An optical link is a telecommunications link that consists of a single end-to-end optical circuit.
A cable of optical fibers, possibly concatenated into a dark fiber link, is the simplest form of an optical link.
[1][2] Other forms of optical link can include single-"colour" links over a wavelength-division multiplexing infrastructure, and/or links that use optical amplifiers to compensate for attenuation over long distances.
In the rail transport sector, optical links are used in two forms depending on whether the feeding station is a main station or not.
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