Abstract
This chapter describes the novel no-guard-interval (GI) coherent optical orthogonal frequency division multiplexing (OFDM) format for high-capacity optical transport network (OTN). Unlike the conventional OFDM configuration, the proposed scheme employs a very small number of OFDM subcarriers, so simple optical analog subcarrier multiplexing can be realized without digital signal processing (DSP) in the OFDM modulation. The scheme also introduces simple OFDM demultiplexing and a digital adaptive time domain or frequency domain equalizer for DSP demodulation in the receiver, without recourse to OFDM overhead (OH) bytes such as GI and training symbols, unlike the conventional OFDM receiver. There is no line rate increase in the OTN channel due to the introduction of these OFDM OH bytes (i.e., the line rate of 111 Gb/s includes 7% OTN overhead, and 103-Gb/s payload is available for bit transparent OTN mapping of 100-GbE signals). The No-GI-OFDM proposal is experimentally tested at the channel rate of 111 Gbit/s as the first step to realizing DWDM long-haul transport at over 10 Tbps.
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