# Modal bandwidth

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{{Short description|Maximum signaling rate for a given distance}}{{Unreferenced|date=October 2025}}

{{Use American English|date = March 2019}}

'''Modal bandwidth''', in the discipline of [telecommunications](/source/telecommunications), refers to the maximal signaling rate for a given distance or – the other way around – the maximal distance for a given signaling rate. The signaling rate can typically be measured in [MHz](/source/MHz), and the modal bandwidth is the product of bandwidth and distance (typically expressed in MHz·km). For a cable with a certain modal bandwidth, the maximal frequency can be doubled when the distance is halved, and conversely.

The modal bandwidth is derived from the [modal dispersion](/source/modal_dispersion) of the fiber and the spectral linewidth of the laser:

: <math>f_\text{s} \cdot L = \frac{1}{D_\text{chrom.} \cdot \Delta\lambda}.</math>

Modal bandwidth is sometimes referred to as EMBc.

{{Telecomm-stub}}

{{DEFAULTSORT:Modal Bandwidth}}
Category:Telecommunication theory

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Adapted from the Wikipedia article [Modal bandwidth](https://en.wikipedia.org/wiki/Modal_bandwidth) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Modal_bandwidth?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.