Journal ArticleDOI
Carrier Phase Estimation in Multi-Subcarrier Coherent Optical Systems
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TLDR
In this article, three different carrier phase estimation approaches for coherent optical systems based on multi-subcarrier modulation are compared in terms of both performance and complexity, while using a single subcarrier for phase estimation yields a complexity reduction without any substantial performance loss with respect to performing a separate phase estimation on all SCs.Abstract:
In this letter, we analyze three different carrier phase estimation approaches for coherent optical systems based on multi-subcarrier modulation, comparing them in terms of both performance and complexity. Averaging the estimated values on the subcarriers (SCs) significantly increases the laser linewidth tolerance at the expense of additional complexity, while using a single SC for carrier phase estimation yields a complexity reduction without any substantial performance loss with respect to performing a separate phase estimation on all SCsread more
Citations
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Journal ArticleDOI
Nonlinear mitigation on subcarrier-multiplexed PM-16QAM optical systems.
Fernando P. Guiomar,Andrea Carena,Gabriella Bosco,Luca Bertignono,Antonino Nespola,Pierluigi Poggiolini +5 more
TL;DR: It is demonstrated that, in the considered experimental scenario, the gain provided by digital backpropagation (DBP) over single-carrier (SC) transmission is similar to that achieved by SRO over MSC transmission and that the SRO phenomenon can be weakened after self-channel interference (SCI) removal through DBP.
Journal ArticleDOI
Phase Noise Compensation for Nonlinearity-Tolerant Digital Subcarrier Systems With High-Order QAM
TL;DR: A low-complexity algorithm is proposed for joint subcarrier phase noise processing, which is scalable in the number of subcarriers and recovers almost entirely the fundamental SNR penalty with respect to single-carrier systems operating at the same net data-rate.
Journal ArticleDOI
Tracking reference phase with a Kalman filter in continuous-variable quantum key distribution.
TL;DR: In simulations, the performances involving of the estimation accuracy, the actual excess noise and the secret key rate are compared between with four different phase estimation methods, and the results show that the vector Kalman filter is superior to the other methods, even though under a serious phase noise and a large optical frequency difference.
Journal ArticleDOI
Joint Carrier-Phase Estimation for Digital Subcarrier Multiplexing Systems With Symbol-Rate Optimization
TL;DR: It is demonstrated that signal-to-noise ratio (SNR) gains can be achieved through joint-subcarrier CPE processing in shorter-reach links, while this gain tends to progressively reduce with increasing propagation distance, down to about 0.5 dB gain after 3000 km propagation.
Journal ArticleDOI
Enhanced Phase Estimation for Long-Haul Multi-Carrier Systems Using a Dual-Reference Subcarrier Approach
TL;DR: In this paper, a joint-subcarrier carrier phase estimation (CPE) method based on a dual-reference subcarrier (DRS) approach is described and numerically assessed, which exploits the frequency-dependent walkoff effect imposed by chromatic dispersion (CD) to enable the separation of phase noise processes incurred by the transmitter and local oscillator lasers.
References
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Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission
TL;DR: A class of nonlinear estimation algorithms is described to estimate the unknown phase of a carrier which is fully modulated by m -ary PSK modulation, and the effect of quantization and finite read-only-memory implementation of the nonlinearity are determined by computer simulation.
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Optimizing the subcarrier granularity of coherent optical communications systems.
Liang B. Du,Arthur J. Lowery +1 more
TL;DR: The findings of the paper suggest that the maximum capacity of nonlinear dispersive optical links can only be achieved by using multiple subcarriers carrying a few Gbaud each, and not by high symbol rate systems.
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Ultrahigh-Speed Signal Transmission Over Nonlinear and Dispersive Fiber Optic Channel: The Multicarrier Advantage
William Shieh,Yan Tang +1 more
TL;DR: In this article, a multiband DFT-spread OFDM (MB-DFT-S-OFDM) is proposed to reduce the peak-to-average power ratio (PAPR) within each subband.
Proceedings ArticleDOI
A triple-concatenated FEC using soft-decision decoding for 100 Gb/s optical transmission
Yoshikuni Miyata,Kenya Sugihara,Wataru Matsumoto,Kiyoshi Onohara,Takashi Sugihara,K. Kubo,Hideo Yoshida,Takashi Mizuochi +7 more
TL;DR: A novel triple-concatenated forward error correction for 100 Gb/s transmission with a net coding gain of 10.8 dB is obtained by a soft-decision LPDC code concatenated with the enhanced FEC listed in G.975.1.
Proceedings ArticleDOI
Subcarrier multiplexing using DACs for fiber nonlinearity mitigation in coherent optical communication systems
TL;DR: This work experimentally generates subcarrier multiplexed signals using high-speed DACs and demonstrates the improved nonlinearity tolerance over single carrier signals in long-haul coherent optical transmission systems.
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