Measurements of loss and bandwidth in multimode fibers are known to be highly dependent on the modal condition of the light source used for the measurement. For example, OTDR and LS/PM loss measurements can differ significantly simply because an OTDR uses a laser source and not an LED. Now there is a way to dramatically improve agreement AND ensure you meet international standards at the same time - the ModCon. The ModCon is a passive device which ensures that the correct launch conditions are achieved independent of the light source used. This results in more accurate measurements, better agreement between different test sets, and compliance with the 85/85% launch conditions called for in various aerospace standards. Every ModCon is tested using an MPX Modal Explorer to ensure that its output meets the standard regardless of the modal distribution of the input.