Advances in Detection and Error correction For coherent Optical Communications: Regular, Irregular, and Spatially Coupled LDPC Code Designs

Schmalen, Laurent; Brink, Stephan ten; Leven, A.

doi:10.1002/9781119078289.ch3

Cited by 6 publications

(2 citation statements)

References 75 publications

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“…Due to this ambiguity, without any reference of the absolute phase, the phase cannot be aligned and successful transmission can therefore not be assumed when using standard PM-MQAM formats and normal bit encoding, regardless of how accurate the CPE algorithm itself is. One way of overcoming this is to use differential encoding but this comes with the price of reduced information rate and requires special FEC design [33].…”

Section: Synchronizationmentioning

confidence: 99%

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

et al. 2019

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We present a low-complexity fully pilot-based digital signal processing (DSP) chain designed for high spectral efficiency optical transmission systems. We study the performance of the individual pilot algorithms in simulations before demonstrating transmission of a 51×24 Gbaud PM-64QAM superchannel over distances reaching 1000 km. We present an overhead optimization technique using the system achievable information rate to find the optimal balance between increased performance and throughput reduction from adding additional DSP pilots. Using the optimal overhead of 2.4%, we report 9.3 (8.3) bits/s/Hz spectral efficiency, or equivalently 11.9 (10.6) Tb/s superchannel throughput, after 480 (960) km of transmission over 80 km spans with EDFA-only amplification. Moreover, we show that the optimum overhead depends only weakly on transmission distance, concluding that back-to-back optimization is sufficient for all studied distances. Our results show that pilot-based DSP combined with overhead optimization can increase the robustness and performance of systems using advanced modulation formats while still maintaining state-of-the-art spectral efficiency and multi-Tb/s throughput.

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Section: Synchronizationmentioning

confidence: 99%

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

et al. 2019

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“…LDPC codes stand out for their excellent performance close to the Shannon limit, which has the remarkable advantage of consistently low BER. This characteristic makes LDPC codes an indispensable part of optical fiber communications, and they play an important role in advancing the quality and efficiency of communication [13]. LDPC codes have also emerged as a crucial tool in ensuring reliable and high-performance data transmission over long distances in optical fiber communication systems.…”

Section: Construction Of Ieee 80216e Standard H-matrixmentioning

confidence: 99%

Investigation of IEEE 802.16e LDPC Code Application in PM-DQPSK System

Xue,

Li,

Zhang

et al. 2024

Electronics

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With the development of the Internet and information technology, optical fiber communication systems need to meet people’s information demand for large capacity and high speed. High-order phase modulation and channel multiplexing can improve the capacity and data rate of optical fiber communication systems, but they also bring the problem of bit error. To improve the transmission quality and reliability of optical fiber communication systems, forward error correction (FEC) coding techniques are commonly used, which serve as the fundamental approach to enhance the quality and reliability of fiber optic communication systems, ensuring that the received data remain accurate and reliable. The FEC in optical fiber communication systems is divided into three generations. The first generation FEC is mainly hard decision codewords, represented as RS code. The second generation FEC is mainly cascaded code, which stands for interleaved cascaded code. The third generation of FEC mainly refers to soft decision codes, which are represented as low-density parity-check (LDPC) codes. As a kind of FEC, LDPC codes stand out as pivotal contributors in the field of optical communication and have gained remarkable attention due to exceptional error correction performance and low decoding complexity. Based on IEEE802.16e standard, LDPC code with specific code length and rate is compiled and simulated in MATLAB and VPItransmissionMaker 10.1 and successfully incorporated into polarization multiplexed differential quadrature phase shift keying (PM-DQPSK) coherent optical transmission system. The simulation results indicate that the bit error rate (BER) can be reduced to 10−3 when the optical signal-to-noise ratio (OSNR) reaches 14.2 dB, and the BER experiences a reduction by nearly three orders of magnitude when the OSNR is 17.2 dB. These findings underscore the efficacy of LDPC codes in significantly improving the performance of optical communication systems, particularly in scenarios demanding robust error correction capabilities. This study provides valuable, significant results regarding the potential of LDPC codes for enhancing the reliability of optical transmission in real-world applications.

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Performance Prediction of Nonbinary Forward Error Correction in Optical Transmission Experiments

Schmalen

Alvarado

Rios-Müller

2017

J. Lightwave Technol.

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In this paper, we compare different metrics to predict the error rate of optical systems based on nonbinary forward error correction (FEC). It is shown that an accurate metric to predict the performance of coded modulation based on nonbinary FEC is the mutual information. The accuracy of the prediction is verified in a detailed example with multiple constellation formats and FEC overheads, in both simulations and optical transmission experiments over a recirculating loop. It is shown that the employed FEC codes must be universal if performance prediction based on thresholds is used. A tutorial introduction into the computation of the thresholds from optical transmission measurements is also given.

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Advances in Detection and Error correction For coherent Optical Communications: Regular, Irregular, and Spatially Coupled LDPC Code Designs

Cited by 6 publications

References 75 publications

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

Overhead-optimization of pilot-based digital signal processing for flexible high spectral efficiency transmission

Investigation of IEEE 802.16e LDPC Code Application in PM-DQPSK System

Performance Prediction of Nonbinary Forward Error Correction in Optical Transmission Experiments

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