TIA Publishes Measurement Standard for Multimode Fiber

The Telecommunications Industry Association (TIA) published a new test procedure standard (TIA-455-220-A) for characterizing the modal structure of a graded index multimode fiber. Differential Mode Delay (DMD) is the transmission delay between different modes of energy propagation in a multimode fiber. DMD contributes to the total dispersion (spreading) of a transmitted pulse and therefore can affect the system throughput. TIA said its new test method is commonly used in production and research facilities and is not easily accomplished in the field.
http://www.tiaonline.org