Which of the following requires a laser transmitter?

The use of a laser transmitter is specifically associated with single-mode fiber optics. Single-mode fiber operates over long distances and uses a laser source to emit light. The laser generates a narrow spectral width, which allows the signal to travel through the core without much dispersion. This characteristic is essential for maintaining the integrity of the signal over extended lengths, enabling high bandwidth and long-distance communication.

In contrast, multi-mode fiber typically utilizes light-emitting diodes (LEDs) for transmission, which do not require the precision of laser light. Coaxial cables and twisted pair cables are electrical transmission media and do not involve optical signals, so they do not utilize laser transmitters. The technology behind single-mode fiber, specifically the need for a laser source to achieve optimal performance, clearly delineates its requirements from those of other types of cabling.