JW3106 Series three wavelength light source not only easily identifies the cutting of all kind of the fiber patchcords and ribbon or bunched pigtails, but also provides the laser output for the measurement of the 1310/1550nm SM fiber or 850/1300nm MM fiber. Working with JW3203 series optical power meter, they form a system of the fiber optic loss measurement. It is a excellent choice to meet the operation of the wide attenuation range, stable output power and stable wavelength.