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J M Tang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Demonstrations and Extensive Comparisons of End-to-End Real-Time Optical OFDM Transceivers With Adaptive Bit and/or Power Loading
    IEEE Photonics Journal, 2011
    Co-Authors: X.q. Jin, Terry Quinlan, J. L. Wei, Roger Phillip Giddings, S. Walker, J M Tang
    Abstract:

    Experimental demonstrations are reported for end-to-end real-time optical orthogonal frequency division multiplexing (OOFDM) transceivers incorporating three widely adopted adaptive Loading techniques, namely, Power Loading (PL), bit Loading (BL), and bit-and-Power Loading (BPL). In directly modulated distributed-feedback (DFB) laser-based, intensity-modulation, and direct-detection (IMDD) transmission systems consisting of up to 35-km single-mode fibers (SMFs), extensive experimental comparisons between these adaptive Loading techniques are made in terms of maximum achievable signal bit rate, optical Power budget, and digital signal processing (DSP) resource usage. It is shown that BPL is capable of supporting end-to-end real-time OOFDM transmission of 11.75 Gb/s over 25-km SMFs in the aforementioned systems at sampling speeds as low as 4 GS/s. In addition, experimental measurements also show that BPL (PL) offers the highest (lowest) signal bit rate, and their optical Power budgets are similar. The observed signal bit rate difference between BPL and PL is almost independent of sampling speed and transmission distance. All the aforementioned key features agree very well with numerical simulations. On the other hand, BPL-consumed DSP resources are approximately three times higher than those required by PL. The results indicate that PL is a preferred choice for cost-effective OOFDM transceiver design.

  • statistical performance comparisons of optical ofdm adaptive Loading algorithms in multimode fiber based transmission systems
    IEEE Photonics Journal, 2010
    Co-Authors: Elias Giacoumidis, A. Tsokanos, J M Tang
    Abstract:

    Detailed statistical investigations of the effectiveness of three widely adopted optical orthogonal frequency division multiplexing (OOFDM) adaptive Loading algorithms, including Power Loading (PL), bit Loading, and bit-and-Power Loading (BPL), are undertaken, for the first time, over 1000 statistically constructed worst-case multimode fiber (MMF) links without incorporating inline optical amplification. It is shown that the BPL (PL) algorithm always offers the best (worst) transmission performance. The absolute transmission capacity differences between these algorithms are independent of signal bit rate and increase with both transmission distance and digital-to-analog converter/analog-to-digital converter (DAC/ADC) sampling rate. More importantly, numerical results also indicate that, for both worst-case and normal-case MMF links of less than 300 m, in comparison with the most sophisticated BPL algorithm, the simplest PL algorithm is sufficiently effective in escalating the OOFDM MMF system performance to its maximum potential. The effectiveness of the PL algorithm can be further improved when a large number of subcarriers are utilized. On the other hand, for relatively long MMF links (> 800 m) with their 3-dB bandwidths being much less than the transmitted OOFDM signal spectrum, the BPL algorithm has to be adopted. The aforementioned results have great potential for practical cost-effective OOFDM transceiver architecture design.

  • experimental demonstration of a record high 11 25gb s real time optical ofdm transceiver supporting 25km smf end to end transmission in simple imdd systems
    Optics Express, 2010
    Co-Authors: Roger Phillip Giddings, Elias Giacoumidis, E Huguessalas, J M Tang
    Abstract:

    The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable Power Loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live system parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high electrical spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor single-mode fibres is successfully achieved with respective Power penalties of 0.3dB and −0.2dB at a BER of 1.0 × 10−3 in a directly modulated DFB laser-based intensity modulation and direct detection system without in-line optical amplification and chromatic dispersion compensation. The impacts of variable Power Loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable Power Loading is an extremely effective means of escalating system performance to its maximum potential.

  • first experimental demonstration of 6gb s real time optical ofdm transceivers incorporating channel estimation and variable Power Loading
    Optics Express, 2009
    Co-Authors: R P Giddings, X.q. Jin, J M Tang
    Abstract:

    The fastest ever 6Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing channel estimation are experimentally demonstrated, for the first time, with variable Power Loading being incorporated to effectively compensate for the rapid system frequency response roll-off effect. The implemented transceivers are constructed entirely from off-the-shelf components and incorporate crucial functionalities of on-line performance monitoring and live optimization of key parameters including signal clipping, subcarrier Power and operating conditions of directly modulated DFB lasers (DMLs). Real-time end-to-end transmission of a 6Gb/s 16-QAM-encoded OOFDM signal over 300m OM1 multi-mode fiber with a Power penalty of 0.5dB is successfully achieved in an intensity-modulation and direct-detection system employing a DML.

