Optical networks are supporting a wide range of communication services including
residential services, enterprise services, and mobile services. Figure 1 illustrates a typical …

We review probabilistic constellation shaping (PCS), which has been a key enabler for
several recent record-setting optical fiber communications experiments. PCS provides both …

This tutorial paper provides a foundation for integrating probabilistic shaping (PS) and
forward error correction (FEC). A layered PS-FEC architecture consisting of a PS encoder …

Ultra-wideband (UWB) wavelength division multiplexed (WDM) transmission using high-
order modulation formats is one of the key techniques to expand the transmission capacity …

Fiber nonlinear interference (NLI) modeling and monitoring are the key building blocks to
support elastic optical networks. In the past, they were normally developed and investigated …

We introduce and compare typical shaping schemes suitable for optical communications.
The geometrically shaped-quadrature amplitude modulation (GS-QAM) formats are …

In this paper, a new four-dimensional 64-ary polarization ring switching (4D-64PRS)
modulation format with a spectral efficiency of 6 bit/4D-sym is introduced. The format is …

We present a low-complexity fully pilot-based digital signal processing (DSP) chain
designed for high spectral efficiency optical transmission systems. We study the …

In order to transition multi-core fiber (MCF) technologies from their research state to volume
production, the key design specifications have to be broadly agreed upon, first and foremost …

We show that system performance degradation due to in-line optical filtering by wavelength
routing nodes in WDM networks can be correctly modelled using digital communications …