“…Fabry–Perot (F–P) fiber interferometers can achieve accurate measurements of physical parameters such as temperature [1,2], pressure [3], strain [4], and other physical parameters due to their small size, light weight, anti-electromagnetic interference, and high sensitivity. They are widely used in the health monitoring of large steel structures [5], deep oil well pressure measurements [6], and biomedical arterial blood pressure measurements [7], playing a major role in different fields such as industry, medicine, military, construction, aviation, and navigation [8]. However, most of the current F–P interferometers use a single-mode fiber (SMF) for signal arm transmission.…”