Showing papers by "Norbert Hanik published in 2010"
04 Nov 2010
TL;DR: A pilot-tone based phase noise compensation method for the mitigation of nonlinearities in OFDM transmission and allows for the compensation of XPM-induced transmission impairments without direct knowledge of the optical field of the co-propagating channels.
Abstract: We propose a pilot-tone based phase noise compensation method for the mitigation of nonlinearities in OFDM transmission. This scheme allows for the compensation of XPM-induced transmission impairments without direct knowledge of the optical field of the co-propagating channels.
47 citations
TL;DR: In this paper, the authors investigate, by means of simulations, polarization-multiplexed (PolMux) quadrature duobinary (QDB) as a modulation format for transmitting 111-Gb/s signals with high spectral efficiency (SE) and acceptable system complexity.
Abstract: We investigate, by means of simulations, polarization-multiplexed (PolMux) quadrature duobinary (QDB) as a modulation format for transmitting 111-Gb/s signals with high spectral efficiency (SE) and acceptable system complexity. We show that PolMux-QDB can be used to transmit 111-Gb/s signals with an SE of 4-b/s/Hz, but at the same time has a higher tolerance to nonlinear transmission effects and local oscillator laser linewidth compared to PolMux-16QAM at the same data rate and SE.
23 citations
21 Mar 2010
TL;DR: This work describes how simulations based on the Split-Step Fourier Method can be significantly accelerated by using commodity graphics hardware.
Abstract: We describe how simulations based on the Split-Step Fourier Method can be significantly accelerated by using commodity graphics hardware. Results for a benchmark scenario are provided to highlight performance and accuracy.
8 citations
21 Mar 2010
TL;DR: A novel technique that allows direct detection of multicarrier signals without using DSP at the receiver is proposed and performance at 55.5 Gb/s, back-to-back and after 1040 km of dispersion uncompensated link is assessed.
Abstract: We propose a novel technique that allows direct detection of multicarrier signals without using DSP at the receiver. Performance at 55.5 Gb/s, back-to-back and after 1040 km of dispersion uncompensated link is assessed by simulations.
4 citations
05 Jul 2010
TL;DR: In this article, by means of simulations, polarization multiplexed (PolMux) quadrature duobinary (QDB) was investigated as a modulation format for transmitting 111 Gb/s signals with high spectral efficiency, robust performance and acceptable system complexity.
Abstract: We investigate, by means of simulations, polarization multiplexed (PolMux) quadrature duobinary (QDB) as a modulation format for transmitting 111 Gb/s signals with high spectral efficiency, robust performance and acceptable system complexity.
3 citations
TL;DR: The principle behind electronic predistortion will be revised and different methods to implement this method will be explained and how the complexity scales for increasing channel data rates will be highlighted.
Abstract: Electronic predistortion is a powerful technique to combat transmission impairments on fiber-optic communication links. The principle behind electronic predistortion will be revised and different methods to implement this method will be explained. In addition to that, we will focus on the implementation complexity of this scheme and we will highlight how the complexity scales for increasing channel data rates.
3 citations
21 Mar 2010
TL;DR: Using a global optimization algorithm, this work maximizes the reach of DPSK and DQPSK systems including PMD and nonlinear phase noise at data rates ranging from 5 Gbit/s to 230 Gbits/s.
Abstract: Using a global optimization algorithm, we maximize the reach of DPSK and DQPSK systems including PMD and nonlinear phase noise at data rates ranging from 5 Gbit/s to 230 Gbit/s.
1 citations
16 Aug 2010
TL;DR: In this article, the authors present Stereo Multiplexing, a technique that permits simultaneous direct detection of two modulated optical carriers by modulating the optical carriers with the difference and the sum of two signals.
Abstract: We present Stereo Multiplexing, a novel technique that permits simultaneous direct detection of two modulated optical carriers. This is accomplished by modulating the optical carriers with the difference and the sum of two signals. The linear performance of Stereo-multiplexed DQPSK signals is compared to single-carrier DQPSK and dual-carrier DQPSK. Subsequently, by means of simulations, the robustness of each format is compared after DWDM transmission of 55.5 Gb/s through 1040 km of SMF. This is done by searching the optimum dispersion map and input powers for each format and looking at the stability of the performance around the optimum. We show that the best performance and robustness is obtained by sharing the information between two carriers, and that Stereo is only 1 dB below dual-carrier NRZ-DQPSK. This small penalty can be tolerated if cost and complexity at the receiver side must be kept low.
1 citations
21 Jun 2010
TL;DR: Digital Subcarrier Multiplexing allows simple direct detection of multicarrier signals by differentially encoding in symbol-wise manner, and the tolerance to nonlinearities and dispersion is remarkably improved.
Abstract: Digital Subcarrier Multiplexing allows simple direct detection of multicarrier signals. We show, by means of simulations, that by differentially encoding in symbol-wise manner, the tolerance to both, nonlinearities and dispersion, is remarkably improved.
1 citations
05 Jul 2010
TL;DR: In this paper, the authors show that linear equalization is more effective in increasing the dispersion tolerance of DSM than of its single-carrier equivalent, by means of simulations.
Abstract: Digital Subcarrier Multiplexing (DSM) allows simple direct detection of multi-carrier signals. We show, by means of simulations, that linear equalization is more effective in increasing the dispersion tolerance of DSM than of its single-carrier equivalent.
TL;DR: In this paper, the mutual information between a complex-valued channel input and its complexvalued output is decomposed into four parts based on polar coordinates: an amplitude term, a phase term, and two mixed terms.
Abstract: The mutual information between a complex-valued channel input and its complex-valued output is decomposed into four parts based on polar coordinates: an amplitude term, a phase term, and two mixed terms. Numerical results for the additive white Gaussian noise (AWGN) channel with various inputs show that, at high signal-to-noise ratio (SNR), the amplitude and phase terms dominate the mixed terms. For the AWGN channel with a Gaussian input, analytical expressions are derived for high SNR. The decomposition method is applied to partially coherent channels and a property of such channels called "spectral loss" is developed. Spectral loss occurs in nonlinear fiber-optic channels and it may be one effect that needs to be taken into account to explain the behavior of the capacity of nonlinear fiber-optic channels presented in recent studies.