Which of the following statements is/are true? (a) There is...

Which of the following statements is/are true? (a) There is a minimum dispersion in single-mode step index fibre than other fibres (b) The bandwidth of information transmission is minimum for single-mode step-index fibre than other fibres (c) The bandwidth of information transmission is maximum for single-mode step index fibre than other fibres (d) The single-mode step index fibres are less expensive and casily to construct than other fibres

Which of the following statements is/are true?
(a) There is a minimum dispersion in single-mode step index fibre than other fibres
(b) The bandwidth of information transmission is minimum for single-mode step-index fibre than other fibres
(c) The bandwidth of information transmission is maximum for single-mode step index fibre than other fibres
(d) The single-mode step index fibres are less expensive and casily to construct than other fibres

Key Concepts

Single-Mode Optical Fibers

Single-mode optical fibers are designed to allow the propagation of only one spatial mode of light, eliminating modal dispersion—which is the spreading of the optical pulse caused by different paths taken by different modes in multimode fibers. This results in a cleaner transmission over long distances and is key to high-speed data communications.

Dispersion in Optical Fibers

Dispersion in optical fibers refers to the phenomenon where different components of a light pulse travel at different speeds, causing the pulse to broaden over distance. In single-mode fibers, dispersion is minimal since there is only one mode of propagation, thereby maintaining the integrity of transmitted signals over long distances.

Bandwidth of Information Transmission

The bandwidth of information transmission in optical fibers is directly related to how well the fiber can confine and preserve pulses of light. Reduced dispersion in single-mode fibers allows for higher effective bandwidth, meaning that they can support faster data rates compared to fibers with higher dispersion.

Fiber Manufacturing and Cost Considerations

The fabrication of optical fibers involves precision techniques, and while step-index single-mode fibers offer superior performance in terms of bandwidth and dispersion, they often require more exacting manufacturing processes. This can make them more costly compared to other fiber designs, such as multimode or graded-index fibers, although the performance benefits often justify the higher cost in many applications.

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