What is the main characteristic of single-mode fiber?

What is the main characteristic of single-mode fiber?

• A. It transmits light over long distances using multiple modes of light
• B. It has a larger core diameter allowing for high bandwidth
• C. It has a smaller core diameter allowing only one mode of light to propagate
• D. It is primarily used for local area networks

Answer: (C)

The main characteristic of single-mode fiber is its smaller core diameter that allows only one mode of light to propagate. This narrow core diameter, typically around 8-10 micrometers, minimizes modal dispersion, which is the spreading of light pulses over distance. By allowing only one mode to travel, single-mode fiber retains its signal integrity and supports transmission over much longer distances compared to multi-mode fiber. This makes it ideal for long-haul telecommunications and high-speed data applications. In contrast, the other options do not accurately describe single-mode fiber. For example, the option discussing transmission over long distances using multiple modes refers to multi-mode fiber, which has a larger core and can transmit multiple modes of light, resulting in higher modal dispersion. The mention of local area networks points to multi-mode fiber as well, which is commonly used for these applications due to its lower cost and ease of use in shorter distances. Ultimately, the fundamental attribute that distinguishes single-mode fiber is its ability to facilitate the propagation of only one mode of light, enhancing performance and enabling longer spans for data transmission.

The main characteristic of single-mode fiber is its smaller core diameter that allows only one mode of light to propagate. This narrow core diameter, typically around 8-10 micrometers, minimizes modal dispersion, which is the spreading of light pulses over distance. By allowing only one mode to travel, single-mode fiber retains its signal integrity and supports transmission over much longer distances compared to multi-mode fiber. This makes it ideal for long-haul telecommunications and high-speed data applications.

In contrast, the other options do not accurately describe single-mode fiber. For example, the option discussing transmission over long distances using multiple modes refers to multi-mode fiber, which has a larger core and can transmit multiple modes of light, resulting in higher modal dispersion. The mention of local area networks points to multi-mode fiber as well, which is commonly used for these applications due to its lower cost and ease of use in shorter distances. Ultimately, the fundamental attribute that distinguishes single-mode fiber is its ability to facilitate the propagation of only one mode of light, enhancing performance and enabling longer spans for data transmission.