Abstract
Recently, digital signal processing (DSP) methods have been extensively
studied and various DSP-based schemes have been proposed for next-generation
passive optical network (PON). In this paper, we combine the time-division-multiplexing
(TDM) architecture with advanced DSP methods to achieve high spectrum-efficiency
colorless transmission. Orthogonal frequency division multiplexing (OFDM),
as the original form of various DSP methods with frequency-domain equalization
(FDE), is chosen for both upstream and downstream transmissions. In the TDM-PON
based on OFDM (TDM-OFDM-PON) architecture, OFDM symbols are transmitted in
different time slots instead of on-off-key (OOK) bits in conventional TDM-PON.
This architecture can be extended for single-carrier with FDE easily. Due
to the same TDMA scheme, it can achieve maximum compatibility with current
TDM-PON. A DSP-based evolution scheme from conventional TDM-PON to TDM-OFDM-PON
is proposed and experimentally demonstrated by upgrading the optical line
terminal (OLT) to support both OOK and OFDM signals, which can maintain the
current optical distribution network (ODN) and minimize the impact for the
existing service and equipment.
© 2013 IEEE
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