Simultaneous Demodulation and Clock-Recovery of 40-Gb/s NRZ-DPSK Signals Using a Multiwavelength Gaussian Filter

Contestabile, G.; Proietti, Roberto; Calabretta, Nicola; Presi, M.; D’Errico, A.; Ciaramella, E.

doi:10.1109/lpt.2008.921115

Cited by 22 publications

(7 citation statements)

References 8 publications

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“…The ideal receiver is studied only for comparison purposes since the ideal optical filter is very harsh to build due to current technological constraints. Regarding the Gaussian receiver, we note that the Gaussian optical filter is a good model to describe real optical filter shapes [14] and it is well known that the frequency responses of the typical Bessel electrical filters and Gaussian filters are very close, especially for higher Bessel filter orders, so this receiver configuration is realistic. Besides this, with these filter shapes a closed-form expression for Λ(τ 1 ,τ 2 ) can be obtained.…”

Section: Dpsk Receiver Configurationmentioning

confidence: 99%

On the Behaviour of Eigenfunctions and Eigenvalues in the Performance Analysis of Optical DPSK Receivers with Optical Amplification

Cancela

Pires

2013

J. Opt. Commun.

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The behaviour of the eigenfunctions and eigenvalues, that are used to describe the eigenfunction expansion of the receiver decision variable of an optical direct detection differential phase-shift keying (DPSK) system with optical amplification, is analysed for various receiver configurations, and their impact on system performance is investigated. In particular, special attention is given to the ideal receiver, based on an ideal optical filter and an electrical integrate-and-dump filter, to the Gaussian receiver, based on Gaussian shaped filters for both the optical and electrical filters, and to a receiver configuration based on a Lorentzian optical filter and an electrical RC filter.

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Section: Dpsk Receiver Configurationmentioning

confidence: 99%

On the Behaviour of Eigenfunctions and Eigenvalues in the Performance Analysis of Optical DPSK Receivers with Optical Amplification

Cancela

Pires

2013

J. Opt. Commun.

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“…Fortunately, various optical clock recovery methods have been developed, including the use of phase-locked loops, self-pulsating lasers, and filtering methods [70]. Optical clock recovery from DPSK signals has also been studied [71][72][73][74]. In particular, recent promising demonstrations have shown the successful synchronization and subclock recovery for ultra-high-speed OTDM signals up to 640 Gbit/s in platforms such as filter-assisted cross-phase modulation (XPM) in a semiconductor optical amplifier (SOA) [75,76], sum-frequency generation (SFG) in a PPLN waveguide [77][78][79][80][81], and XPM in an HNLF [82][83][84].…”

Section: Data Exchange Between Two Orthogonal Polarizations Using Kermentioning

confidence: 99%

Review of Robust Data Exchange Using Optical Nonlinearities

Wang

Willner

2012

International Journal of Optics

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Data exchange, namely bidirectional information swapping, provides enhanced flexibility compared to the unidirectional information transfer. To fulfill the rapid development of high-speed large-capacity optical communications with emerging multiplexing/demultiplexing techniques and advanced modulation formats, a laudable goal would be to achieve data exchange in different degrees of freedom (wavelength, time, polarization), for different modulation formats (OOK, DPSK, DQPSK, pol-muxed), and at different granularities (entire data, groups of bits, tributary channels). Optical nonlinearities are potentially suitable candidates to enable data exchange in the wavelength, time, and polarization domains. In this paper, we will review our recent works towards robust data exchange by exploiting miscellaneous optical nonlinearities, including the use of cSFG/DFG in a PPLN waveguide for time- (groups of bits) and channel-selective data exchange and tributary channel exchange between two WDM+OTDM signals, nondegenerate FWM in an HNLF for phase-transparent data exchange (DPSK, DQPSK), bidirectional degenerate FWM in an HNLF for multi-channel data exchange, and Kerr-induced nonlinear polarization rotation in an HNLF for tributary channel exchange of a pol-muxed DPSK OTDM signal. The demonstrated data exchanges in different degrees of freedom, for different modulation formats, and at different granularities, open the door for alternative approaches to achieve superior network performance.

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“…As a result, it is important to consider in the analyses realistic filter shapes such as that of a Gaussian shape. Actually, a Gaussian optical filter is a good model to describe real optical filter shapes [17] and it is well known that the frequency responses of the typical Bessel electrical filters and Gaussian filters are very close, especially for higher filter orders. The combination of a Gaussian shaped optical filter with an electrical filter with the same shape, denoted here as Gaussian receiver, will be used widely in this paper.…”

Section: Receiver Configuration and Eigenfunction Expansionmentioning

confidence: 99%

Theoretical Insights Into the Impact of Coherent and Incoherent Crosstalk on Optical DPSK Signals

Pires¹,

Cancela²

2010

J. Lightwave Technol.

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Abstract-This paper provides new theoretical insights into the properties of direct detection differential phase-shift keying (DPSK) signals impaired by coherent and incoherent crosstalk. Coherent crosstalk is due to multiple replicas originated while a data signal is routed through an optical network, whereas the source of incoherent crosstalk resides on the interference from other DPSK signals. A special emphasize has been put on modeling the multipath coherent crosstalk, with analytical expressions being derived and presented for both the moment generating function of the decision variable and the average error probability. A rigorous analysis, capable of dealing with arbitrary filtering, is also presented, which is used afterwards to assess the accuracy of the analytical formulas. A detailed comparison with incoherent crosstalk is also performed. Using also an exact treatment for this type of crosstalk it is shown that for low OSNR penalties the coherent crosstalk leads, in some circumstances, to slightly worse results than the incoherent one, but this situation is reversed when the total crosstalk level and the number of interferers increase.Index Terms-Coherent crosstalk, differential phase-shift keying (DPSK), error analysis, incoherent crosstalk, optical networks.

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Simultaneous Demodulation and Clock-Recovery of 40-Gb/s NRZ-DPSK Signals Using a Multiwavelength Gaussian Filter

Cited by 22 publications

References 8 publications

On the Behaviour of Eigenfunctions and Eigenvalues in the Performance Analysis of Optical DPSK Receivers with Optical Amplification

On the Behaviour of Eigenfunctions and Eigenvalues in the Performance Analysis of Optical DPSK Receivers with Optical Amplification

Review of Robust Data Exchange Using Optical Nonlinearities

Theoretical Insights Into the Impact of Coherent and Incoherent Crosstalk on Optical DPSK Signals

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