This letter explores the Gram-Schmidt orthogonalization procedure (GSOP) for
compensation of quadrature imbalance in an optical 90 deg hybrid. We present computer …

We propose a novel method of compensation for imbalance between in-phase (I) and
quadrature (Q) channels in the front-end circuit of digital coherent optical receivers. Adaptive …

Digital coherent receivers have caused a revolution in the design of optical transmission
systems, due to the subsystems and algorithms embedded within such a receiver. After …

We discuss the use of a coherent digital receiver for the compensation of linear transmission
impairments and polarization demultiplexing in a transmission system compatible with a …

In-phase and quadrature skew inside a coherent receiver, caused by misalignments, can
severely limit performance. Future 400G systems employing higher order modulation …

Digital signal processing (DSP) combined with a phase and polarization diverse coherent
receiver is a promising technology for future optical networks. Not only can the DSP be used …

The performance of a feed-forward carrier frequency recovery algorithm for 16-quadrature
amplitude modulation (QAM) optical coherent systems is investigated using the quaternary …

Continuous real-time measurements are shown from a coherent 40 Gb/s transmission
system that uses Dual-Polarization Quadrature Phase Shift Keying (DP-QPSK) modulation …

Initial tap setup of constant modulus algorithm for polarization de-multiplexing in optical
coherent receivers Page 1 Initial Tap Setup of Constant Modulus Algorithm for Polarization …

In this paper we show that, in hybrid wavelength division multiplexed systems, the
performance of high datatrate QPSK channels impaired by cross-phase modulation (XPM) …