Abstract
This paper presents a downlink scheme that permits the coexistence, on a passive optical network
branch, of future DSP-based optical network units (ONUs) that can receive advanced modulation signals and legacy ONUs
that can receive only on–off keying (OOK) signals. In the proposed scheme, the two types of signals, advanced
modulation signals and OOK signals, are multiplexed by using a hierarchical star quadrature amplitude modulation (QAM)
format and transmitted simultaneously on a single carrier. The design criteria and the feasibility of the proposal are
discussed. The coexistence of 10G-class ONUs and DSP-based ONUs using hierarchical star 8-QAM format is numerically
analyzed and experimentally evaluated. The results confirm that a 10-Gbps OOK signal and 30-Gbps star 8-QAM signal can
be received with 30.5-dB loss budget by an APD and intradyne detector with DSP, respectively. The ability of the
proposed approach to expand the coverage area is also introduced.
© 2013 IEEE
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