0.9mm SC / APC WDM Fiber Optic T1550nm R1310 & 1490nm Steel Tube Package Filter WDM module extensively used in optical amplifiers, WDM networks. The device combines or separates light at different wavelengths (1310nm/1490nm/1550nm) in a wide wavelength range. It can expand the capacity of a single fiber to achieve bidirectional communication, so that widely used in optical network upgrade and expansion, or introduce new comprehensive business etc. It works on 1310nm/1490nm,