Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization
A data clipping and normalization technique is employed to improve the performance of the overall direct detection optical orthogonal frequency division multiplexing (DCO-OFDM) system. A detailed analysis of clipping distortion introduced by digital clipping and normalization is provided. The normal...
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| Format: | Article |
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Wiley
2018-01-01
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| Series: | Journal of Electrical and Computer Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/1839403 |
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| author | Jiang Wu Zhongpeng Wang |
| author_facet | Jiang Wu Zhongpeng Wang |
| author_sort | Jiang Wu |
| collection | DOAJ |
| description | A data clipping and normalization technique is employed to improve the performance of the overall direct detection optical orthogonal frequency division multiplexing (DCO-OFDM) system. A detailed analysis of clipping distortion introduced by digital clipping and normalization is provided. The normalization operation amplifies the clipped data signal to the maximum input amplitude of a digital-to-analog converter (DAC). Based on the analysis, a BER formula of the proposed scheme is derived over the AWGN channel and single fiber channel. Performance of an optical clipped OFDM with normalization is assessed through numerical simulations and Monte Claro simulation over the AWGN channel. Theoretical analysis and simulation results both show that the clipping and normalization scheme can greatly improve the BER of an optical OFDM. In particular, BER performance of the proposed transmission scheme was measured in a practical OFDM transmission platform. The measured experimental results show that the clipped and amplified OFDM signal exhibits superior performance in comparison with the conventional OFDM signal. The received sensitivity at a BER of 10−3 for a 4 Gsamples/s (2.6667 Gbits/s) clipped and normalized OFDM signal with clipping ratio of 4 after 100 km standard single-mode fiber (SMF) transmission was improved by 4.3 dB when compared with the conventional OFDM system. The measured results also showed that the clipped OFDM signal exhibits superior performance in comparison with the conventional OFDM signal. Therefore, a clipping and normalization at the transmitter is most effective, and a substantial performance improvement can be obtained by a simple normalization after clipping. |
| format | Article |
| id | doaj-art-e92bb197f395449a9d9eea068be71a38 |
| institution | DOAJ |
| issn | 2090-0147 2090-0155 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Electrical and Computer Engineering |
| spelling | doaj-art-e92bb197f395449a9d9eea068be71a382025-08-20T03:21:09ZengWileyJournal of Electrical and Computer Engineering2090-01472090-01552018-01-01201810.1155/2018/18394031839403Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and NormalizationJiang Wu0Zhongpeng Wang1School of Information, Zhejiang Sci-Tech University, Hangzhou 310023, ChinaSchool of Information and Electronic Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, ChinaA data clipping and normalization technique is employed to improve the performance of the overall direct detection optical orthogonal frequency division multiplexing (DCO-OFDM) system. A detailed analysis of clipping distortion introduced by digital clipping and normalization is provided. The normalization operation amplifies the clipped data signal to the maximum input amplitude of a digital-to-analog converter (DAC). Based on the analysis, a BER formula of the proposed scheme is derived over the AWGN channel and single fiber channel. Performance of an optical clipped OFDM with normalization is assessed through numerical simulations and Monte Claro simulation over the AWGN channel. Theoretical analysis and simulation results both show that the clipping and normalization scheme can greatly improve the BER of an optical OFDM. In particular, BER performance of the proposed transmission scheme was measured in a practical OFDM transmission platform. The measured experimental results show that the clipped and amplified OFDM signal exhibits superior performance in comparison with the conventional OFDM signal. The received sensitivity at a BER of 10−3 for a 4 Gsamples/s (2.6667 Gbits/s) clipped and normalized OFDM signal with clipping ratio of 4 after 100 km standard single-mode fiber (SMF) transmission was improved by 4.3 dB when compared with the conventional OFDM system. The measured results also showed that the clipped OFDM signal exhibits superior performance in comparison with the conventional OFDM signal. Therefore, a clipping and normalization at the transmitter is most effective, and a substantial performance improvement can be obtained by a simple normalization after clipping.http://dx.doi.org/10.1155/2018/1839403 |
| spellingShingle | Jiang Wu Zhongpeng Wang Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization Journal of Electrical and Computer Engineering |
| title | Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization |
| title_full | Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization |
| title_fullStr | Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization |
| title_full_unstemmed | Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization |
| title_short | Theoretical and Experimental Investigation of Direct Detection Optical OFDM Systems with Clipping and Normalization |
| title_sort | theoretical and experimental investigation of direct detection optical ofdm systems with clipping and normalization |
| url | http://dx.doi.org/10.1155/2018/1839403 |
| work_keys_str_mv | AT jiangwu theoreticalandexperimentalinvestigationofdirectdetectionopticalofdmsystemswithclippingandnormalization AT zhongpengwang theoreticalandexperimentalinvestigationofdirectdetectionopticalofdmsystemswithclippingandnormalization |