Implementation of power-efficient ONU for elastic-bandwidth IFDMA-PON uplink by employing polar-coordinate transformed PSK mapping [invited]

• Published in: Journal of optical communications and networking Vol. 5; no. 10; pp. A249 - A256
• Main Authors: Ishii, Kenji, Onohara, Kiyoshi, Akiyama, Yuji, Noda, Masaki, Nogami, Masamichi, Koguchi, Kazuumi, Yoshida, Yuki, Maruta, Akihiro, Mizuochi, Takashi, Kitayama, Ken-ichi
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01.10.2013; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coherent communication; Fiber optics and optical communications; Field programmable gate arrays; Frequency division multiplexing; Multiple access; Optical network units; Passive optical networks; Phase shift keying; Power demand; Uplink
• ISSN: 1943-0620; 1943-0639
• DOI: 10.1364/JOCN.5.00A249

We present an implementation of a power-efficient optical network unit (ONU) for elastic-bandwidth coherent interleaved frequency-domain multiple access passive optical network (IFDMA-PON) uplink. The ONU for a 12 Gbps quadrature phase-shift keying (QPSK) signal is implemented on a 40 nm copper CMOS process field programmable gate array. By employing polar-coordinate transformed mapping of the PSK signal, the circuit size of the ONU is drastically reduced. The power consumption of the real-time IFDMA modulation circuit is 0.82 W, which achieves 90% reductionin power consumption compared to conventional OFDMA-PON systems. Finally, elastic-bandwidth QPSK signal generations and error-free detection are experimentally demonstrated: 6 Gbps at ONUs 1 and 2, 3 Gbps at ONU1, and 9 Gbps at ONU2.