Experimental demonstration of adaptive VFF-RLS-FDE for long-distance mode-division multiplexed transmission

Yang, Zhiqun; Zhao, Jian; Bai, Neng; Ip, Ezra; Wang, Ting; Li, Zhihong; Li, Guifang

doi:10.1364/oe.26.018362

Cited by 7 publications

(5 citation statements)

References 5 publications

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“…However, calculating the specific value of λ is always operated by division or extraction of a root, which leads to rather higher computational complexity compared that with fixed forgetting factor. To avoid higher complexity while still holding the advantages of VFF, we proposed a FD-RLS schemes with an exponential VFF in Equation ( 8) [47]:…”

Section: Rls Mimo Algorithms and Its Application On Equalization Of Tv Effectsmentioning

confidence: 99%

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Yang

Peng

et al. 2021

Applied Sciences

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This paper provides an overview of latest progress on the novel advanced digital signal processing (DSP) techniques for long-haul mode division multiplexing (MDM) systems with high capacity. Space-division multiplexing (SDM) techniques have been developed for a period to increase the capacity of optical communication system by at least one order of magnitude through MDM techniques using few-mode fibers (FMFs) or multi-core multiplexing (MCM) using multi-core fibers (MCFs). The signals in MDM links are mainly impaired by the linear and nonlinear effects in FMFs, making DSP techniques become necessary to undo these impairments. In this paper, we not only review the advanced multiple-input multiple-output (MIMO) DSP techniques for compensating linear impairments in FMFs, but also enclose the state of the art of novel DSP techniques to deal with nonlinear effects. Firstly, we introduce the MIMO schemes for equalizing modal crosstalk and modal dispersion. Then, we focus on the fast tracking of time-varying (TV) channels in FMF links through frequency-domain (FD) recursive least square (RLS) algorithm. Besides, we also cover the mainstream DSP solutions for mode-dependent loss (MDL) and several possible methods to compensate nonlinearity in FMF. Moreover, artificial intelligence (AI) technologies are also discussed for its high nonlinearity tolerance and may bring a revolution in MDM systems on the process of channel equalization, link monitoring, etc. In the end, a brief conclusion and perspective will be provided.

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Section: Rls Mimo Algorithms and Its Application On Equalization Of Tv Effectsmentioning

confidence: 99%

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Yang

Peng

et al. 2021

Applied Sciences

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“…It is necessary to study and reduce the computational complexity of SDM applications. Several works have been reported to address this issue [57][58][59][60]. Compared with the TDE method, the FDE method can significantly reduce the computational complexity while maintaining the same performance.…”

Section: Sdm and Frequency Domain Equalization (Fde)mentioning

confidence: 99%

“…We have experimentally demonstrated an RLS FDE approach for MDM with good performance. The block diagram of the proposed algorithm and experimental results are shown in Figures 15 and 16 [60]. As mentioned above, the computational complexity is determined by the degree of freedom and the differential mode group delay (DMGD).…”

Section: Sdm and Frequency Domain Equalization (Fde)mentioning

confidence: 99%

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Advanced DSP for Coherent Optical Fiber Communication

Zhao

Liu

2019

Applied Sciences

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In this paper, we provide an overview of recent progress on advanced digital signal processing (DSP) techniques for high-capacity long-haul coherent optical fiber transmission systems. Not only the linear impairments existing in optical transmission links need to be compensated, but also, the nonlinear impairments require proper algorithms for mitigation because they become major limiting factors for long-haul large-capacity optical transmission systems. Besides the time domain equalization (TDE), the frequency domain equalization (FDE) DSP also provides a similar performance, with a much-reduced computational complexity. Advanced DSP also plays an important role for the realization of space division multiplexing (SDM). SDM techniques have been developed recently to enhance the system capacity by at least one order of magnitude. Some impressive results have been reported and have outperformed the nonlinear Shannon limit of the single-mode fiber (SMF). SDM introduces the space dimension to the optical fiber communication. The few-mode fiber (FMF) and multi-core fiber (MCF) have been manufactured for novel multiplexing techniques such as mode-division multiplexing (MDM) and multi-core multiplexing (MCM). Each mode or core can be considered as an independent degree of freedom, but unfortunately, signals will suffer serious coupling during the propagation. Multi-input–multi-output (MIMO) DSP can equalize the signal coupling and makes SDM transmission feasible. The machine learning (ML) technique has attracted worldwide attention and has been explored for advanced DSP. In this paper, we firstly introduce the principle and scheme of coherent detection to explain why the DSP techniques can compensate for transmission impairments. Then corresponding technologies related to the DSP, such as nonlinearity compensation, FDE, SDM and ML will be discussed. Relevant techniques will be analyzed, and representational results and experimental verifications will be demonstrated. In the end, a brief conclusion and perspective will be provided.

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“…SDM using FMFs typically relies on multiple-input-multiple-output (MIMO) equalization algorithms to compensate mode crosstalk penalty [7]- [9]. In this case, the algorithmic complexity grows rapidly with the increase of the mode number.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Beat-Length Measurement of a Polarization-Maintaining Few-Mode Fiber

et al. 2019

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Based on the polarization interference technique, we propose a modified method for simultaneously measuring the beat length of all guided modes in a polarizationmaintaining few-mode fiber (PM-FMF). We experimentally demonstrate the effectiveness of our proposed method on a 3-mode PANDA-type PM-FMF. The simultaneous measurement results agree well with the results obtained by one-by-one measurement process. What's more, the modified measurement method is easier to be implemented and more scalable to a larger mode number.

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Experimental demonstration of adaptive VFF-RLS-FDE for long-distance mode-division multiplexed transmission

Cited by 7 publications

References 5 publications

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Recent Progress on Novel DSP Techniques for Mode Division Multiplexing Systems: A Review

Advanced DSP for Coherent Optical Fiber Communication

Simultaneous Beat-Length Measurement of a Polarization-Maintaining Few-Mode Fiber

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