We review the progress of BDFA development for O-band amplification. Currently, BDFAs can provide up to 35 dB small signal gain, less than 5.5 dB noise figure, and up to 29 dBm output power over 1270-1360 nm. We discuss amplifier design issues including pump wavelength and bandwidth allocation, as well as components performance and availability. Recent transmission experiments including LAN-WDM and CWDM modules reach extension over the spooled fiber and installed cables will be presented. Future milestones in BDF/BDFA development would also be suggested. Since with the implementation of BDFAs the transmission over O-band would no longer be power budget limited, we will briefly discuss the options of chromatic dispersion compensation over O-band.
We developed a family of silica-based BDFAs operating over telecom O-band (1260-1360 nm). We demonstrated that 80 meters long single pump single stage amplifier can provide up to 19 dB gain, 20 dBm output power with 5 dB noise figure and 20% power conversion efficiency over 80 nm bandwidth (6-dB). The amplifier gain peak can be flexibly centered over 1305-1325 nm by pump wavelength selection. We designed simple BDFA operating over IEEE standardized part of the O-band (1272-1310 nm) and demonstrated that it can extend 425 Gb/s 400GBASE-LR8 transmission (eight 26.6 Gbaud/s PAM-4 channels) beyond 50 km of G.652 fiber.
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