Traditional 50GHz and 100GHz optical transport networks based on ITU grid standards has done well for past decades. However, as the industry transitions to 400G to 1 terabyte and beyond there is a need to adopt Flex Spectrum technologies.
With the adoption of greater speed interfaces and the use of Superchannels being able to support multiple subcarriers Flex Spectrum is the clear contender for optical carrier systems now and far into the future. Flex Spectrum systems allow for greater channel sizes but can additionally allow for those channels to be closely aligned to the signal being transported to increase efficiency.
Finally, no conversation regarding Flex Spectrum capabilities is complete without talking about colorless, directionless and contentionless (CDC) technologies. These capabilities will allow Flex Spectrum systems to have a greater deal of resiliency, flexibility and efficiency at the transport layer.