Hollow Core Fiber is defined by its central, air-filled channel, which contrasts with the solid glass core of conventional optical fiber. In HCF, the light is instead guided through the. Hollow-core optical fibers (HCFs) have unique properties like low latency, negligible optical nonlinearity, wide low-loss spectrum, up to 2100 nm, the ability to carry high power, and potentially lower loss then solid-core single-mode fibers (SMFs). This reduces latency to around 3. 5 microseconds per kilometer, offering a 30 to 50 percent speed increase. Hollow-core fibers are widely regarded as a key technology for the future of data transmission.