The Agilent 81640A tunable laser source covers both C- and L - Band. It is specially designed for testing critical DWDM passive components.This Agilent "A" Tunable Laser Source has been replaced by 81640B but can be upgraded.The 81640A works in both DWDM bands (C- and L-Band). It has continuous sweep through full wavelength range, low source spontaneous emission output for high dynamic range, high power optical output for optical amplifier test, a built-in real-time wavelength meter and mode-hop free tuning over full wavelength rangeSpecifications Wavelength Range: 1510nm to 1640nm Max. Output Power: 4dBm Wavelength Accuracy (abs.): +/- 0.015nm Wavelength repeatability (typ.): +/- 0.5pmOptions:071 - PMF, straight fiber interface