Sha** modulation formats in multi-dimensional (MD) space is an effective approach to
harvest spectral efficiency gains in both the additive white Gaussian noise (AWGN) channel …

This paper reviews the performance of optimized modulation formats in two, four, and eight
dimensions. We present performance (lower bounds) for higher dimensions by exploiting …

In this paper, we examine the performance of several modulation formats in more than four
dimensions for coherent optical communications systems. We compare two high …

We demonstrate a polarization-managed 8-dimensional modulation format that is time
domain coded to reduce inter-channel nonlinearity. Simulation results show a 2.3 dB …

For excellent cost and performance, modern high capacity transport systems use digital
coherent processing to overcome many physical barriers. Coherent methods are explained …

Coherent dual-polarization (DP) optical transmission systems encode information on the
four available degrees of freedom of an optical field: the two polarization states, each with …

We discuss optical transmission using homogeneous, single-mode, multicore fibers. We first
describe the key fiber properties that can affect transmission, such as intercore crosstalk and …

We investigate high dimensional modulation formats for multi-core fibers (MCFs) and spatial
superchannels. We show that the low skew variations between MCF cores maybe exploited …

Multidimensional geometric sha** has been shown to outperform uniform quadrature
amplitude modulation (QAM) in optical communication systems but the complexity of symbol …

In this paper, we numerically and experimentally investigate the impairments related to laser
phase noise in coherent digital subcarrier multiplexing (SCM) systems. Based on the …