Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC
Data center interconnections are cost-sensitive. We propose and demonstrate a cost-effective C-band intensity modulation direct detection (IM/DD) transmitter for extended range (ER) inter-datacenter interconnects utilizing only a 2-bit digital-to-analog converter (DAC). Tomlinson-Harashim...
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IEEE
2024-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/10530341/ |
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| author | Zhuo Chen Zipeng Liang Junyu Wu Weiqi Lu Xinyu Chang Xiaoxiao Dai Qi Yang Chen Liu Mengfan Cheng Lei Deng Deming Liu William Shieh |
| author_facet | Zhuo Chen Zipeng Liang Junyu Wu Weiqi Lu Xinyu Chang Xiaoxiao Dai Qi Yang Chen Liu Mengfan Cheng Lei Deng Deming Liu William Shieh |
| author_sort | Zhuo Chen |
| collection | DOAJ |
| description | Data center interconnections are cost-sensitive. We propose and demonstrate a cost-effective C-band intensity modulation direct detection (IM/DD) transmitter for extended range (ER) inter-datacenter interconnects utilizing only a 2-bit digital-to-analog converter (DAC). Tomlinson-Harashima precoding (THP) is used in transmitter DSP to compensate for dispersion-induced impairments. Due to the uniform distribution of signal levels after THP encoding, a high-resolution DAC is required to generate electrical signals. The hardware cost of the transmitter can be significantly reduced by compressing the physical number of bits (PNOB) of the DAC to 2 bits. We quantize the signal to 4 levels and utilize up-sampling and noise shaping to greatly reduce the in-band quantization noise. The in-band signal to noise ratio (SNR) can be increased to 23 dB. We experimentally demonstrate a cost-effective 40-Gbaud probabilistic shaping PAM-4 C-band IM/DD transmission over 50-km utilizing only a 2-bit DAC in the transmitter without any optical dispersion compensation. The performance of the proposed scheme is proximate to the common case of using an 8-bit DAC. It has a BER gap of about 2 × 10<sup>−3</sup> only when the received optical power (ROP) is higher than −6 dBm. |
| format | Article |
| id | doaj-art-0add18beeb8141d2a353a6e751d4b998 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-0add18beeb8141d2a353a6e751d4b9982025-08-20T03:15:51ZengIEEEIEEE Photonics Journal1943-06552024-01-011631710.1109/JPHOT.2024.340079110530341Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DACZhuo Chen0https://orcid.org/0000-0001-6828-8213Zipeng Liang1Junyu Wu2Weiqi Lu3https://orcid.org/0009-0001-9630-7685Xinyu Chang4Xiaoxiao Dai5https://orcid.org/0000-0003-3408-7493Qi Yang6https://orcid.org/0000-0001-9017-6971Chen Liu7https://orcid.org/0000-0003-2000-8133Mengfan Cheng8https://orcid.org/0000-0002-8221-0612Lei Deng9https://orcid.org/0000-0003-2647-4610Deming Liu10https://orcid.org/0000-0001-5591-2929William Shieh11https://orcid.org/0000-0003-1777-5403School 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 Engineering, Westlake University, Hangzhou, 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 Engineering, Westlake University, Hangzhou, ChinaData center interconnections are cost-sensitive. We propose and demonstrate a cost-effective C-band intensity modulation direct detection (IM/DD) transmitter for extended range (ER) inter-datacenter interconnects utilizing only a 2-bit digital-to-analog converter (DAC). Tomlinson-Harashima precoding (THP) is used in transmitter DSP to compensate for dispersion-induced impairments. Due to the uniform distribution of signal levels after THP encoding, a high-resolution DAC is required to generate electrical signals. The hardware cost of the transmitter can be significantly reduced by compressing the physical number of bits (PNOB) of the DAC to 2 bits. We quantize the signal to 4 levels and utilize up-sampling and noise shaping to greatly reduce the in-band quantization noise. The in-band signal to noise ratio (SNR) can be increased to 23 dB. We experimentally demonstrate a cost-effective 40-Gbaud probabilistic shaping PAM-4 C-band IM/DD transmission over 50-km utilizing only a 2-bit DAC in the transmitter without any optical dispersion compensation. The performance of the proposed scheme is proximate to the common case of using an 8-bit DAC. It has a BER gap of about 2 × 10<sup>−3</sup> only when the received optical power (ROP) is higher than −6 dBm.https://ieeexplore.ieee.org/document/10530341/Data center interconnectiondigital-to-analog convertertomlinson-harashima precodingintensity modulation direct detection |
| spellingShingle | Zhuo Chen Zipeng Liang Junyu Wu Weiqi Lu Xinyu Chang Xiaoxiao Dai Qi Yang Chen Liu Mengfan Cheng Lei Deng Deming Liu William Shieh Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC IEEE Photonics Journal Data center interconnection digital-to-analog converter tomlinson-harashima precoding intensity modulation direct detection |
| title | Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC |
| title_full | Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC |
| title_fullStr | Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC |
| title_full_unstemmed | Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC |
| title_short | Cost-Effective 40-Gbaud THP PS-PAM-4 C-Band IM/DD Transmission for 50-km Inter-DCI Utilizing 2-bit DAC |
| title_sort | cost effective 40 gbaud thp ps pam 4 c band im x002f dd transmission for 50 km inter dci utilizing 2 bit dac |
| topic | Data center interconnection digital-to-analog converter tomlinson-harashima precoding intensity modulation direct detection |
| url | https://ieeexplore.ieee.org/document/10530341/ |
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