Because of the small core
size and the more powerful laser transmitters
used, singlemode can carry signals much further
than multimode. Fiber cables placed under the
oceans or across the country are singlemode,
not multimode. Because a laser can turn on and
off faster than an LED, singlemode fiber also
has more bandwidth capability. Singlemode is
the fiber type of choice for maximum bandwidth,
even if the distance is within the limitations
of multimode.
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