... and development , manufacturing . It is widely used in PON systems communication, optical measurementand fiber sensing, etc.FeaturesChinese and ... menuHigh stability source output ,1310/1490/1550nm wavelength for PON systemOutput power adjust, four grade output, step - ... manual on/offTwo AA batteries, easy to changeSpecification PON Stable Laser SourceOutput wavelength(nm)1310nm,1490nm,1550nmEmitter ...