The BTI systems line card includes a LLMicro DCM. BTI systems line cards are for C-band. The front panel of line card shows SMF25. OFS uses “SMF” to represent standard single-mode fiber (see 1st two pdf links below), so this DCM is for standard SMF rather than Truewave, Teralight, Leaf fiber, DSF. Standard SMF has typical dispersion 17 ps/nm/km, so this -425 ps/nm DCM can compensate 25km Standard SMF in C-band. With expansion port, it is just a LC-LC SMF jumper inside enclosure.

LLMicro is low loss version of Micro DSCM. See MicroDK DSCM info at 1st two pdf links below.

The spool drum dimension is 23x146x50mm (fiber roll is 50mm diameter), as shown at 5th photo below, same as MicroDK drum dimension 23x146x50mm.

We measured the fiber length by OTDR, about 2.664km, assuming effective refractive index is 1.4711.

If you really need reduce shipping cost, we can ship only DCM.

Following info is from 1st htm link below.
Low loss micro dispersion compensating modules (LLMicro DSCM) for compensation of standard single mode fiber, as well as reconfigurable dispersion compensating modules (R-DSCM) and dispersion compensating Raman amplified dispersion compensating modules (DCRA).

The LLMicro DSCM allows for a 3-4 fold decrease in size as well as the integration of the DSCM onto a linecard that can be built directly into the transmission system. This enables savings in space requirement as well as added flexibility in the design of the transmission system.

“Today’s DWDM systems have increased requirements for space and other physical restrictions, all of which are important economical factors; therefore, the compact nature of our LL Micro DSCM’s are of increasing importance to our system house customers,” explained Finn Birkedahl, Sales and Marketing Manager for the Specialty Photonics Division. “The significant space savings offers increased flexibility and room for future upgrades.”

The R-DSCM enables remote reconfiguration of the level of dispersion compensation rerouting the optical path inside the DSCM. This allows for remote optimization of the transmission system in case of changes to the network.

The DCRA utilizes the excellent gain characteristics of the dispersion compensating fiber resulting in a high Raman gain. This gain may be utilized for extending the performance of the EDF amplifier typically used in transmission systems, either in terms of the transmission span from e.g. 80 km to 120 km, or for expansion of the bandwidth of the amplifier.

These solutions are, as always, engineered with the system integrator in order to help assure the best possible performance of the final system.