BaySpec's CWDM optical spectrum analyzer (OSA) is an embedded, integrated monitor that delivers precise measurements and powerful processing capabilities to coarse wavelength division multiplexing (CWDM) applications compliant with the ITU-T G. An innovative, low-cost analyzer for installation, maintenance and repair of any CWDM network This CWDM channel checker is an innovative, low-cost analyzer for installing, maintaining and repairing CWDM networks. CWDM combines up to 18 wavelengths into a. VIAVI covers a broad range of OSA needs with many compact solutions. Coarse Wave Division. COSA-4055 CWDM Optical Spectrum Analyzer Module for T-BERD/MTS-2000, -4000 V2,-5800 Platforms The COSA-4055 module offers the functionality and speed of an OSA in a handheld form factor at a fraction of the price of a traditional OSA. It is an ideal test tool for metro/access links and CWDM systems.