title: 112 Gb/s transmission over 80 km SSMF using PDM-PAM4 and coherent detection without optical amplifier.
abstract: Polarization-division-multiplexed (PDM) four-level pulse amplitude modulation (PAM4) with coherent detection is a promising low cost solution for 80 km inter-datacenter transmissions at 100 Gb/s and beyond. In this paper, three modified adaptive equalization algorithms for the PDM-PAM4 optical coherent systems, i.e. signal-phase aid least-mean-square (SP-LMS) algorithm, training multi-modulus algorithm (TMMA) and cascaded four-modulus algorithm (CMMA-4), are proposed and compared. Based on the proposed algorithms, 112 Gb/s PDM-PAM4 transmission over 80 km standard single mode fiber (SSMF) in C-band for a bit error rate (BER) below 3.8e-3 is successfully demonstrated without optical amplifier, chromatic dispersion (CD) pre-compensation and extra carrier recovery operations.
authors.forename: Xian
authors.initials: X
authors.lastname: Zhou
authors.forename: Kangping
authors.initials: K
authors.lastname: Zhong
authors.forename: Jiahao
authors.initials: J
authors.lastname: Huo
authors.forename: Lei
authors.initials: L
authors.lastname: Gao
authors.forename: Yiguang
authors.initials: Y
authors.lastname: Wang
authors.forename: Liang
authors.initials: L
authors.lastname: Wang
authors.forename: Yanfu
authors.initials: Y
authors.lastname: Yang
authors.forename: Jinhui
authors.initials: J
authors.lastname: Yuan
authors.forename: Keping
authors.initials: K
authors.lastname: Long
authors.forename: Li
authors.initials: L
authors.lastname: Zeng
authors.forename: Alan Pak Tao
authors.initials: AP
authors.lastname: Lau
authors.forename: Chao
authors.initials: C
authors.lastname: Lu