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Record-low loss of 0.149dB/km at 1550nm is realized by pure-silica-core fiber having optimally enlarged Aeff, which indicates record-high figure-of-merit for digital coherent system. Mass-productivity is verified with 7,000km long fabrication whose averaged loss of 0.154dB/km.
Precise measurement of far-field distribution is presented for fibers having enlarged Aeff. By employing newly-proposed method to align fiber end-face with ±10μm position accuracy, we demonstrate Aeff measurement with errors of 0.1%.
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