Roger Phillip Giddings - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Demonstrations and Extensive Comparisons of End-to-End Real-Time Optical OFDM Transceivers With Adaptive Bit and/or Power Loading
    IEEE Photonics Journal, 2011
    Co-Authors: X.q. Jin, Terry Quinlan, J. L. Wei, Roger Phillip Giddings, S. Walker, J M Tang
    Abstract:

    Experimental demonstrations are reported for end-to-end real-time optical orthogonal frequency division multiplexing (OOFDM) transceivers incorporating three widely adopted adaptive Loading techniques, namely, Power Loading (PL), bit Loading (BL), and bit-and-Power Loading (BPL). In directly modulated distributed-feedback (DFB) laser-based, intensity-modulation, and direct-detection (IMDD) transmission systems consisting of up to 35-km single-mode fibers (SMFs), extensive experimental comparisons between these adaptive Loading techniques are made in terms of maximum achievable signal bit rate, optical Power budget, and digital signal processing (DSP) resource usage. It is shown that BPL is capable of supporting end-to-end real-time OOFDM transmission of 11.75 Gb/s over 25-km SMFs in the aforementioned systems at sampling speeds as low as 4 GS/s. In addition, experimental measurements also show that BPL (PL) offers the highest (lowest) signal bit rate, and their optical Power budgets are similar. The observed signal bit rate difference between BPL and PL is almost independent of sampling speed and transmission distance. All the aforementioned key features agree very well with numerical simulations. On the other hand, BPL-consumed DSP resources are approximately three times higher than those required by PL. The results indicate that PL is a preferred choice for cost-effective OOFDM transceiver design.

  • experimental demonstration of a record high 11 25gb s real time optical ofdm transceiver supporting 25km smf end to end transmission in simple imdd systems
    Optics Express, 2010
    Co-Authors: Roger Phillip Giddings, Elias Giacoumidis, E Huguessalas, J M Tang
    Abstract:

    The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable Power Loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live system parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high electrical spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor single-mode fibres is successfully achieved with respective Power penalties of 0.3dB and −0.2dB at a BER of 1.0 × 10−3 in a directly modulated DFB laser-based intensity modulation and direct detection system without in-line optical amplification and chromatic dispersion compensation. The impacts of variable Power Loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable Power Loading is an extremely effective means of escalating system performance to its maximum potential.

X.q. Jin - One of the best experts on this subject based on the ideXlab platform.

  • Experimental Demonstrations and Extensive Comparisons of End-to-End Real-Time Optical OFDM Transceivers With Adaptive Bit and/or Power Loading
    IEEE Photonics Journal, 2011
    Co-Authors: X.q. Jin, Terry Quinlan, J. L. Wei, Roger Phillip Giddings, S. Walker, J M Tang
    Abstract:

    Experimental demonstrations are reported for end-to-end real-time optical orthogonal frequency division multiplexing (OOFDM) transceivers incorporating three widely adopted adaptive Loading techniques, namely, Power Loading (PL), bit Loading (BL), and bit-and-Power Loading (BPL). In directly modulated distributed-feedback (DFB) laser-based, intensity-modulation, and direct-detection (IMDD) transmission systems consisting of up to 35-km single-mode fibers (SMFs), extensive experimental comparisons between these adaptive Loading techniques are made in terms of maximum achievable signal bit rate, optical Power budget, and digital signal processing (DSP) resource usage. It is shown that BPL is capable of supporting end-to-end real-time OOFDM transmission of 11.75 Gb/s over 25-km SMFs in the aforementioned systems at sampling speeds as low as 4 GS/s. In addition, experimental measurements also show that BPL (PL) offers the highest (lowest) signal bit rate, and their optical Power budgets are similar. The observed signal bit rate difference between BPL and PL is almost independent of sampling speed and transmission distance. All the aforementioned key features agree very well with numerical simulations. On the other hand, BPL-consumed DSP resources are approximately three times higher than those required by PL. The results indicate that PL is a preferred choice for cost-effective OOFDM transceiver design.

