Article

428-Gb/s single-channel coherent optical OFDM transmission over 960-km SSMF with constellation expansion and LDPC coding

Department of Electrical and Electronic Engineering, Centre for Ultra-Broadband Information Networks and National ICT Australia, The University of Melbourne, VIC 3010, Australia.
Optics Express (Impact Factor: 3.49). 08/2010; 18(16):16883-9. DOI: 10.1364/OE.18.016883
Source: PubMed

ABSTRACT

High-order modulation formats and advanced error correcting codes (ECC) are two promising techniques for improving the performance of ultrahigh-speed optical transport networks. In this paper, we present record receiver sensitivity for 107 Gb/s CO-OFDM transmission via constellation expansion to 16-QAM and rate-1/2 LDPC coding. We also show the single-channel transmission of a 428-Gb/s CO-OFDM signal over 960-km standard-single-mode-fiber (SSMF) without Raman amplification. (C) 2010 Optical Society of America

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    • "Promising works are looking into a simplified structure enabling the same performance [12] [13]. Research activities related to LDPC algorithms for optical communication are mostly focused on simulation studies with a few experimental demonstrations [17] [18] [19] [20] [21] [22]. In [17] [18] [19] [20] a novel soft-decision all-electrical front end is demonstrated where the soft-decision bits are provided by a 3-to-2 encoder with a power consumption of 14 W at 32 GS/s by the soft-decision circuit itself. "
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    ABSTRACT: A low-complexity soft-decision 12.5 Gb/s optical receiver for decoding low-density parity-check codes reusing conventional hard-decision receivers is investigated. The simulated and experimental results show that the proposed optical receiver exhibits coding gains of 2.75 and 6.73 dB for post-forward-error-correction bit error rates of 10<sup>-4</sup> and 10<sup>-9</sup>, respectively, over a hard-decision uncoded system for a 60 km single-mode optical fiber transmission. The soft-decision circuitry consumes approximately 5 W and is optimized to provide two confidence levels, one above and one below the hard-decision levels.
    Full-text · Article · Jul 2011 · Journal of Optical Communications and Networking
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    • "Promising works are looking into a simplified structure enabling the same performance [12] [13]. Research activities related to LDPC algorithms for optical communication are mostly focused on simulation studies with a few experimental demonstrations [17] [18] [19] [20] [21] [22]. In [17] [18] [19] [20] a novel soft-decision all-electrical front end is demonstrated where the soft-decision bits are provided by a 3-to-2 encoder with a power consumption of 14 W at 32 GS/s by the soft-decision circuit itself. "
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    ABSTRACT: We investigate a soft decision decoder for LDPC codes with long-block size. The results show a coding gain of 5.9 dB compared to an uncoded system and 1.5 dB over a hard decision receiver.
    Full-text · Article · Jan 2011
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    ABSTRACT: We demonstrate a method of LP01/LP11 dual-mode and dual-polarization coherent OFDM detection at 107 Gb/s. Successful reception is achieved over a 4.5-km two-mode fiber with a grating-based mode converter as a mode-selective element.
    No preview · Conference Paper · Mar 2011
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