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The maximum coupling efficiencies for different types of fibers are plotted. The x-axis represents the fiber output optical power on a logarithmic scale. Fiber coupling efficiency is observed to be power-independent. All the small-core fibers have 40-50%, whereas most of the large-core fibers have 80-90%. Note that DCPCF16um has similar coupling efficiency to small-core ones due to its small fiber core NA, even though it has relatively large core.
