The FMT80-DCM from FS.COM Inc is a Dispersion Compensation Module with Compensated Fiber Length(Distance) 80 km, Dispersion Compensation Level -1360±3% ps/nm, Insertion Loss 5.8 dB, Wavelength Range 1525 to 1565 nm, Polarization Dependent Loss 0.1 dB. More details for FMT80-DCM can be seen below.