This applicationis related to the field of optical fiber and in particular, to Hollow Core Fiber (HCF) for near single mode transmission of a signal in a preferred single polarization state in the hollow core of the fiber. These two fibers are named based on the stress rods used. Stress rods run parallel to the fiber's core and apply stress that creates birefringence in the fiber's core, allowing polarization-maintaining. In the rapidly evolving landscape of optical communication and sensing technologies, choosing the right fiber optic cable is a critical decision that directly impacts system performance, reliability, and cost-effectiveness. Among the most widely used options are single-mode fiber (SMF) and. Polarization Maintaining Single Mode Fiber by Application (Fiber Optic Gyroscopes (FOGs), Fiber Optic Sensors and Lasers, Telecom Components, Others), by Types (Panda Fiber, Bow Tie Fiber, Elliptical Fiber, Others), by North America (United States, Canada, Mexico), by South America (Brazil. The U. market for single mode polarization maintaining (PM) fiber is characterized by a concentrated landscape dominated by a handful of established global players, alongside emerging companies leveraging innovative manufacturing techniques.