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

Next generation optical networks will require high levels of flexibility both at the data and
control planes, being able to fit rate, bandwidth, and optical reach requirements of different …

Efforts towards commercializing higher-speed optical transmission have demonstrated the
need for advanced modulation formats, several of which require similar transceiver …

In this paper, we discuss building blocks that enable the exploitation of optical capacities
beyond 100 Gb/s. Optical networks will benefit from more flexibility and agility in their …

As 100-Gb/s digital coherent systems enter commercial deployment, an effort is underway to
uncover the technologies that will enable the next-generation optical fiber communication …

In this paper, we analyze hybrid modulation formats as an effective technology for the
implementation of flexible transponders that are capable of trading off the delivered data rate …

The deployment of high-order modulation formats in optical fiber transmission systems is
presently seen as a promising way of increasing spectral efficiency and of making better use …

The evolution of optical technologies is driving the introduction of multirate optical networks
exploiting advanced transmission techniques and efficient switching devices. In the short …

In this invited contribution, we discuss technology options for bandwidth-variable
transceivers which are key components for the realization of flexible software-defined optical …

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 …