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The article presents a unique design for a hollow-core anti-resonant fiber, which utilizes a single-layer semi-circular Anti resonant unit positioned around the central core. The simulation analysis reveals this design can achieve transmission over a wide bandwidth of 500-1300nm, while exhibiting relatively low losses at wavelengths near 700-800nm and 900- 1100nm. The anti-resonant fiber with this structure boasts strong wavelength limitation capability for light transmission, along with high transmission stability in a low-loss mode. Based on the simulation analysis results of the changes in loss characteristics, the hollow core anti-resonant fiber we designed has a mode field diameter of approximately 30 microns, and the wall thickness of the core anti-resonant structure is approximately 0.4 microns. By optimizing the process, such as through preform shaping and wire tension adjustment, a 5km long span with high uniformity was achieved for the hollow core anti-resonant fiber, and corresponding tests were carried out. The test results indicate that the total loss value of the hollow anti-resonant fiber, prepared under optimized process conditions, can be managed at a reduced level, with an attenuation of less than 0.1dB/m at 1064nm. Due to the outstanding pure single mode characteristics of optical fibers, there is no obvious mode coupling between the optical signal and the quartz cladding, neither the inner quartz wall in the transmission channel. In devices utilizing fiber enhanced Raman spectroscopy (FERS), this particular fiber can achieve highly sensitive sensing and precise analysis of Raman spectroscopy. Due to its low attenuation characteristics, the system achieves excellent sensing performance in fiber-enhanced Raman spectroscopy systems, enabling precise detection of a 450ppm CO2 concentration. Based on simulation analysis and testing, this article confirms the benefits of this novel fiber in fiber-enhanced Raman spectroscopy systems, presenting a fresh option for researching fiber Raman gas measurement technology.
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