In this paper, we proposed a novel scheme using self-homodyne balanced detection in the optical line terminal (OLT) to reduce OBI noise which is generated in the uplink transmission of OFDMA-PON system. When multiple OFDMA sub-channels over the same nominal wavelength are received at the same time in the proposed architecture, OBI noises can be removed using balanced detection. Using discrete multitone modulation (DMT) to generate real valued OFDM signals, the proposed technique is verified through experimental demonstration.
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Sang-Min Jung, Yong-Yuk Won, Sang-Kook Han, "Optical beat interference noise reduction in OFDMA optical access link using self-homodyne balanced detection," Proc. SPIE 9008, Optical Metro Networks and Short-Haul Systems VI, 90080M (1 February 2014);