70km external cavity DWDM sources based on O-band self seeded RSOAs for transmissions at 2.5Gbit/s

A DWDM self-seeded source achieves transmission in the O-band up to 90km SSMF at 2.5Gbps. Moreover, a "face-to-face" self-seeded architecture permits to realize transmissions at 2.5Gbps with extra-long optical cavities reaching 70km of SSMF.