title: 448 Gbit/s, 32 Gbaud 128 QAM coherent transmission over 150 km with a potential spectral efficiency of 10.7 bit/s/Hz.
abstract: We realized a single-carrier, polarization-multiplexed 32 Gbaud 128 QAM coherent transmission. Digital frequency-domain equalization enabled us to achieve waveform distortion compensation of a wideband data signal with high frequency resolution. Thus, we successfully increased the QAM multiplicity to 128 at 32 Gbaud, and transmitted 448 Gbit/s data over 150 km with a potential spectral efficiency of 10.7 bit/s/Hz. This is the highest multiplicity and spectral efficiency yet achieved in a coherent QAM transmission at a baud rate of as high as 32 Gbaud.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Kasai
authors.forename: Yixin
authors.initials: Y
authors.lastname: Wang
authors.forename: David Odeke
authors.initials: DO
authors.lastname: Otuya
authors.forename: Masato
authors.initials: M
authors.lastname: Yoshida
authors.forename: Masataka
authors.initials: M
authors.lastname: Nakazawa