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200 Gb/s PAM4 modulator design without DAC for inter Data-Centre Communication

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Abstract

This paper demonstrates a four-level pulse amplitude modulated (PAM4) signal without any digital to analog conversion by controlling the polarization of the continuous-wave laser signal applied to the two parallel placed Mach–Zehnder modulators. In this way, up to 200 Gbps, the PAM4 signal has been successfully generated and transmitted over an 80 km distance with a quality factor of 23.9 dB. The dispersion in optical fiber limits the data-transmission distance, which is reduced by controlling the chromatic dispersion using a dispersion compensated fiber. For long-distance transmission, polarization mode dispersion also comes into the picture due to its polarization dependency and degrades the signal’s quality, which is reduced by controlling the polarization rotator just before the DCF fiber. The proposed system is also suitable for inter data-center communication due to its 80 km distance data transmission with such a high bit rate and Q-factor.

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Acknowledgements

The authors would like to thank the Department of Science & Technology (International Bilateral Cooperation Division), New Delhi, for their funding to the Indo-Russian joint project vide sanction no: INT/RUS/RFBR/P-312 dated: 11.03.2019.

Funding

The work was funded by DST under Indo-Russian joint project vide sanction no: INT/RUS/RFBR/P-312 dated: 11.03.2019 and Sant Longowal Institute of Engineering and Technology under Grant in aid (GIA) fellowship scheme.

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Authors and Affiliations

  1. Department of ECE, Sant Longowal Institute of Engineering and Technology, Longowal, Sangrur, Punjab, India

    Vishal Sharma & Surinder Singh

  2. Department of Electronics and Communication, Punjabi University, Patiala, Punjab, India

    Lovkesh

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  1. Vishal Sharma
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  2. Surinder Singh
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  3. Lovkesh
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Correspondence to Surinder Singh.

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Sharma, V., Singh, S. & Lovkesh 200 Gb/s PAM4 modulator design without DAC for inter Data-Centre Communication. Opt Quant Electron 54, 677 (2022). https://doi.org/10.1007/s11082-022-04089-6

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