1.7 Gb/s-419 km transmission experiment using a shelf-mounted FSK coherent system and packaged fiber amplifier modules

Experiments to assess the commercial viability of long-span FSK coherent systems with fiber amplifiers were performed. Transmission spans of 253, 365, and 419 km with integrated shelf-mounted modules have been demonstrated in repeaterless systems and in single-fiber and two-fiber amplifier repeatered systems, respectively.<
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