title: Optical performance monitoring of QPSK data channels by use of neural networks trained with parameters derived from asynchronous constellation diagrams.
abstract: We demonstrate a technique for performance monitoring of quadrature phase-shift keying data channels by simultaneously identifying optical signal-to-noise ratio (OSNR), chromatic dispersion (CD), and polarization-mode dispersion (PMD) using neural networks trained with parameters derived from asynchronous constellation diagrams. A correlation coefficient of 0.987 is reported for a set of testing data from a 40 Gbps return-to-zero, quadrature phase-shift keying (RZ-QPSK) system. The root-mean-square (RMS) errors are 0.77 dB for OSNR, 18.71 ps/nm for CD, and 1.17 ps for DGD.
authors.affiliation: National Institute of Standards and Technology, Boulder, CO 80305, USA. jargon@boulder.nist.gov
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Jargon
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Wu
authors.forename: Hyeon Yeong
authors.initials: HY
authors.lastname: Choi
authors.forename: Yun C
authors.initials: YC
authors.lastname: Chung
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner