A low complexity quasi-coherent 50-Gb/s/λ PAM4 LR-PON under the 7% hard decision forward FEC threshold is demonstrated. Electrical dispersion compensation (EDC) is applied to compensate the fiber chromatic dispersion. The power budgets after 80-km and 100-km SSMF transmission without pre-amplifier are 36 dB and 34 dB, respectively.
DD-LMS and CMMA equalizer are compared in 60GBaud PDM-PAM4 heterodyne detection PON. With lower computational complexity, DD-LMS scheme gets similar performance compared with CMMA scheme. The power budgets after 40-km SSMF transmission of DD-LMS and CMMA are 35-dB and 35.5-dB, respectively.
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