Modulation formats for 100G and beyond

Lach, E.; Idler, W.

doi:10.1016/j.yofte.2011.07.012

Cited by 119 publications

(44 citation statements)

References 82 publications

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“…The signáis were separated then by a demultiplexer, and detected by the PM-DQPSK receivers. It should be indicated here that the PM-DQPSK receivers used in the simulation were incoherent receivers based on four delay interferometers [19]. Finally, the detected signáis were analyzed by bit error rate (BER) analyzers.…”

Section: Simulations Setup and Analysis Methodsmentioning

confidence: 99%

Signal penalties induced by different types of optical filters in 100Gbps PM-DQPSK based optical networks

Pereda

Horche

2016

Optical Switching and Networking

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Keywords:Optical filter Optical crosstalk Signal impairment Optical communication Polarization multiplexed differential quadrature phase shift keying (PM-DQPSK) Optical filters are crucial elements in optical communication networks. However, they seriously affect the signal quality, especially in the concatenation condition. In this paper, we study and simúlate the signal penalties induced by five types of filters, including Butterworth, Gaussian, Bessel, Fiber Bragg Grating (FBG) and Fabry-Perot (F-P) filters, in order to optimize the optical network performance. Signal penalties, including both filter concatenation effect and filter induced in-band and out-band crosstalk, are analyzed by eye opening penalty (EOP) and Q-penalty. Simulation results show that the Butterworth filter performs best among these four types of filters. Total Q-penalty induced by a Butterworth filter-based demultiplexer/multiplexer pair, considering both filter concatenation effect and crosstalk, is lower than 0.5 dB, when the filter bandwidth is in the range of 42-46 GHz. Simulations done in a 100 Gbps PM-DQPSK optical network indícate that the permitted cascaded number is 14 and 10 with respect to the case of filters aligned and misaligned, respectively. Penalties induced by láser frequency shift are investigated and the performance of the 3rd-order Butterworth filter is compared to the 4th-order superGaussian filter. Finally, discussions of optical filter performances, including insertion loss, reconfigurability and programmability, are presented.

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Section: Simulations Setup and Analysis Methodsmentioning

confidence: 99%

Signal penalties induced by different types of optical filters in 100Gbps PM-DQPSK based optical networks

Pereda

Horche

2016

Optical Switching and Networking

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“…Each network node can be equipped with ROADMs to route wavelength connections optically, a set of transponders with bit rates ranging from 10 Gb/s to 100 Gb/s [9]. Spectral efficiency is achieved with optical coherent technology for line rates higher than 40 Gb/s.…”

Section: Network Planning Strategymentioning

confidence: 99%

“…After the signals are obtained by the detector, they are converted to digital format by the A/D converter. Then, the Digital Signal Processing module (DSP) performs a series of operations to recover the transmitted data [9].…”

Section: Coherent Systemsmentioning

confidence: 99%

A Multilayer Approach for Optical Network Planning

Coutinho

Lima

et al. 2016

J. Microw. Optoelectron. Electromagn. Appl.

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Abstract-With the increase in demand to Backbone networks, one became fundamental the application of new telecommunication technologies for efficient use of devices and optical links, such as xPSK modulations with dual polarization, dispersion compensating fibers, coherent detection and digital processing signals. Thus, network planning using analytical models have been proposed in the last years for this purpose. In this paper we propose the use of numerical simulations in wavelength-division multiplexing networks planning via a novel iterative method with highperformance processing, which does an analysis of the quality of transmission in transparent networks.

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“…Optical transport technologies optimized for such network applications with direct detection (DD) techniques gain an increasing number of supporters due to the adaptivity and low complexity offered by optical and electronic transmission technologies used to compensate for linear and nonlinear impairments [4]. Chromatic dispersion (CD) is the prevailing linear impairment that causes intersymbol interference (ISI) [2].…”

Section: Introductionmentioning

confidence: 99%

High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers

et al. 2017

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Optical transmission technologies optimized for optical network segments sensitive to power consumption and cost, comprise modulation formats with direct detection technologies. Specifically, non-return to zero differential quaternary phase shift keying (NRZ-DQPSK) in deployed fiber plants, combined with high-performance, low-complexity electronic equalizers to compensate residual impairments at the receiver end, can be proved as a viable solution for high-performance, high-capacity optical links. Joint processing of the constructive and the destructive signals at the single-ended DQPSK receiver provides improved performance compared to the balanced configuration, however, at the expense of higher hardware requirements, a fact that may not be neglected especially in the case of high-speed optical links. To overcome this bottleneck, the use of partially joint constructive/destructive DQPSK equalization is investigated in this paper. Symbol-by-symbol equalization is performed by means of Volterra decision feedback-type equalizers, driven by a reduced subset of signals selected from the constructive and the destructive ports of the optical detectors. The proposed approach offers a low-complexity alternative for electronic equalization, without sacrificing much of the performance compared to the fully-deployed counterpart. The efficiency of the proposed equalizers is demonstrated by means of computer simulation in a typical optical transmission scenario.

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Modulation formats for 100G and beyond

Cited by 119 publications

References 82 publications

Signal penalties induced by different types of optical filters in 100Gbps PM-DQPSK based optical networks

Signal penalties induced by different types of optical filters in 100Gbps PM-DQPSK based optical networks

A Multilayer Approach for Optical Network Planning

High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers

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