ADC/DAC resolution tolerance improvement by implementing probabilistic shaping distributions in PAM and QAM modulation schemes

Xiao Han; Yang Yue; Zhen Qu; Ryan Holmes; Ivan B. Djordjevic

doi:10.1117/12.2583215

5 March 2021 ADC/DAC resolution tolerance improvement by implementing probabilistic shaping distributions in PAM and QAM modulation schemes

Xiao Han, Yang Yue, Zhen Qu, Ryan Holmes, Ivan B. Djordjevic

Author Affiliations +

Proceedings Volume 11712, Metro and Data Center Optical Networks and Short-Reach Links IV; 117120N (2021) https://doi.org/10.1117/12.2583215
Event: SPIE OPTO, 2021, Online Only

Abstract

In this paper, we simulated the ADC/DAC resolution tolerance improvement by implementing probabilistic shaping (PS) distributions in PAM and QAM modulation schemes for 400G and 800G transmissions. We compared PS- and uniformdistributed PM-16QAM, PM-32QAM, and PM-64QAM performance in 800G coherent transmission in FR links. The PS distribution scheme is based on Maxwell-Boltzmann distribution, and 0.1378 FEC overhead is chosen. We demonstrate that for any of these modulation schemes the post-BER (post-FEC bit-error rate) performance is more sensitive to ADC resolution. Moreover, the application of PS distribution can offer us 0.5-dB improvement in received optical power (ROP) for LDPC-coded PM-16QAM and 0.7-dB improvement for PM-32QAM, while PM-64QAM can get 0.6-dB improvement in ROP. For PAM transmission, we simulated a 4-channel CWDM 400G transmission system with wavelengths 1271 nm, 1291 nm, 1311 nm, and 1331 nm for 4-PAM modulation scheme. The PS distribution scheme we used in PAM is exponential distribution, and the FEC overhead is also 0.1378. We demonstrated that the pre-SER (pre-FEC symbol-error rate) performance is also more sensitive to the ADC resolution compared to DAC resolution. Therefore, the PS LPDCcoded modulation represents a great candidate to improve the system performance and reduce the cost.

Conference Presentation

Citation Download Citation

Xiao Han, Yang Yue, Zhen Qu, Ryan Holmes, and Ivan B. Djordjevic "ADC/DAC resolution tolerance improvement by implementing probabilistic shaping distributions in PAM and QAM modulation schemes", Proc. SPIE 11712, Metro and Data Center Optical Networks and Short-Reach Links IV, 117120N (5 March 2021); https://doi.org/10.1117/12.2583215

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