A core in fiber optics is a single strand of fiber. It forms one half-duplex channel, where one transmitter can send data to one receiver. In order to form a full-duplex channel, two cores or strands are required. Many fiber optic cables contain many cores organized in many bundles.
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MSAN is Multi-Service Access Node
It wasn't a one man effort, inventing fiber optics. Works were inspired by John Tyndall who first discovered light can travel an irregular path through glass. Alexander Graham Bell later contributed. Heinrich Lamm in 1930 put the first fiber optic cable together stranding cable together and sending a signal across the wire. There were many other people who helped improve it over the year. Al Gore is not the father of Fiber Optic cables, in case you were wondering.
Attenuation in fiber means 'loss of optical power' suffered by the optical signal in fiber itself.
No. Transformers operate on the principle of conversion of electric current to and from magnetism. Optic fiber is not ferromagnetic, nor is it conductive.
The transmission characteristic of a fiber optic channel is highly non-linear. It makes it a very bad medium for analog signals. Luckily it doesn't interfere with digital transmissions.