What is a design option for a broadband cable network to maximize the use of its optical fiber resources?

Leasing spare fibers serves as a strategic design option for maximizing the usage of optical fiber resources in a broadband cable network. This approach allows a network operator to expand capacity and accommodate growing demand without the immediate need for substantial infrastructure investment. Leasing spare fiber enables companies to meet peak demand or unforeseen growth while maintaining flexibility, as they do not have to commit to the fixed costs associated with massive expansions or upgrades.

While the other strategies might seem beneficial, they don't inherently provide the same level of efficient resource use. Utilizing single-mode fibers exclusively narrows options but may not necessarily utilize all available resources effectively. Installing additional amplifiers focuses on signal strength rather than increasing available capacity, which may lead to inefficiencies. Replacing all existing cables may involve significant capital expenditure and operational disruption, thus not being as resource-efficient as leasing spare fibers. This makes leasing an optimal choice for enhancing broadband capabilities in a cost-effective manner.