Mengli Liu, Mingyi Gao, Junchi Ke. Multi-distributed probabilistically shaped PAM-4 system for intra-data-center networks[J]. Chinese Optics Letters, 2021, 19(11): 110604
- Chinese Optics Letters
- Vol. 19, Issue 11, 110604 (2021)
Fig. 1. Block diagram of PS structure based on the proposed ELA method.
Fig. 2. Three-symbol ELA implementation process.
Fig. 3. Four probability distributed PAM-4 signals based on three-symbol ELA. (a) P1, (b) P2, (c) P3, and (d) P4.
Fig. 4. NGMI curves of uniform and PS PAM-4 signals over AWGN.
Fig. 5. Experimental setup of 25 Gbaud PAM-4 system. (a) Measured S21 parameter of the AWG; (b) measured end-to-end channel response with/without S21 compensation.
Fig. 6. Structure diagram of FFE.
Fig. 7. Measured BER curves for 25 Gbaud uniform and PS-PAM-4 signals. The inset shows the CCDF curves for different distributions.
Fig. 8. Eye diagrams of PS-PAM-4 signals with various probability distributions (−20 dBm): (a) P1, (b) P2, (c) P3, and (d) P4.
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Table 1. Energy of Each Combination for Three-Symbol ELA
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