The invention relates to an optical fiber having a plurality of light-guiding core regions (1) which extend, mutually spaced, along the longitudinal extension of the optical fiber and which are all located, viewed in the cross-section of the optical fiber, inside a. The invention relates to an optical fiber having a plurality of light-guiding core regions (1) which extend, mutually spaced, along the longitudinal extension of the optical fiber and which are all located, viewed in the cross-section of the optical fiber, inside a. In this work, a novel polarization-maintaining hollow-core fiber structure featuring a semi-circular nested dual-ring geometry is proposed. To simultaneously optimize two inherently conflicting performance metrics, namely, birefringence and confinement loss, a multi objective genetic algorithm is. 📦 For purchasing, use the RP Photonics Buyer's Guide for polarization-maintaining fibers. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. What are. SAXONBURG, PA, October 28, 2025 (GLOBE NEWSWIRE) – Coherent Corp. (NYSE: COHR), a global leader in photonics, today announces the launch of its next generation polarization-maintaining optical fiber, engineered to deliver superior performance and reliability for the high-performance fiber laser. Here, we report the first experimental realization of a low-loss, polarization filtering antiresonant hollow-core fiber (AR-HCF). Conventional AR-HCFs inherently support degenerate orthogonal polarization modes, making them vulnerable to polarization drift under environmental perturbations.