We demonstrate Chirally-Coupled-Core (CCC) fiber with 35-µm diameter and 0.07 NA core which is effectively single-mode. This is a new type of fibers whose modal properties are defined both by their longitudinal and transverse structure.
Novel index-guiding-core single-mode fibers with V >> 2.405 are demonstrated at 1550-nm and 1064-nm wavelengths. This fiber design is based on chirally-coupled core concept, which enables a new type of index-guiding and photonic-crystal fiber structures.OCIS codes: (060.2280) Fiber design and fabrication; (060.2320) Fiber optics amplifiers and oscillators
Introduction.Recent advance of fiber laser technology into multi-kW average 1 and multi-MW peak 2, power generation in diffractionlimited output beams have been critically based on adopting so called Large-Mode Area (LMA) fibers, in which multimode fibers with large cores (typically 20-μm to 30-μm diameter, with 65-μm to 80-m state of the art demonstrations 2 ) are used with careful mode-management 3, 4 for achieving single-mode operation. This offsets many traditional technological advantages of conventional single-mode low-power fiber laser technology, hindering development of all-monolithic large-core fiber systems.
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