This fiber cord is fixed with the center of the connector's core and the optical fiber's core aligned with higher accuracy than ordinary connector connections. It can be widely used for a variety of optical measurements such as insertion loss and return loss measurements. Moreover, we can offer an opticalfiber cord with a 8°APC master connector, which adopts TOTOKU's original low reflection technology, and an optical-fiber cord with a super master connector, a high-accuracy high-end model. Features Core eccentricity is 0.3µm or less in single mode and 0.4µm or less in multi mode. <Master connector> Oblique polishing of the convex sphere (8°APC) is conducted for the prevention of the reflection of light for optical amplifiers and measuring apparatuses. <8°APC master connector> Most appropriate for optical measurements, evaluations and inspections of optical fibers with connectors integrated in measuring apparatuses. <Supermaster connector> Specifications     Super master connector 8°APC master connector Connector used FC·SC·C-HFC SC Type of optical fiber SM(9.5/125) Shape of end surface AdPC 8°APC Core eccentricity(µm or less) 0.1 0.2(Flat) Insertion loss(dB or more) 0.1 0.2 Return loss(dB or more) 45 65 Curvature eccentricity(µm or less) 30 Please contact us for other optical fibers. Specifications     Master connector Connector used FC SC C-HFC Type of optical fiber SM (9.5/125) GI (50/125) SM (9.5/125) GI (50/125) SM (9.5/125) GI (50/125) Shape of end surface Flat SPC · AdPC Flat SPC SPC · AdPC SPC SPC · AdPC SPC Core eccentricity(µm or less) 0.3 0.4 0.3 0.4 0.3 0.4 Return loss(dB or more) 0.5 0.2 0.5 0.2 Return loss(dB or more) - 45 - 35 45 35 45 35 Curvature eccentricity(µm or less) - 30 - 30 Please contact us for other optical fibers.