Spectrum-efficient optical transmission with bitrates of 400 Gb/s and beyond can be
achieved using flexible modulation with advanced DSPs. The technology options include …

Higher-order modulation formats and spectral super-channels are key to maximizing
spectral efficiency (SE) in next-generation optical transport networks, thereby …

Routing in dynamic future optical networks will depend on the underlying technology and
more specifically on whether standard grid or flexi-grid technology will be used. In particular …

Wavelength Division Multiplexing (WDM) networks of the future are likely to use Flexgrid,
providing operators with additional flexibility when assigning spectrum compared to …

Optical WDM backbone networks based on fixed spectrum grid have limitations such as low
spectrum utilization and rigidity in provisioning for heterogeneous rates. Flexible-grid …

Wavelength Switched Optical Networks (WSON) were designed with the premise that all
channels in a network have the same spectrum needs, based on the ITU-T DWDM grid …

We introduce architectures to enable flexible-client functionality in software-defined transport
networks for the first time, and propose an effective algorithm to provision time-varying traffic …

Elastic optical path networks have been proposed as a promising approach to flexibly use
the optical spectrum (hence the name flexi-grid) thus overcoming the rigidness of traditional …

In order for transport networks to cost-effectively provide higher capacity, it is expected that
channel bit-rates beyond 100 Gb/s will be accomplished by resorting to a flexible WDM grid …

BACKGROUND The present invention relates optical communications, and, more
particularly, to spectrum aware rate selection for optical channels in flexible wavelength …