Coherent's select cut-off single-mode fiber products are intended for operation at various visible and near IR wavelengths. They are used in laser diode pigtailing, fused fiber couplers, RGB applications, endoscopes and various fiberoptic sensors. This product group consists of step-index single mode fibers with precisely controlled core diameters and numerical apertures. The fabrication platform can be readily adapted to manufacture fiber with custom waveguide parameters for unique applications.