One of the indicators of a gas turbine engine’s energy efficiency is the service life of its individual components, particularly those without redundant units. The turbine fire tube is one of the primary components in this category. One of the most common solutions for monitoring the temperature distribution of the hot wall is distributed fiber-optic temperature sensors. However, existing fiber-optic temperature sensors are characterized by limited accuracy, high equipment costs, and sensitivity to external factors. Therefore, it is important to identify ways to improve the performance of temperature sensors for special operating conditions. The scientific and technical problem, which arose from practical needs, is addressed by proposing that fiber-optic temperature sensors for special operating conditions be manufactured using rutile optical fiber coupled with synthetic sapphire fiber. The proposed sensor differs in that alternative glass materials are used in its manufacture, and the procedure for processing measurement results is simplified.