We developed a simple silica-based BDFA with 80nm 6-dB gain-bandwidth flexibly centred within 1305-1325nm, and parameters comparable to EDFAs. The amplifier can extend 400GBASE-LR8 transmission (8×26.6 Gbaud/s PAM-4 channels) beyond 50 km of G.652 fiber.

© 2019 The Author(s)

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