Demultiplexing Method of Variable Capacity Optical OFDM Signal Using Time Lens-Based Optical Fourier Transform

Koichi TAKIGUCHI  Takaaki NAKAGAWA  Takaaki MIWA  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.2   pp.112-117
Publication Date: 2018/02/01
Online ISSN: 1745-1353
Type of Manuscript: PAPER
Category: Optoelectronics
optical signal processing,  optical Fourier transform,  optical OFDM,  demultiplexer,  optical communication,  

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We propose and demonstrate a method that can demultiplex an optical OFDM signal with various capacity based on time lens-based optical Fourier transform. The proposed tunable optical OFDM signal demultiplexer is composed of a phase modulator and a tunable chromatic dispersion emulator. The spectrum of the variable capacity OFDM signal is transformed into Nyquist time-division multiplexing pulses with the optical Fourier transform, and the OFDM sub-carrier channels are dumultiplexed in the time-domain. We also propose a simple method for approximating and generating quadratic waveform to drive the phase modulator. After explaining the operating principle of the method and the design of some parameters in detail, we show successful demultiplexing of 4×8 and 4×10 Gbit/s optical OFDM signals with our proposed method as the preliminary investigation results.