Marciano Santos, CaioCaioMarciano SantosMarciano, Pablo Rafael NevesPablo Rafael NevesMarcianoJosé Pontes, Maria JoséMaria JoséJosé PontesSegatto, Marcelo Eduardo VieiraMarcelo Eduardo VieiraSegattoLima Silva, Jair A.Jair A.Lima Silva2023-10-182023-10-182023https://publica.fraunhofer.de/handle/publica/45187710.1364/JOSAB.4825232-s2.0-85160210557The transmission of constant envelope orthogonal frequency division multiplexing (CE-OFDM) signals is experimentally demonstrated in this paper to increase the reach of metro-regional optical links. A recirculating fiber loop was implemented for this aim. A reach extension of 100 km of standard single-mode fiber was achieved with the CE-OFDM-based system, considering 16 quadrature amplitude modulation (16-QAM) as subcarrier mapping and links without optical dispersion compensation. Link lengths as long as 700 km, with spectral efficiency of 1.89 b/s/Hz, were accomplished with performances below the forward error correction limit.enjournal article