Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission
High sampling-rate digital-to-analog converters (DAC) are usually applied in optical fiber communication systems for the signal generation with advanced modulation formats such as four-level pulse amplitude modulation (PAM4). There exist various imperfections for high sampling-rate DACs. Clock tone...
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IEEE
2020-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9089294/ |
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| author | Ming Chen Long Zhang Hui Zhou Qinghui Chen |
| author_facet | Ming Chen Long Zhang Hui Zhou Qinghui Chen |
| author_sort | Ming Chen |
| collection | DOAJ |
| description | High sampling-rate digital-to-analog converters (DAC) are usually applied in optical fiber communication systems for the signal generation with advanced modulation formats such as four-level pulse amplitude modulation (PAM4). There exist various imperfections for high sampling-rate DACs. Clock tone leakage (CTL) is one of the imperfections and may seriously degrade the bit error rate (BER) performance, especially for single-carrier transmission systems. In this paper, we study a low-complexity time-domain averaging (TDA) based CTL compensation (TDA-CTLC) method for short-reach PAM4 transmission. By numerical simulation, we investigate the impacts of chromatic dispersion, CTL interference-to-signal power ratio (ISPR), and vertical resolution of the analog-to-digital converter on the BER performance. The results exhibit that the TDA-CTLC enabled PAM4 transmission system in the presence of a wide range of ISPR has a similar BER performance with the one without CTL interference. Moreover, we experimentally evaluate the compensation performance of the TDA-CTLC in a directly-modulated laser-based short-reach PAM4 transmission system. Up to −4 dB ISPR can be compensated with a slight BER performance degradation due to nonlinear distortions. |
| format | Article |
| id | doaj-art-e808c13d78004325a5cbb12ece636523 |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
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| series | IEEE Photonics Journal |
| spelling | doaj-art-e808c13d78004325a5cbb12ece6365232025-08-20T03:32:33ZengIEEEIEEE Photonics Journal1943-06552020-01-0112311410.1109/JPHOT.2020.29930469089294Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 TransmissionMing Chen0https://orcid.org/0000-0001-8860-7023Long Zhang1https://orcid.org/0000-0003-4199-1106Hui Zhou2https://orcid.org/0000-0002-8564-3851Qinghui Chen3https://orcid.org/0000-0003-4840-4875School of Physics and Electronics, Hunan Normal University, Changsha, ChinaSchool of Physics and Electronics, Hunan Normal University, Changsha, ChinaCollege of Information Science and Engineering, Hunan Normal University, Changsha, ChinaCollege of Computer and Communication, Hunan University of Technology, Zhuzhou, ChinaHigh sampling-rate digital-to-analog converters (DAC) are usually applied in optical fiber communication systems for the signal generation with advanced modulation formats such as four-level pulse amplitude modulation (PAM4). There exist various imperfections for high sampling-rate DACs. Clock tone leakage (CTL) is one of the imperfections and may seriously degrade the bit error rate (BER) performance, especially for single-carrier transmission systems. In this paper, we study a low-complexity time-domain averaging (TDA) based CTL compensation (TDA-CTLC) method for short-reach PAM4 transmission. By numerical simulation, we investigate the impacts of chromatic dispersion, CTL interference-to-signal power ratio (ISPR), and vertical resolution of the analog-to-digital converter on the BER performance. The results exhibit that the TDA-CTLC enabled PAM4 transmission system in the presence of a wide range of ISPR has a similar BER performance with the one without CTL interference. Moreover, we experimentally evaluate the compensation performance of the TDA-CTLC in a directly-modulated laser-based short-reach PAM4 transmission system. Up to −4 dB ISPR can be compensated with a slight BER performance degradation due to nonlinear distortions.https://ieeexplore.ieee.org/document/9089294/Clock tone leakage (CTL)Digital-to-analog converter (DAC)pulse amplitude modulation (PAM)time-domain averaging (TDA) |
| spellingShingle | Ming Chen Long Zhang Hui Zhou Qinghui Chen Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission IEEE Photonics Journal Clock tone leakage (CTL) Digital-to-analog converter (DAC) pulse amplitude modulation (PAM) time-domain averaging (TDA) |
| title | Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission |
| title_full | Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission |
| title_fullStr | Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission |
| title_full_unstemmed | Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission |
| title_short | Low-Complexity Time-Domain Averaging-Based DAC Clock Tone Leakage Compensation for Short-Reach PAM4 Transmission |
| title_sort | low complexity time domain averaging based dac clock tone leakage compensation for short reach pam4 transmission |
| topic | Clock tone leakage (CTL) Digital-to-analog converter (DAC) pulse amplitude modulation (PAM) time-domain averaging (TDA) |
| url | https://ieeexplore.ieee.org/document/9089294/ |
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