Nonlinear Equalizer Based on Absolute Operation for IM/DD System Using DML

Yu, Yukui; Choi, Myeong Ryeol; Bo, Tianwai; Che, Yi; Kim, Daeho; Kim, Hoon

doi:10.1109/lpt.2020.2978222

Cited by 25 publications

(3 citation statements)

References 13 publications

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“…Moreover, MZMs suffer from the bias‐drift problem [16]. Directed modulated distributed feedback laser (DML)‐based optical Fast‐OFDM links may also be used [6], but the DML non‐linearity may cause significant waveform distortions [17]. Thus, the use of some linearisation and/or peak‐to‐average power ratio (PAPR) reduction approach might be necessary to alleviate the signal distortion issue.…”

Section: Introductionmentioning

confidence: 99%

Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems

Vieira

Ozan

Mitchell

et al. 2023

IET Optoelectronics

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Fast‐OFDM‐based intensity‐modulation and direct‐detection (IM/DD) has been proposed for deployment of cost‐efficient optical access networks, due to its implementation simplicity and high spectral efficiency. In this article, the accuracy of the generalised memory polynomial (GMP) for the non‐linear modelling of optical Fast‐OFDM links is studied, including memory effects and considering different model parameters. After model validation using measured data of a 10 km single mode fibre link, the GMP is used for performance investigations of a distortion compensation approach to optical Fast‐OFDM, for up to 16PAM modulation formats and different number of Fast‐OFDM subcarriers. This study firstly reports the performance results of optical 16PAM‐Fast‐OFDM systems using either 2PAM‐ or 4PAM‐based training signals for digital post‐distortion and FFT‐based channel estimation, and firstly investigates the influence of the zero padding (ZP) length on the performance of optical Fast‐OFDM. Excellent performance improvements are achieved using the proposed distortion compensation scheme, relative to conventional system implementation.

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Section: Introductionmentioning

confidence: 99%

Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems

Vieira

Ozan

Mitchell

et al. 2023

IET Optoelectronics

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show abstract

“…It's a effective way to reduce bandwidth limitation effect by using advanced signal modulation format. Due to its simple structure and low energy consumption, pulse amplitude modulation (PAM) has attracted wide attention [4][5] . The main harmful effect of bandwidth restriction is waveform distortion caused by inter-symbol interference (ISI).…”

Section: Introductionmentioning

confidence: 99%

Demonstration of 112Gb/s PAM4/6 signal transmission in IM/DD systems using MLSE

Xie,

Li,

et al. 2023

AOPC 2023: AI in Optics and Photonics

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“…In this regard, the Volterra nonlinear filter has attracted many researchers' interest because of its good nonlinear recovery ability [14][15][16][17][18][19][20]. The Volterra nonlinear filter has strong recovery capability, but its complexity is also very high, so it cannot be applied in cost-sensitive direct modulation direct detection short-range applications [21]. Simplifying the Volterra nonlinear filter applied in the direct modulation direct detection system is a relatively mainstream research direction at present, which mainly includes two methods: one is to directly adjust the structure of the Volterra nonlinear filter, and remove part of the structure, thus reducing the complexity of the algorithm, such as diagonal trimming of the Volterra nonlinear filter [22]; the other is to preprocess according to the current system characteristics to obtain the structural characteristics of the Volterra nonlinear filter at this time, so as to carry out targeted simplification [17].…”

Section: Introductionmentioning

confidence: 99%

A Simplified Volterra Equalizer Based on System Characteristics for Direct Modulation Laser (DML)-Based Intensity Modulation and Direct Detection (IM/DD) Transmission Systems

Feng,

Li,

et al. 2023

Photonics

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The nonlinear Volterra equalizer has been proved to be able to solve the problem of nonlinear distortion, but it has high computational complexity and is difficult to implement. In this paper, a simplified second-order Volterra nonlinear equalizer designed for intensity modulation/direct detection systems based on direct modulated laser is proposed and demonstrated, taking into account the characteristics of the system. It has been proved that the received signal of direct modulation laser/direct detection system can be expressed in Volterra series form, but its form is too complex, and the device parameters should also be considered. We re-derived it and obtained a more concise form. At the same time, we proposed a method to simplify the second-order Volterra nonlinear equalizer without relying on device parameters. The performance of the proposed Volterra nonlinear equalizer is evaluated experimentally on a 56 Gb/s 4-ary pulse amplitude modulation link implemented by using a 1.55 µm direct modulation laser. The results show that, compared with the traditional Volterra nonlinear equalizer, the receiver sensitivity of the equalizer is only reduced by 0.2 dB at most, but the complexity can be reduced by 50%; compared with diagonally pruned Volterra nonlinear equalizers, the complexity of the equalizer is the same, but the reception sensitivity can be improved by 0.5 dB.

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Nonlinear Equalizer Based on Absolute Operation for IM/DD System Using DML

Cited by 25 publications

References 13 publications

Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems

Non‐linear modelling and distortion compensation in optical Fast‐orthogonal frequency division multiplexing systems

Demonstration of 112Gb/s PAM4/6 signal transmission in IM/DD systems using MLSE

A Simplified Volterra Equalizer Based on System Characteristics for Direct Modulation Laser (DML)-Based Intensity Modulation and Direct Detection (IM/DD) Transmission Systems

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