A Comparative Study of Tapering Methods and Transfer Characteristics in Fabry-Perot Interferometric Applications

This study undertakes a comparative analysis in the field of fiber-optic probe fabrication, particularly emphasizing tapering techniques and their relevance in biomedicine, chemistry, and electronics. The necessity for advanced fiber-optic probes in these fields is rapidly growing, necessitating innovations in fabrication methods. Existing methods often fall short in efficiency and performance. The research aims to address these limitations by introducing and analyzing a novel fabrication approach. The proposed method uniquely combines the fusion of a transport optical fiber with matching fibers, forming a micro-lens with an average radius of approximately 15 µm. This technique features an enlarged core size and employs a welding apparatus specifically designed for optical fibers. Experimental validation reveals that this new method significantly improves transfer characteristics and reduces end-face reflection levels by 8 to 11 dB in comparison to the reflection levels of cleaved single-mode optical fibers at a 90degree angle, particularly within the 1530 – 1580 nm wavelength range. The study confirms that this novel approach enhances fiber-optic probe performance in Fabry-Perot interferometry, proving beneficial for applications that require minimal invasive measurements and high localization.