Buffer couplers are devices used in telecommunications to connect different types of optical fibers or to manage the transmission of light signals. They help to minimize signal loss and maintain the integrity of data as it travels through various mediums. By providing a smooth transition between fibers, buffer couplers ensure efficient communication in networks. These couplers are essential in systems like fiber optic networks and data centers, where high-speed data transfer is crucial. They can also be found in telecommunication equipment and laser applications, where precise alignment and minimal signal degradation are necessary for optimal performance.