Optical DPSK heterodyne detection experiments using DBR laser diodes with external optical feedback

Emura, K.; Shikada, M.; Yamazaki, S.; Komatsu, K.; Mito, I.; Minemura, K.

doi:10.1049/el:19850794

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Suppose that at the receiver the incoming DPSK signal is impaired by in-band crosstalk due to DPSK interferers, originated from different sources with the same bit rate and nominal wavelength as the desired signal. Therefore, the total electrical field at the interferometer input can be given by (1) where the first term corresponds to the desired signal, the second term to the in-band crosstalk, and the third term to the ASE noise originated from the optical pre-amplifier. The complex envelope of the signal field during the interval can be represented as (2) where denotes convolution, the average signal power incident at the amplifier input, a rectangular pulse of unitary amplitude within the interval and zero elsewhere, the polarization unit vector, and the signal phase.…”

Section: Decision Variable Modeling Andmentioning

confidence: 99%

“…This scheme entered in the optical arena in the late 1980s, in the context of a research effort that took place at that time in order to use coherent detection techniques as a way to improve receiver sensitivity and hence transmission distance [1], [2]. However, the advent of erbium-doped fiber amplifiers refocused the interest on direct-detection techniques and, as a consequence, the possibility of using a Mach-Zehnder delay interferometer in conjunction with a dual-photodiode balanced receiver, to demodulate optical DPSK signals, started to attract attention [3]- [5].…”

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confidence: 99%

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Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Pires

Cancela

2010

J. Lightwave Technol.

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Abstract-In-band crosstalk, due to multiple interferers, has been identified as one of the most severe impairments in optical transparent networks, especially in the ones with a large number of nodes and a high wavelength density. Due to its robustness to in-band crosstalk differential phase-shift keying (DPSK) emerges as an attractive modulation scheme to be used in such environments. This paper proposes a rigorous formulation to estimate the performance of direct-detection DPSK receivers using an eigenfunction expansion technique in the time domain. The method takes into account both the in-band crosstalk, due to an arbitrary number of interfering terms, and the amplified spontaneous emission noise and is able to deal with any combination of optical and electrical filter shapes. Using this method the accuracy of an approximation based on the wideband optical filtering assumption was evaluated and shown that the approximation, although not providing reliable results for the error probabilities, can be used with confidence to compute power penalties due to in-band crosstalk. Furthermore, the crosstalk tolerance of DPSK over on-off keying was quantified and shown that this tolerance is reduced when the number of interferers increases.Index Terms-Differential phase-shift keying, eigenvalues and eigenfunctions, in-band crosstalk, optical networking.

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Section: Decision Variable Modeling Andmentioning

confidence: 99%

mentioning

confidence: 99%

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Pires

Cancela

2010

J. Lightwave Technol.

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“…It was also possible to compare the simulated pulse shapes with those found experimentally, and hence identify which parameters were causing degradations in the experimental system. (1) = sin(4wt +O(t)) (2) where 4w is the difference frequency between the LO and signal carrier.…”

Section: Dpsk/psk Demodulationmentioning

confidence: 99%

Investigation Of Coherent Optical Communications Systems With DPSK And PSK Modulation And The Use Of A Travelling Wave Laser Amplifier In A PSK Transmission Experiment

Steele

Marshal

1987

SPIE Proceedings

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A computer simulation several parameters that reveal that, in practice, detection sensitivity than measurements. ABSTRACT of DPSK and PSK transmission systems has highlighted critically affect system performance. The simulationsPSK systems can be made to operate closer to their ideal DPSK systems. These findings are supported by experimental A PSK system was assembled using a travelling wave laser amplifier repeater, the addition of which caused no significant degradation of receiver sensitivity. The experiment confirms the suitability of laser amplifiers for coherent systems.

