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We introduce an extremely thin 50/125 perfluorinated graded-index plastic optical fiber (POF) and its application in a 4×10 Gb/s optical link including our optical sub-assembly (OSA). We outline the main characteristics of the POF before the introduction of the fibers to our already established OSA is explained. Particularly low attenuation with error-free transmission down to a bending radius of 1 mm is presented in comparison to a quartz optical fiber. Furthermore eye diagrams of all four channels after 5 m over POF at 10 Gb/s are presented. Bit error rate for all channels is less than 10-12 and remains constant when another channel is being driven simultaneously.