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An optical fiber grating coupler (FGC) is a grating-written fused fiber coupler in which a refractive index modulated grating is written in its tapered region. The FGC can be applied to an all-optical switch using a cross phase modulation in the grating. However, the silica based FGC switch requires a control light with high power for the switching, therefore it is difficult to apply the FGC switch...
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