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Optical Performance of Fiber Collimators Fabricated by Direct Splicing of Angled Fiber to Lens

Direct splicing is expected to markedly reduce the size and manufacturing cost of fiber collimators. We have successfully suppressed the return and the coupling losses of the fiber collimators fabricated by the direct splicing of an angled fiber to a lens. A return loss of 66.5 dB and a coupling loss of 0.13 dB on average were obtained. The tensile strength of the spliced portion was measured to be larger than 2.0 N. Moreover, the environmental tests of the fiber collimators showed sufficient reliability. Fiber collimators directly spliced with angled fibers can be used in various optical devices for telecommunication.