Bandwidth Distance Product

Of an optical fiber, under specified launching and cabling conditions, at a specified wavelength, a figure of merit equal to the product of the fiber’s length and the 3 dB bandwidth of the optical signal. The bandwidth•distance product is usually stated in megahertz • kilometer (MHz•km) or gigahertz•kilometer (GHz•km). It is a useful figure of merit for predicting the effective fiber bandwidth for other lengths, and for concatenated fibers.