3 × ONU No-Guard-Band Coherent OFDMA-PON Uplink Demonstration Using a Real-Time Transmitter With a Free-Running 100-kHz-Linewidth ECL

• Published in: Journal of lightwave technology Vol. 33; no. 8; pp. 1666 - 1674
• Main Authors: Yoshida, Yuki, Maruta, Akihiro, Ishii, Kenji, Onohara, Kiyoshi, Akiyama, Yuji, Noda, Masaki, Nogami, Masamichi, Koguchi, Kazuumi, Mizuochi, Takashi, Kitayama, Ken-Ichi
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.04.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coherence; Computer simulation; Delays; Digital signal processing; Links; Multiple access; OFDM; Optical coherent communication; Optical network units; Optical transmitters; Orthogonal frequency division multiple access (OFDMA); Passive optical network (PON); Prototypes; Real time; Real-time systems; Transmitters; Uplink; Uplinking; Optical coherent communication; orthogonal frequency division multiple access (OFDMA); passive optical network (PON)
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2015.2390221

In this study, we demonstrate coherent OFDMA-PON uplink transmission experimentally using three optical network units including a 3-Gbaud real-time transmitter prototype. Cooperative digital signal processing at the ONUs and an optical line terminal enable no-guard-band subcarrier-based multiple access with free-running up to 100-kHz-linewidth external cavity lasers over a 40-km fiber link. In addition, we demonstrate the OFDMA-PON uplink with multiformatted and unequally-allocated subcarriers over up to 65-km link to verify the bandwidth flexibility of the proposed uplink. We then extend the experimental results to cases with >3 ONUs via numerical simulation.