DCM for one span truewave fiber compensation over L-band, about -480ps/nm at 1585nm. Approximated sample tested result in our lab: IL=3.67dB at 1.55um with 2 jumpers. The maker is OFS(Lucent). See test data of similar DCM(Type: DCMTWRS:600, store part no.:FSC-DCM-030) in the htm link below as reference only. Type: DCMTWRS480. This DCM was removed from DCMB480 card of L-band ultra long-haul DWDM systems, so it should be 100% dispersion slope compensation for truewave fiber over L-band. It is same as store part no.: FSC-DCM-030B, except the internal fiber length and dispersion value. See more info and photos of store part no.: FSC-DCM-030B for reference. 

Fiber length is tested as 4.482km by OTDR approximately at our lab, assuming effective refractive index is same as LEAF fiber (1.4690 at 1.55um).