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“…Theoretische Untersuchungen ergaben, daß die Linienbreite kleiner 10" 2 der übertragenen Bandbreite sein muß [37]. Für Linienbreiten in dieser Größenordnung müssen an allen Halbleiterlasertypen zusätzliche Maßnahmen ergriffen werden [13]. Für Linienbreiten in dieser Größenordnung müssen an allen Halbleiterlasertypen zusätzliche Maßnahmen ergriffen werden [13].…”

Section: Laserunclassified

“…Bei ASK-Modulation wird die ZF einbzw. Beim Heterodyn-Empfang besteht darüber hinaus die Möglichkeit, DPSK (differential phase shift keying)-Verfahren zu verwenden [13]. "Null".…”

Section: / Heterodyn-empfängerunclassified

Optischer Überlagerungsempfang – eine Übersicht

Strobel¹,

Schmuck²

1987

Frequenz

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Übersicht:Der optische Überlagerungsempfang erlaubt, im Gegensatz zum konventionellen Direktempfang, eine grundsätzlich neue Art der optischen Nachrichtenübertragung. Durch Ausnutzen bisher wenig beachteter Kohärenzeigenschaften der verwendeten Lichtquellen ist es theoretisch möglich, die Empfängerempfmdlichkeit einer optischen Übertragungsstrecke um nahezu einen Faktor 1000 zu erhöhen, wodurch eine erhebliche Steigerung der verstärkerfreien Faserstrecke erreicht werden kann. Zusätzlich kann man analog zum Überlagerungsempfang in der Rundfunktechnik über eine Vielzahl von benachbarten Kanälen gleichzeitig übertragen. Damit ergibt sich die Möglichkeit, eine substantielle Erhöhung der Übertragungskapazität in zukünftigen optischen Übertragungssystemen zu erzielen.Abstract: In contrast to conventional optical direct receivers, coherent optical receivers enable a basically novel scheme for optical transmission techniques. By evaluating until now almost neglected coherence properties of light sources, it is possible to increase the receiver sensitivity of an optical transmission link up to a factor of 1000, which enables a drastic increase of the repeater spacing. Furthermore, it is possible to introduce coherent frequency division multiplexing similar to the well-known broadcasting techniques. This allows a substantial improvement of the transmission capacity in future optical transmission systems. Für die Dokumentation: Optische Nachrichtentechnik / Kohärente Übertragung / Halbleiterlaser / Polarisation / Modulationstechnik / Integrierte Optik 1. Einleitung Mit der Entwicklung des Lasers Anfang der 60er Jahre stand eine Lichtquelle zur Verfügung, die gegenüber den bisherigen thermischen Strahlern völlig neue Einsatzmöglichkeiten schuf. Parallel dazu wurde es möglich, mit Hilfe der Glasfasertechnik elektromagnetische Wellen im nahen Infrarot mit niedriger Dämpfung zu übertragen. Die Entwicklung von Halbleiterlaserdioden als Sender und die bereits vorhandenen Empfängerdioden als Detektoren ermöglichten eine kompakte Bauweise der elektro-optischen Schnittstellen. Damit wurde der praktische Einsatz von optischen Übertragungssystemen ermöglicht. Dabei waren zunächst nur die Amplitudeneigenschaften dieser Systeme relevant. Die Datenübermittlung -sowohl digital als auch analog-erfolgt im allgemeinen dadurch, daß die Laserausgangsleistung moduliert wird. Empfängerseitig wird mit Hilfe eines rein intensitätssensitiven Detektors eine Erkennung des Datenstroms vorgenommen. Kohärente Systeme nutzen im Gegensatz dazu die Tatsache, daß elektromagnetische Wellen außer Amplituden-auch Frequenz-bzw. Phaseneigenschaften [l, 2] aufweisen.

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Optical DPSK heterodyne detection experiments using DBR laser diodes with external optical feedback

Cited by 10 publications

References 2 publications

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Estimating the Performance of Direct-Detection DPSK in Optical Networking Environments Using Eigenfunction Expansion Techniques

Investigation Of Coherent Optical Communications Systems With DPSK And PSK Modulation And The Use Of A Travelling Wave Laser Amplifier In A PSK Transmission Experiment

Optischer Überlagerungsempfang – eine Übersicht

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