Journal ArticleDOI
Increase in Capacity of an IM/DD OFDM-PON Using Super-Nyquist Image-Induced Aliasing and Simplified Nonlinear Equalization
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TLDR
In this article, a joint chromatic dispersion (CD) and nonlinearity compensation technique using super-Nyquist image-induced aliasing and a Volterra series-based simplified nonlinear equalizer (SNE) was investigated in a decision feedback manner.Abstract:
For long reach passive optical networks, double-sideband intensity modulation and direct detection can offer the advantages of low cost and low complexity. In this paper, we investigate a joint chromatic dispersion (CD) and nonlinearity compensation technique using super-Nyquist image-induced aliasing and a Volterra series-based simplified nonlinear equalizer (SNE) in a decision feedback manner. The SNE employed in our experiments offers signal-to-noise ratio (SNR) performance comparable to the conventional nonlinear equalizers (NE), but with much fewer coefficients. The distribution of the nonlinear coefficients and the memory length of the SNE/NE are also investigated. Experimental results show that with the proposed aliasing-based CD compensation technique combined with SNE used in each down-sampled signal before per-subcarrier maximum ratio combining, the SNR can be significantly improved. The data rate of the 10-GHz optical OFDM signals is increased by 45%, 52%, and 51% after 48.8, 79.2, and 99.6 km of standard single mode fiber transmission, respectively, compared with those without CD/nonlinearity compensation.read more
Citations
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Journal ArticleDOI
Orbital-angular-momentum mode-group multiplexed transmission over a graded-index ring-core fiber based on receive diversity and maximal ratio combining
Junwei Zhang,Guoxuan Zhu,Jie Liu,Xiong Wu,Jiangbo Zhu,Cheng Du,Wenyong Luo,Yujie Chen,Siyuan Yu +8 more
TL;DR: An orbital-angular-momentum mode-group multiplexing scheme using high-order mode groups (MGs) in a graded-index ring-core fiber (GIRCF) is proposed, in which a receive-diversity architecture is designed for each MG to suppress the mode partition noise resulting from random intra-group mode crosstalk.
Journal ArticleDOI
Nonlinearity-Aware Adaptive Bit and Power Loading DMT Transmission Over Low-Crosstalk Ring-Core Fiber With Mode Group Multiplexing
TL;DR: In this paper, a low-complexity frequency-domain polynomial nonlinear equalizer (FD-PNLE) combining with adaptive bit and power loading is implemented to mitigate the modulation/detection related nonlinearities as well as modal dispersion induced highfrequency power fading.
Journal ArticleDOI
Decision-Feedback Frequency-Domain Volterra Nonlinear Equalizer for IM/DD OFDM Long-Reach PON
TL;DR: In this article, a low-complexity third-order decision-feedback frequency-domain Volterra nonlinear equalizer (DF-FD-VNLE) with superior nonlinearity-compensation performance is proposed and experimentally demonstrated for OFDM long-reach PONs.
Journal ArticleDOI
Modulation format identification based on constellation diagrams in adaptive optical OFDM systems
TL;DR: This work proposed and experimentally demonstrated a blind modulation format identification technique based on constellation diagrams achieved from channel estimation of OFDM system, and evaluated and measured the identification accuracies of QPSK,8-QAM, 8-PSk, 16- QAM, 64-Q AM and 128 QAM signals in simulation and experiment.
Journal ArticleDOI
Low-complexity sparse absolute-term based nonlinear equalizer for C-band IM/DD systems.
TL;DR: In this paper, a low-complexity sparse absolute-term based nonlinear equalizer (AT-NLE) is proposed to eliminate the nonlinear signal distortions for intensity modulation and direct detection (IM/DD) systems.
References
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Book
Nonlinear Fiber Optics
TL;DR: The field of nonlinear fiber optics has advanced enough that a whole book was devoted to it as discussed by the authors, which has been translated into Chinese, Japanese, and Russian languages, attesting to the worldwide activity in the field.
Journal ArticleDOI
A practical discrete multitone transceiver loading algorithm for data transmission over spectrally shaped channels
TL;DR: A finite-granularity, loading algorithm for a discrete multitone (DMT) modulation system that offers significant implementational advantages over the well-known water-pouring method and the earlier Hughes-Hartogs algorithm while typically suffering only negligible performance degradation relative to the optimal solution.
Journal ArticleDOI
A robust digital baseband predistorter constructed using memory polynomials
Lei Ding,Guotong Zhou,Dennis R. Morgan,Zhengxiang Ma,J.S. Kenney,Jaehyeong Kim,C.R. Giardina +6 more
TL;DR: A memory polynomial model for the predistorter is proposed and implemented using an indirect learning architecture and linearization performance is demonstrated on a three-carrier WCDMA signal.
Journal ArticleDOI
Digital predistortion of wideband signals based on power amplifier model with memory
Jungsang Kim,K. Konstantinou +1 more
TL;DR: In this paper, memory effects in the power amplifier limit the performance of digital predistortion for wideband signals, and novel algorithms that take into account such effects are proposed to solve the problem.
Journal ArticleDOI
Simple measurement of fiber dispersion and of chirp parameter of intensity modulated light emitter
F. Devaux,Y. Sorel,J.F. Kerdiles +2 more
TL;DR: In this article, the dispersion of optical fibers and chirp parameter of modulated light emitters were measured in the -10-to-10 range for optical fiber intensity modulated transmission systems.