Showing papers by "Norbert Hanik published in 2013"
12 Nov 2013
TL;DR: In this article, a synchronization algorithm for coherent OFDMA-PON upstream is proposed, and the feasibility of the tracking functionality is experimentally investigated at the ONU with a differential delay of up to 37.6 ns.
Abstract: A synchronization algorithm for coherent OFDMA-PON upstream is proposed. The feasibility of the tracking functionality is experimentally investigated. A differential delay of up to 37.6 ns was tracked and could be compensated at the ONU.
12 citations
17 Mar 2013
TL;DR: It is confirmed that OFDM can significantly reduce the required DSP complexity to compensate for differential mode delay, a key step towards real-time MDM transmission.
Abstract: We demonstrate 337.5-Gb/s MDM-8QAM-OFDM transmission over 130 km of FMF. This confirms that OFDM can significantly reduce the required DSP complexity to compensate for differential mode delay, a key step towards real-time MDM transmission.
12 citations
30 Jun 2013
TL;DR: In this paper, a fiber nonlinearity compensation via expectation maximization for PDM CO-OFDM was investigated for 1000-km 700 Gb/s WDM transmission.
Abstract: Fiber nonlinearity compensation via expectation maximization is investigated for PDM CO-OFDM. An improvement in Q-factor of 0.33 dB is observed for 1400-km 100 Gb/s single channel and 1.44 dB for 1000-km 700 Gb/s WDM transmission.
3 citations
30 Jun 2013
TL;DR: In this paper, the complexity of MIMO-equalizers in both strongly and weakly-coupled FMF transmission systems was analyzed and it was shown that the blind equalizer in the latter system has significantly smaller complexity than that in the former system.
Abstract: We analyze the complexity of MIMO-equalizers in both strongly and weakly-coupled FMF transmission systems. We found that the blind equalizer in the latter system has significantly smaller complexity than that in the former system.
2 citations
01 Jan 2013
TL;DR: Simulations show that IQ is an accurate estimate of the system performance and is used to define decoding thresholds for soft-decision decoding.
Abstract: A novel quantity called IQ-factor is proposed that facilitates the analysis of soft-decision decoding. The IQ-factor is based on mutual information and naturally relates to the Q-factor. We use IQ to define decoding thresholds. Simulations show that IQ is an accurate estimate of the system performance.
2 citations
23 Jun 2013
TL;DR: This limit, which is valid for any optical channel model, is compared with a trellis coded modulation (TCM) system and with a regular low-density parity-check (LDPC) code in order to evaluate the gap in performance due to imperfection in the code design.
Abstract: Mutual information (MI) is derived as an information-theoretical figure of merit to assess the performance bounds of an optical long-haul communication system when forward error correction is used. This limit, which is valid for any optical channel model, is compared with a trellis coded modulation (TCM) system and with a regular low-density parity-check (LDPC) code in order to evaluate the gap in performance due to imperfection in the code design.