Optical link
From Wikipedia, the free encyclopedia
An optical link is a communications link that consists of a single end-to-end optical circuit. A cable of optical fiber, possibly concatenated into a dark fiber link, is the simplest form of an optical link.
Other forms of optical link can include single-"colour" links over a wavelength division multiplex infrastructure, and/or links that use optical amplifiers to compensate for attenuation over long distances.
Other forms of optical links include free-space optical communication links.
Also in the railways optical is used in two forms depending upon the whether the feeding station is main or not. Thus for main stations it is sain to be long hall and for all remaining stations it is to be short hall. Template:An engineering student
