This paper reviews the status of research into elastic optical networks and flexgrid,
illustrating the benefits of new flexible technologies to allow higher network capacities and …

Dual polarization quadrature phase-shifting keying (DP-QPSK) wavelength division
multiplexing (WDM) systems are currently acting as the backbone of long-haul optical …

In this paper, we present an original work on sub-wavelength optical switching performed
over a coherent multi-band orthogonal frequency-division multiplexing (MB-OFDM) super …

With the introduction of Nyquist pulse shaping, it is possible to transmit a channel in a
spectral window close to its baud rate. To increase the overall network spectral efficiency …

This chapter discusses the changes in technology option or design to support the elastic
concept in an optical network. Next, it introduces in detail some practical aspects of the …

To improve the spectral efficiency and increase network capacity, wavelength signals must
be multiplexed densely, ie, ultra-dense wavelength-division-multiplexing (WDM) networks …

Advanced modulation formats like dual-polarization quadrature phase-shift keying (DP-
QPSK) along with the digital coherent receiver are enabling optical networks to provide high …

In flexigrid elastic optical networks, filtering cascade effects strongly affect the overall
transmission performance. To avoid these detrimental impairments, each lightpath is …

A cost-effective and fast network capacity upgrade with what we believe to be novel
bandwidth-variable virtual direct links (BV-VDLs) is proposed. BV-VDLs are designed to …

As DWDM transmission offers enhanced wavelength/spectrum parallelism, the capacity of
optical networks has been substantially increased. Due to the theoretical capacity limit of C …