Wavelength Selective Switching (WSS)
Wavelength selective switching (WSS) is the controlled manipulation of light based on one of its fundamental properties: wavelength (“color” when the visible light spectrum is used).
WSS is one of the key enabling technologies for reconfigurable optical add/drop multiplexers (ROADM) and reconfigurable optical networks.
A typical WSS use is the selective routing of the individual wavelength division multiplexing (WDM) channels entering via an input fiber port to any of the output fiber ports according to the software configuration that is remotely controlled by the service providers.
Wavelength division multiplexing (WDM) is a technology used in fiber-optical communications. WDM technology multiplexes different wavelengths into a single optical fiber and demultiplexes the optical carrier signals from single optical fiber to different wavelengths. Based on WDM technology, not only is there a reduction of the number of optical fibers, but also an expansion of network capacity.