The Delaire USA qualification test links are designed to act as worst-case links for bandwidth/dispersion and attenuation. These links are intended to be used in the qualification of transceivers designed to meet the IEEE 802.3ae specifications for 10GB multimode links at 850nm. The links provided are not simply designed for the length requirements but are tailored to simulate the actual bandwidth defined by the length bandwidth (OFL or EMB) product called out in the standard.
802.3ae Qualification Test Link Datasheet

The Delaire USA qualification test links are designed to act as test links for bandwidth and a particular fiber type. These links are intended to be used in the qualification of transceivers designed to meet the LRM specifications† for 10GB multimode links at 850nm and 1300nm. The links provided are not simply designed for the length requirements but are tailored to simulate the actual bandwidth defined by the length bandwidth (OFL) product called out in the standard. The actual fibers used are industry standards and thus represent a sampling of all of the modal structure possibilities.
LRM-802.3aq Qualification Test Link Datasheet

The Delaire USA fiber test links are built to meet the customer’s Loss, Dispersion and Distance requirements. These links are used in the testing of optical transmission systems at 1310nm, C-band, L-band as well as 850nm. Both Single Mode and Multimode versions are available. The links provided are not simply designed for the length requirements but are tailored to provide the desired dispersion characteristics. Since these are built from hand selected industry standard fiber instead of simulated with dispersion elements, all of the effects including, loss, dispersion as well as fiber nonlinearities are present.
Fiber Optic Dispersion Test Link Datasheet