A Level Physics Practice Exam

Why is it important to prevent 'crossover' of signals in optical fiber communications?

1. To maintain the integrity of data transmission

2. To optimize the core's thermal conductivity

3. To increase the working voltage

4. To reduce the weight of the fiber optics

The correct answer is: To maintain the integrity of data transmission

Preventing 'crossover' of signals in optical fiber communications is crucial to maintaining the integrity of data transmission. Crossover refers to the unwanted mixing or interaction of light signals traveling through the same optical fiber. This issue can lead to signal degradation, crosstalk, and a decline in performance, ultimately resulting in errors in data interpretation at the receiving end. In optical fibers, light signals are transmitted through a core surrounded by a cladding that reflects the light back into the core. If signals from different channels cross over, they can interfere with each other, leading to a loss of information and possible miscommunication. As data rates increase and more channels are accommodated within the same fiber, maintaining clear separation between individual signals becomes even more critical. Hence, ensuring that signals do not crossover is vital for effective communication and the reliability of transmitted data. Other options are not directly relevant to the core issue here. Thermal conductivity, working voltage, and fiber weight do not fundamentally relate to the fidelity of signal transmission within optical fibers. Consequently, while those factors may have their own importance, they are not the primary concern when discussing the necessity of preventing signal crossover.