2019
DOI: 10.1364/oe.27.000110
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C-band PAM-4 signal transmission using soft-output MLSE and LDPC code

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Cited by 21 publications
(4 citation statements)
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“…self-phase modulation). Specifically in this implementation, soft-output MLSE based on Bahl, Cocke, Jelinek, and Raviv algorithm [17] is performed considering a channel memory equal to 2. As input values, the soft-decision FEC (SD-FEC) decoder requires the log-likelihood ratio (LLR) of each bit.…”
Section: Digital Receiver Subsystemmentioning
confidence: 99%
“…self-phase modulation). Specifically in this implementation, soft-output MLSE based on Bahl, Cocke, Jelinek, and Raviv algorithm [17] is performed considering a channel memory equal to 2. As input values, the soft-decision FEC (SD-FEC) decoder requires the log-likelihood ratio (LLR) of each bit.…”
Section: Digital Receiver Subsystemmentioning
confidence: 99%
“…The Nyquist shaping with different roll-off factors (ROFs) is usually applied to alleviate the bandwidth requirement of electrical and optical components, 24 , 25 while probabilistic shaping (PS) distribution schemes 26 28 and forward error correction (FEC) coding with different FEC overheads (OHs) are used for enhancing the tolerance to the OSNR 29 31 Low OSNR always limits the performance of optical links, and channel impairments, such as chromatic dispersion (CD), could severely distort the signal. Therefore, an accurate and powerful monitoring scheme that can help identify and optimize the optical network would be essential.…”
Section: Introductionmentioning
confidence: 99%
“…Inter-symbol interference (ISI) is introduced and decreases the system performance due to band-limited devices and chromatic dispersion (CD)induced power fading. Digital signal processing (DSP) algorithms have been introduced to mitigate the ISI, such as the feedforward equalizer (FFE) [4], decision feedback equalizer (DFE) [5], and maximum-likelihood sequence estimation (MLSE) algorithms [6]. However, the FFE algorithm aggravates in-band high-frequency noise and DFE causes error propagation.…”
Section: Introductionmentioning
confidence: 99%