VIAVI offers a full range of compact OSAs tailored for spectral measurements in CWDM syst​ems in the access network as well as DWDM systems in the backbone and in for Next Generation 40G/ or 100G high-speed networksbackbone. The range also features an OSA version for ROADM-based systems or 40G networks with tight channel spacing, providing true OSNR measurements based on VIAVI’s unique in-band OSNR method.