Article

Block-wise phase switching for double-sideband direct detected optical OFDM signals

Optics Express (Impact Factor: 3.49). 06/2013; 21(11):13436-41. DOI: 10.1364/OE.21.013436
Source: PubMed

ABSTRACT

We propose phase switching for either main-carrier or subcarriers of two consecutive signal blocks to achieve fading-free double-sideband direct-detection (DD). The proposed approach has twice of the electrical spectral efficiency (SE) of offset OFDM, and the same electrical SE as single-side band (SSB) OFDM. With this scheme, 40-Gb/s DD-OOFDM is successfully received over 80-km SSMF with single polarization and single detector.

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    • "rthogonal frequency division multiplexing (OFDM) is now a well-established transmission solution for optical communication systems [1]. Although optical OFDM with coherent detection has an improved performance, OFDM transmission in optical communication systems with direct detection (DD) is a major topic of investigation, either for application in long-haul and metropolitan networks [1] [2] [3] [4] or access networks [5] [6] [7]. "
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    ABSTRACT: An analytical method based on the moment generating function (MGF) is proposed for assessing the performance of direct-detection (DD) orthogonal frequency division multiplexing (OFDM) optical receivers with radio-frequency (RF) demodulation. The MGF-based method is a generalization of the method previously reported in the literature for DD baseband OFDM optical receivers. The proposed method relies on the analytical derivation of equivalent filters that describe the combined effect of electrical filtering + RF demodulation + FFT operation + the equalizer of the OFDM receiver for the real and imaginary parts of the signal at the equalizer output. The method takes into account imperfections of the RF demodulator, namely, power and phase imbalance between the RF demodulator arms and different electrical filtering on its arms. Numerical results show excellent agreement between the bit error probability estimates provided by the proposed method and estimates obtained from Monte Carlo simulation, in the absence and presence of receiver imperfections.
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    ABSTRACT: A novel SSBI cancellation scheme based on time diversity reception is proposed. Experiment shows that the proposed scheme improves ~3.6dB sensitivity compared with baseband optical OFDM scheme in a 5-Gbps SSB-DD-OOFDM system over 100-km SMF.
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    ABSTRACT: In this paper, we propose and demonstrate phase switching for either main carrier or subcarriers of two consecutive signal blocks to achieve fading-free double-sideband direct-detection. The proposed approach has twice of the electrical spectral efficiency (SE) of offset OFDM, and the same electrical SE as single-side band OFDM. We perform numerical simulation and verify the system robustness against polarization mode dispersion and laser phase noise. Our experimental results show that 40-Gb/s direct-detection OOFDM can be successfully delivered over 80-km SSMF with single polarization and single detector.
    No preview · Article · Feb 2014 · Journal of Lightwave Technology
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