CPC G02B 26/10 (2013.01) [G02B 6/02 (2013.01)] | 20 Claims |
1. An optical fiber, wherein a fiber core end face of the optical fiber is designed as being recessed inwardly to form a negative focal power, such that an equivalent light-emitting surface of the fiber core end face is focused reversely inside a fiber core, wherein the equivalent light-emitting surface has a projection area smaller than that of the fiber core end face.
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