1 February 2014 Optical beat interference noise reduction in OFDMA optical access link using self-homodyne balanced detection
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Abstract
A Novel technique for reducing the OBI noise in optical OFDMA-PON uplink is presented. OFDMA is a multipleaccess/ multiplexing scheme that can provide multiplexing operation of user data streams onto the downlink sub-channels and uplink multiple access by means of dividing OFDM subcarriers as sub-channels. The main issue of high-speed, single-wavelength upstream OFDMA-PON arises from optical beating interference noise. Because the sub-channels are allocated dynamically to multiple access users over same nominal wavelength, it generates the optical beating interference among upstream signals.

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, Sang-Min Jung, Yong-Yuk Won, Yong-Yuk Won, Sang-Kook Han, 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); doi: 10.1117/12.2038667; https://doi.org/10.1117/12.2038667
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