  • first experimental demonstration of 6gb s real time optical ofdm transceivers incorporating channel estimation and variable Power Loading
    Optics Express, 2009
    Co-Authors: R P Giddings, X.q. Jin, J M Tang
    Abstract:

    The fastest ever 6Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing channel estimation are experimentally demonstrated, for the first time, with variable Power Loading being incorporated to effectively compensate for the rapid system frequency response roll-off effect. The implemented transceivers are constructed entirely from off-the-shelf components and incorporate crucial functionalities of on-line performance monitoring and live optimization of key parameters including signal clipping, subcarrier Power and operating conditions of directly modulated DFB lasers (DMLs). Real-time end-to-end transmission of a 6Gb/s 16-QAM-encoded OOFDM signal over 300m OM1 multi-mode fiber with a Power penalty of 0.5dB is successfully achieved in an intensity-modulation and direct-detection system employing a DML.

Elias Giacoumidis - One of the best experts on this subject based on the ideXlab platform.

  • statistical performance comparisons of optical ofdm adaptive Loading algorithms in multimode fiber based transmission systems
    IEEE Photonics Journal, 2010
    Co-Authors: Elias Giacoumidis, A. Tsokanos, J M Tang
    Abstract:

    Detailed statistical investigations of the effectiveness of three widely adopted optical orthogonal frequency division multiplexing (OOFDM) adaptive Loading algorithms, including Power Loading (PL), bit Loading, and bit-and-Power Loading (BPL), are undertaken, for the first time, over 1000 statistically constructed worst-case multimode fiber (MMF) links without incorporating inline optical amplification. It is shown that the BPL (PL) algorithm always offers the best (worst) transmission performance. The absolute transmission capacity differences between these algorithms are independent of signal bit rate and increase with both transmission distance and digital-to-analog converter/analog-to-digital converter (DAC/ADC) sampling rate. More importantly, numerical results also indicate that, for both worst-case and normal-case MMF links of less than 300 m, in comparison with the most sophisticated BPL algorithm, the simplest PL algorithm is sufficiently effective in escalating the OOFDM MMF system performance to its maximum potential. The effectiveness of the PL algorithm can be further improved when a large number of subcarriers are utilized. On the other hand, for relatively long MMF links (> 800 m) with their 3-dB bandwidths being much less than the transmitted OOFDM signal spectrum, the BPL algorithm has to be adopted. The aforementioned results have great potential for practical cost-effective OOFDM transceiver architecture design.

  • experimental demonstration of a record high 11 25gb s real time optical ofdm transceiver supporting 25km smf end to end transmission in simple imdd systems
    Optics Express, 2010
    Co-Authors: Roger Phillip Giddings, Elias Giacoumidis, E Huguessalas, J M Tang
    Abstract:

    The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable Power Loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live system parameter optimization and channel estimation. Real-time end-to-end transmission of an 11.25Gb/s 64-QAM-encoded OOFDM signal with a high electrical spectral efficiency of 5.625bit/s/Hz over 25km of standard and MetroCor single-mode fibres is successfully achieved with respective Power penalties of 0.3dB and −0.2dB at a BER of 1.0 × 10−3 in a directly modulated DFB laser-based intensity modulation and direct detection system without in-line optical amplification and chromatic dispersion compensation. The impacts of variable Power Loading as well as electrical and optical components on the transmission performance of the demonstrated transceivers are experimentally explored in detail. In addition, numerical simulations also show that variable Power Loading is an extremely effective means of escalating system performance to its maximum potential.

P P Vaidyanathan - One of the best experts on this subject based on the ideXlab platform.

  • transceiver design with vector perturbation technique and iterative Power Loading
    International Conference on Acoustics Speech and Signal Processing, 2009
    Co-Authors: Chingchih Weng, P P Vaidyanathan
    Abstract:

    In this paper we consider the optimization of transceivers which use the nonlinear vector perturbation technique at the transmitter. Since the perturbation vector can be almost totally removed at the receiver, the transmitter can use this extra freedom to reduce the transmitted Power while maintaining the performance. The two cases considered in this paper are linear transceivers and transceivers with decision feedback (DFE). For both cases, efficient iterative Power Loading algorithms are developed to reduce the average bit error rate under the total transmitted Power constraint. We present simulation results showing that the proposed technique performs better than the existing state-of-the-art uniform channel decomposition (UCD) system and the vector perturbation (VP) precoder.