Modal Bandwidth, in the discipline of
telecommunications, refers to the signalling rate per distance unit. The signalling rate can typically be measured in
MHz, and the modal bandwidth is expressed as MHz-km.The Modal bandwidth of a
multimode fiber is determined from the optical output power
frequency spectrum. The frequency at which the
amplitude drops three
decibels (dB) relative to the zero frequency component of the fiber is defined as the −3 dB bandwidth (or modal bandwidth) of the fiber.
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