The SMF-DK from OFS Global is a Dispersion Compensation Module with Compensated Fiber Length(Distance) 5 to 150 km (Compensated fiber length), Dispersion Compensation Level 85 to 2550 ps/nm (Nominal Dispersion), Insertion Loss 0.30 to 11.20 dB (BOL RT, EOL over temperature), Wavelength Range 1528 to 1565 nm, Polarization Dependent Loss 0.1 dB. More details for SMF-DK can be seen below.