The MPI-800 multipath interference meter has been launched by Exfo Electro-Optical Engineering Inc. for the deployment and provisioning of DWDM and time division multiplexing, ultralong, high-speed optical networks. The handheld instrument contains the multipath interference meter, a power meter and a light source for complete fiber and system component characterization. Measurement range is from –55 to –20 dB, with accuracy of ±0.7 dB. The DFB laser source delivers adjustable output power from –11.5 to 1 dBm. The device measures the multipath interference in Raman-amplified networks at each critical point to ensure quality transmission. It also is available with various ITU-specified sources in the C- and L-bands.