All-optical ultra-high-speed OFDM to Nyquist-WDM conversion based on complete optical fourier transformation

Guan, Pengyu, Røge, Kasper Meldgaard, Mulvad, Hans Christian Hansen, Galili, Michael, Hu, Hao, Lillieholm, Mads, Morioka, Toshio and Oxenløwe, Leif Katsuo (2016) All-optical ultra-high-speed OFDM to Nyquist-WDM conversion based on complete optical fourier transformation. Journal of Lightwave Technology, 34 (2), 626-632. (doi:10.1109/JLT.2015.2495188).

Abstract

We propose a novel all-optical ultra-high-speed orthogonal frequency-division multiplexing (OFDM) to Nyquist wavelength-division multiplexing (Nyquist-WDM) conversion scheme, achieved by exchanging the temporal and spectral profiles using a complete optical Fourier transformation (OFT). This scheme enables high-speed OFDM to Nyquist-WDM conversion without complex optical/electrical/optical conversion. The all-optical OFDM transmitter is based on the generation of OFDM symbols with a low duty cycle by rectangular temporal gating, which in combination with optical time-division multiplexing yields a higher symbol-rate OFDM signal. In the receiver, the converted Nyquist-WDM super-channel is WDM demultiplexed into individual Nyquist-WDM channels using a rectangular optical bandpass filter, followed by optical sampling at the intersymbol-interference free point. In the experimental demonstration, a single-polarization 8-subcarrier 640 Gb/s differential phase-shift keying OFDM super-channel with a spectral efficiency (SE) of 0.8 symbol/s/Hz is generated. The OFDM super-channel is then converted to eight 80-Gb/s Nyquist-WDM channels by complete OFT. The complete OFT is based on two quadratic phase-modulation stages using four-wave mixing, separated by a dispersive medium. In the receiver, a BER <10^-9 is obtained for all channels. The SE remains unchanged after conversion.

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Contributors

Author: Hans Christian Hansen Mulvad

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