고출력 광섬유 레이저를 위한 광섬유 칩 기반 All-fiber 7 x 1 펌프 광 결합기 제작
Fabrication of All-fiber 7 × 1 Pump Combiner Based on a Fiber Chip for High Power Fiber Lasers
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초록
본 논문에서는 고출력 광섬유 레이저를 위한 광섬유 칩 기반 all-fiber 7 × 1 펌프 광 결합기의 제작에 대하여 보고한다. 광섬유칩은 코어, 클래딩 직경이 각각 20, 400 μm인 광섬유를 길이 방향으로 식각하여 제작하였다. 7개의 입력 광섬유 부분은 105,125 μm의 코어, 클래딩 직경을 가진 7개의 입력 광섬유를 원통형 다발로 제작하여 광섬유 칩의 375 μm부분에 융착하였고, 1개의 출력 광섬유는 코어, 클래딩 직경이 각각 25, 250 μm 광섬유를 광섬유 칩의 250 μm부분에 융착하여 최종적으로 7 × 1 펌프광 결합기를 제작하였다. 제작된 광섬유 칩 기반 7 × 1 펌프 광 결합기의 포트별 평균 광 전달 효율은 약 90.2%로 나타났다.
Abstract
In this paper, we report measured results for an all-fiber 7 × 1 pump combiner based on an optical fiber chip for high-powerfiber lasers. An optical-fiber chip was fabricated by etching a fiber, having core and cladding diameters of 20 and 400 μm, inthe longitudinal direction. To both ends of the etched chip, we spliced input and output fibers. First, we tied together seven opticalfibers, having core and cladding diameters of 105 and 125 μm respectively, in a cylindrical bundle and spliced them to the375-μm end of the optical-fiber chip. Then, we attached an output DCF with core and cladding diameters of 25 and 250 μmto the 250-μm end of the optical-fiber chip. Finally, the fabricated 7 × 1 pump combiner showed an average optical couplingefficiency of about 90.2% per port. This chip-based pump combiner may replace conventional pump combiners by massiveproduction of fiber chips.
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