This tutorial paper reviews advanced modulation techniques that have been proposed in the
literature for the implementation of flexible (or reconfigurable) transceivers, which are …

Point-to-multipoint (P2MP) optical coherent transceivers, which take advantage of digital
subcarrier multiplexing, can greatly simplify design, planning and operations in next …

Fiber optics channels provide flat channel response per wavelength in general, owing to the
ultrawide available bandwidth of optical fibers and optical amplifiers. However, the recent …

The past decade witnessed the stirring development of advanced optical modulations and
digital signal processing, which have been pushing optical transmission systems towards …

Since the frequency offset estimation (FOE) must be implemented before the subcarrier de-
multiplexing and chromatic dispersion compensation (CDC) for digital subcarrier …

Since the deployment of the first commercial polarization-multiplexed (PM) QPSK 100G
systems, the evolution of coherent optical communications in the last decade has been …

In flexible optical networks, lightpaths are routed from source to destination thanks to
reconfigurable optical add-drop multiplexers (ROADMs) placed in every node connected by …

We propose two low-complexity digital signal processing (DSP) techniques to improve the
system performance of digital subcarrier multiplexing (DSCM) optical transmission system …

For the digital subcarriermultiplexing (DSM) transmission, it is compulsory to realize the
frequency offset estimation (FOE) and compensation (FOC) before the subcarrier de …

Multicarrier modulation can use entropy loading to adapt a frequency-dependent channel.
We compare single-and multi-carrier (SC/MC) signaling in a 100-GBaud coherent system …