A Band-Divided Receiver Prototype for Wideband Optical Signals

Munehiro MATSUI  Riichi KUDO  Yasushi TAKATORI  Tadao NAKAGAWA  Koichi ISHIHARA  Masato MIZOGUCHI  Takayuki KOBAYASHI  Yutaka MIYAMOTO  

IEICE TRANSACTIONS on Communications   Vol.E94-B    No.7    pp.1801-1808
Publication Date: 2011/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1801
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
coherent receiver,  analog to digital converter,  OFDM,  real-time,  heterodyne receiver,  

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Over 100 Gbit/s/ch high-speed optical transmission is required to achieve the high capacity networks that can meet future demands. The coherent receiver, which is expected to yield high frequency utilization, is a promising means of achieving such high-speed transmission. However, it requires a high-speed Analog to Digital Converter (ADC) because the received signal bandwidth would be over several tens or hundreds of GHz. To solve this problem, we propose a band-divided receiver structure for wideband optical signals. In the receiver, received wideband signals are divided into a number of narrow band signals without any guard band. We develop a band-divided receiver prototype and evaluate it in an experiment. In addition, we develop a real-time OFDM demodulator on an FPGA board that implements 1.5 GS/s ADCs. We demonstrate that the band-divided receiver prototype with its real-time OFDM demodulator and 1.5 GS/s ADC can demodulate single polarization 12 Gbit/s OFDM signals in real-time.