title: Reconfigurable optical inter-channel interference mitigation for spectrally overlapped QPSK signals using nonlinear wave mixing in cascaded PPLN waveguides.
abstract: A reconfigurable all-optical inter-channel interference (ICI) mitigation method is proposed for an overlapped channel system that avoids the need for multi-channel detection and channel spacing estimation. The system exhibits a 0.5-dB implementation penalty compared to a single-channel baseline system. Experiments using a dual-carrier QPSK overlapped system with both 20G-baud and 25G-baud under different channel spacing conditions evaluate the performance of the method. Improved signal constellation and receiver sensitivity demonstrate the effectiveness of this approach. This results in over 4-dB OSNR of benefit when the system Q-factor reaches a forward error correction (FEC) threshold of 8.5 dB under less-than-baudrate channel spacing conditions.
authors.forename: Yinwen
authors.initials: Y
authors.lastname: Cao
authors.forename: Morteza
authors.initials: M
authors.lastname: Ziyadi
authors.forename: Amirhossein
authors.initials: A
authors.lastname: Mohajerin-Ariaei
authors.forename: Ahmed
authors.initials: A
authors.lastname: Almaiman
authors.forename: Peicheng
authors.initials: P
authors.lastname: Liao
authors.forename: Changjing
authors.initials: C
authors.lastname: Bao
authors.forename: Fatemeh
authors.initials: F
authors.lastname: Alishahi
authors.forename: Ahmad
authors.initials: A
authors.lastname: Falahpour
authors.forename: Bishara
authors.initials: B
authors.lastname: Shamee
authors.forename: Jeng-Yuan
authors.initials: JY
authors.lastname: Yang
authors.forename: Youichi
authors.initials: Y
authors.lastname: Akasaka
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Sekiya
authors.forename: Moshe
authors.initials: M
authors.lastname: Tur
authors.forename: Carsten
authors.initials: C
authors.lastname: Langrock
authors.forename: Martin
authors.initials: M
authors.lastname: Fejer
authors.forename: Joseph
authors.initials: J
authors.lastname: Touch
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner