Square root strategy: a novel method to linearize an optical communication system with electronic equalizers

Prat, Josep; Napoli, Antonio; Gené, Joan M.; Omella, M.; Poggiolini, Pierluigi; Curri, Vittorio

doi:10.1049/cp:20050685

Cited by 30 publications

(26 citation statements)

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“…From (24) notice that the computation of the cost function for every candidate symbol sequence { } can be achieved from the samples at the outputs of the matched filters given by (25).…”

Section: Mlsd Receiver For Nonlinear Channels With Awgnmentioning

confidence: 99%

“…It has been found that after a square root transformation, the noise can be assumed Gaussian and signal-independent [23,24]. Furthermore, channel nonlinearities can also be reduced by using the square root transformation [25], which improves the space compression used to reduce the receiver dimension (i.e., most of the channel energy is concentrated on the linear kernel). The split-step Fourier method [26] is used to compute the propagation of optical signals through the fiber.…”

Section: Performance Evaluation In Im/dd Optical Systemsmentioning

confidence: 99%

“…This result can be understood from the fact that the filters ℎ * 0 (− ) and (0) are computed from the samples of the estimated linear kernel 0 ( ). Taking into account that the energy of the linear component is significantly higher than the nonlinear kernels [25] (see Section 2.2), an accurate estimation of ℎ 0 ( ) can be achieved for the channel considered. Then, we infer that the energy loss of the signal component at the output of̂0( ) will be small.…”

Section: Impact Of the Imperfect Channel Knowledgementioning

confidence: 99%

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Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Maggio

Hueda

Agazzi³

2015

Journal of Electrical and Computer Engineering

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The space-time whitened matched filter (ST-WMF) maximum likelihood sequence detection (MLSD) architecture has been recently proposed (Maggio et al., 2014). Its objective is reducing implementation complexity in transmissions over nonlinear dispersive channels. The ST-WMF-MLSD receiver (i) drastically reduces the number of states of the Viterbi decoder (VD) and (ii) offers a smooth trade-off between performance and complexity. In this work the ST-WMF-MLSD receiver is investigated in detail. We show that the space compression of the nonlinear channel is an instrumental property of the ST-WMF-MLSD which results in a major reduction of the implementation complexity in intensity modulation and direct detection (IM/DD) fiber optic systems. Moreover, we assess the performance of ST-WMF-MLSD in IM/DD optical systems with chromatic dispersion (CD) and polarization mode dispersion (PMD). Numerical results for a 10 Gb/s, 700 km, and IM/DD fiber-optic link with 50 ps differential group delay (DGD) show that the number of states of the VD in ST-WMF-MLSD can be reduced ∼4 times compared to an oversampled MLSD. Finally, we analyze the impact of the imperfect channel estimation on the performance of the ST-WMF-MLSD. Our results show that the performance degradation caused by channel estimation inaccuracies is low and similar to that achieved by existing MLSD schemes (∼0.2 dB).

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“…From (24) notice that the computation of the cost function for every candidate symbol sequence { } can be achieved from the samples at the outputs of the matched filters given by (25).…”

Section: Mlsd Receiver For Nonlinear Channels With Awgnmentioning

confidence: 99%

Section: Performance Evaluation In Im/dd Optical Systemsmentioning

confidence: 99%

Section: Impact Of the Imperfect Channel Knowledgementioning

confidence: 99%

See 1 more Smart Citation

Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Maggio

Hueda

Agazzi³

2015

Journal of Electrical and Computer Engineering

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“…As a result, inter-aircraft optical wireless communication (IaOWC) technology has been developed. OWC technology requires clear line-of-sight (LOS) between the transmitter and the receiver [2]. Due to the high probability of blocking the LOS due to the presence of clouds, it is desired to have multiple redundant information transmission pathways for a reliable information transmission system.…”

Section: Introductionmentioning

confidence: 99%

Simulative Analysis of an Inter-aircraft Optical Wireless Communication System Using Amplifier

Singh¹

2017

Journal of Optical Communications

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In this paper, the simulative analysis of an interaircraft optical wireless communication (IaOWC) system has been presented using different system parameters and the performance of the system has been enhanced by the application of EDFA amplifier at the receiver end. A link range of 110 km at 2.5 Gbps has been achieved with same BER performance resulting in the performance enhancement of 47 % when compared to previous detection mechanism.

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“…8,9 But they cannot fully compensate the distortions because the absolute square-law detection of the photodiode (PD) is the fundamental reason why the performance of conventional linear equalizer is degraded. A nonlinear equalizer is used to further enhance the system performance, such as a mathematical square root operator (SQRT), 10 nonlinear FFE-DFE (NL-FFE-DFE), 11 and maximum-likelihood sequence estimation (MLSE). 12,13 SQRT can linearize the receiver before equalization, but this cannot change the fact that the phase information introduced by dispersion is lost even after the square root operation.…”

Section: Introductionmentioning

confidence: 99%

Iterative intersymbol interference cancellation in vestigial sideband Nyquist–subcarrier modulation system

Liu

Chen

et al. 2014

Opt. Eng

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Abstract. The intersymbol interference caused by dispersion, chirp, and a vestigial sideband filter in intensity modulation and a direct detection single carrier system is analyzed theoretically and numerically. An iterative nonlinear intersymbol interference cancellation technique is proposed and experimentally demonstrated in a 40-Gbps 16-QAM Mach-Zehnder modulator-based vestigial sideband intensity modulation and direct detection halfcycle Nyquist-subcarrier modulation system over a 100-km uncompensated standard single-mode fiber transmission for the first time. The experimental results show that 2.2-dB receiver sensitivity improvement is obtained at the forward error correction limit by using the iterative technique.

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Square root strategy: a novel method to linearize an optical communication system with electronic equalizers

Cited by 30 publications

References 0 publications

Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Simulative Analysis of an Inter-aircraft Optical Wireless Communication System Using Amplifier

Iterative intersymbol interference cancellation in vestigial sideband Nyquist–subcarrier modulation system

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