title: Terabit bandwidth-adaptive transmission using low-complexity format-transparent digital signal processing.
abstract: In this paper, we propose a low-complexity format-transparent digital signal processing (DSP) scheme for next generation flexible and energy-efficient transceiver. It employs QPSK symbols as the training and pilot symbols for the initialization and tracking stage of the receiver-side DSP, respectively, for various modulation formats. The performance is numerically and experimentally evaluated in a dual polarization (DP) 11 Gbaud 64QAM system. Employing the proposed DSP scheme, we conduct a system-level study of Tb/s bandwidth-adaptive superchannel transmissions with flexible modulation formats including QPSK, 8QAM and 16QAM. The spectrum bandwidth allocation is realized in the digital domain instead of turning on/off sub-channels, which improves the performance of higher order QAM. Various transmission distances ranging from 240 km to 6240 km are demonstrated with a colorless detection for hardware complexity reduction.
authors.forename: Qunbi
authors.initials: Q
authors.lastname: Zhuge
authors.forename: Mohamed
authors.initials: M
authors.lastname: Morsy-Osman
authors.forename: Mathieu
authors.initials: M
authors.lastname: Chagnon
authors.forename: Xian
authors.initials: X
authors.lastname: Xu
authors.forename: Meng
authors.initials: M
authors.lastname: Qiu
authors.forename: David V
authors.initials: DV
authors.lastname: Plant