This work presents a novel lensed plastic optical fiber (POF), efficiently coupled with a light source. A convexo-concave plastic lens (CCPL) was bound to a flat-end plastic optical fiber using laser transmission welding (LTW) to form a conve.xo-concave-shaped fiber endface (CCSFE). The novel lensed plastic optical fiber has a longer working di.stance anda higher coupling efficiency than conventional lensed plastic optical fibers. 850 nm fiber is often used in high-power 2.5 Gbis transmission rate. Experimental POF is perfluorinated POF, 62.5-500 ßm diameter, 850^1300 ßm wavelength, 10 dB/km power ¡OSS rate, 2.5 GbIs transmission rate. Because of the small diameter of POF, it is difficult to couple between the light source and POF. Therefore, it is important to develop a lensed fiber structure to increase the coupling efficiency. E.xperiments indicate that the coupling efficiency between a laser diode at a wavelength of 850 nm and a graded-index POF is as high as 85% with a long working distance of 250 ßm. The measured tolerance, in relation lo the lateral and vertical displacements and tilt, are satisfactory for practical active alignment.

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