth is successfully transmitted. With 16 wavelength division multiplexing channels, the total throughput of the system is up to 24 Gb/s. Meanwhile, the error vector magnitude (EVM) of all channels is around 2.68% and 6.51%, which are demonstrated after FSO and FSO/Wireless transmission, respectively. The results meet the requirement of the third-generation partnership project release 15 with EVM value of 8% for 64-QAM. Moreover, sensitivity of the real-time coherent receiver is lower than −48 dBm under the 7% forward error correction limit with bit error rate of 3.8e-3. |
| first_indexed | 2024-04-13T12:37:27Z |
| format | Article |
| id | doaj.art-bbd6b60e5d7b4cc2be8a38fb9311279b |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-04-13T12:37:27Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-bbd6b60e5d7b4cc2be8a38fb9311279b2022-12-22T02:46:37ZengIEEEIEEE Photonics Journal1943-06552022-01-011461810.1109/JPHOT.2022.32195589947347Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma ModulationXueyuan Ao0https://orcid.org/0000-0002-3244-5915Qirun Fan1Linsheng Zhong2https://orcid.org/0000-0002-5737-499XTianjin Mei3Yuanxiang Wang4Qi Yang5https://orcid.org/0000-0001-9017-6971Xiaoxiao Dai6https://orcid.org/0000-0003-3408-7493Chen Liu7https://orcid.org/0000-0003-2000-8133Mengfan Cheng8https://orcid.org/0000-0002-8221-0612Lei Deng9https://orcid.org/0000-0003-2647-4610Deming Liu10https://orcid.org/0000-0001-5591-2929School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaSchool of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, ChinaFor the fronthaul link in the fifth-generation (5G) wireless networks, optical fiber is one of the most widely used medium, owing to its large bandwidth and low transmission loss. However, in some scenarios, especially the dense urban areas, the installation of fiber optic cables is costly and difficult to establish. Alternatively, the free space optical (FSO) link can be installed easily and spans complex terrain. In this context, we propose and experimentally demonstrate a hybrid FSO/Wireless transmission system based on bandpass delta-sigma modulator and real-time coherent transponder. Advantage of the proposed technique is twofold. Firstly, coherent detection is applied to improve the system sensitivity compared to conventional direct detection. Secondly, delta-sigma modulation (DSM) is utilized to greatly simplify the wireless transmitters and to enhance the bandwidth flexibility. Over a 50-m FSO and 1-m wireless link, a 64-QAM wireless signal at 1 GHz with 500 MHz bandwidth is successfully transmitted. With 16 wavelength division multiplexing channels, the total throughput of the system is up to 24 Gb/s. Meanwhile, the error vector magnitude (EVM) of all channels is around 2.68% and 6.51%, which are demonstrated after FSO and FSO/Wireless transmission, respectively. The results meet the requirement of the third-generation partnership project release 15 with EVM value of 8% for 64-QAM. Moreover, sensitivity of the real-time coherent receiver is lower than −48 dBm under the 7% forward error correction limit with bit error rate of 3.8e-3.https://ieeexplore.ieee.org/document/9947347/Free space optical communication5G wireless transmissionreal-time coherent receiverdelta-sigma modulation |
| spellingShingle | Xueyuan Ao Qirun Fan Linsheng Zhong Tianjin Mei Yuanxiang Wang Qi Yang Xiaoxiao Dai Chen Liu Mengfan Cheng Lei Deng Deming Liu Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation IEEE Photonics Journal Free space optical communication 5G wireless transmission real-time coherent receiver delta-sigma modulation |
| title | Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation |
| title_full | Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation |
| title_fullStr | Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation |
| title_full_unstemmed | Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation |
| title_short | Real-Time Experimental Demonstration of Hybrid FSO/Wireless Transmission Based on Coherent Detection and Delta-Sigma Modulation |
| title_sort | real time experimental demonstration of hybrid fso x002f wireless transmission based on coherent detection and delta sigma modulation |
| topic | Free space optical communication 5G wireless transmission real-time coherent receiver delta-sigma modulation |
| url | https://ieeexplore.ieee.org/document/9947347/ |
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