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Impact of chromatic dispersion on DPSK and DQPSK direct-detection optical systems

Effet de la dispersion chromatique sur des systèmes optiques à détectiion directe en modulation différentielle par déplacement de phase et déplacement de phase en quadrature

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Abstract

Chromatic dispersion (CD) limitations for binary and quaternary phase-modulated systems using direct detection receivers are analyzed by numerical simulation, comparing the results with intensity-modulated systems, considering both IMDD (Intensity-Modulation Direct-Detection) and Duobinary formats. Three different receiver structures are assumed and many transmitter and receiver filter bandwidths are spanned, to find out how much CD penalty varies depending on such alternative solutions. Penalty was assessed by means of a very accurate performance estimation semi-analytical technique based on Karhunen-Loève series, which theoretically converges to the exact bit-error rate for direct detection optical systems in the presence of both ase noise and inter-symbol interference. The results show that DQPSK is the most resilient format to CD, as expected, but it is also the less sensitive format to filter bandwidth variations.

Résumé

L’article présente une analyse par simulation numérique de limitations dues à la dispersion chromatique dans les systèmes à modulation de phase binaires et quaternaires utilisant des récepteurs à détection directe. Il compare les résultats à ceux des systèmes à modulation d’intensité utilisant la détection directe ou le format duobinaire. Il étudie comment la pénalité due à la dispersion varie selon la structure du récepteur (trois structures différentes sont considérées) et les largeurs de bande des filtres d’émission et de réception (de nombreuses valeurs sont considérées). La pénalité est évaluée au moyen d’une méthode semi-analytique d’estimation très précise de la performance, fondée sur un développement de Karhunen Loeve, qui converge théoriquement vers le taux d’erreur binaire exact dans le cas de systèmes optiques à détection directe en présence à la fois de bruit d’émission spontanée amplifiée et d’interférence intersymbole. La modulation par déplacement différentiel de phase apparaît comme le système le plus résistant à la dispersion chromatique, comme on s’y attendait, mais est aussi le format le moins sensible aux variations des largeurs de bandes des filtres.

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Author notes

  1. Pierluigi Poggiolini & Gabriella Bosco

    Present address: Dipartimento di Elettronica, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy

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    1. Pierluigi Poggiolini
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    2. Gabriella Bosco
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    Poggiolini, P., Bosco, G. Impact of chromatic dispersion on DPSK and DQPSK direct-detection optical systems. Ann. Telecommun. 62, 531–549 (2007). https://doi.org/10.1007/BF03253275

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