Green, elastic coherent IFDMA-PON for next-generation access network

In this talk, our recent R&D activities a green, elastic next-generation (NG) access network based upon coherent interleaved-frequency division multiple access (IFDMA), a special class of OFDMA will be presented. Conventional OFDMA systems require power-consuming IFFT in the transmitter. It will be shown that “Green” can be realized in the generation of IFDMA signals by replacing the IFFT circuit with a simplified subcarrier mapping circuit. “Elastic” bandwidth provisioning will be demonstrated by the uplink experiment of dynamic allocation on-demand of 20 Gbps-QPSK and 30 Gbps-8 PSK signals to two ONUs. In addition, the carrier synchronization technique of the uplink between multiple ONUs by using DSP-based low-complexity carrier frequency offset (CFO) pre-compensation will be discussed.

[1]  Junqiang Hu,et al.  A Novel OFDMA-PON Architecture With Source-Free ONUs for Next-Generation Optical Access Networks , 2009, IEEE Photonics Technology Letters.

[2]  J. Nakagawa,et al.  Experimental demonstration of 2xONU 30Gbps digitally-supported-coherent IFDMA-PON uplink , 2012, OFC/NFOEC.

[3]  Yuki Yoshida,et al.  Low-power consumption DSP circuit design for IFDMA-based PON systems , 2011, 16th Opto-Electronics and Communications Conference.

[4]  Ting Wang,et al.  Computationally-efficient DSP-based MIMO equalization for OSNR gains in 40Gb/s OFDMA-PON , 2011, 2011 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference.