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A directional fiber coupler with exertion loss 0.03-dB has been successfully fabricated using fusion technique with typical coupling ratio 1%–90%. The coupling region of two twisted single mode fiber is heated by injecting Hydrogen gas at 2.5 Bar. During fusion process, both two sides of fiber are pulled by stages that are automatically motorized in range of 800–4800μm, and stopped when the preset...
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