We believe the dispersion compensation ratio is 100%, according to the datasheet in the 1st link below. Dispersion: -420 ps/nm, we guess this value is around 1570nm, based on similar-model test data at last pdf link below.

DCF has much higher Raman gain coefficient than regular SMF. This DCM is designed to use as Raman amplifier, showing from manufacture test data of similar-model DCM at last pdf link below. It can be also used as regular DCM.

Without fiber connectors.  There is 900um buffer fiber pigtail in green jacket on each end of fiber spool, and there is sleeve-protected fusion splice between 900um buffer fiber pigtail and internal dispersion-compensating fiber (250um-coating bare fiber in red color) on each end of fiber spool. The internal dispersion-compensating fiber roll (with 250um-coating in red) is covered with soft glue. Based on our experience, this glue layer can be easily removed by hand, in case you need use shorter fiber length. According to manufacture test data of similar-model, the green fiber pigtail is SMF, so you can easily fusion-splice this DCM with regular SMF or add fiber connector by standard fusion-splice.