An optical line termination (OLT), also called an optical line terminal, is a device which serves as the service provider endpoint of a. It provides two main functions: 1. to perform conversion between the electrical signals used by the service provider's equipment and the signals used by the passive optical network.
In astronomical telescopes, one sometimes uses optical fibers to transport light from the telescope to other devices for further analysis, e.g. for high-resolution spectral analysis. Here, fiber arrays allow one to.