Modelling of intersymbol interference effect on signal to noise ratio measurement in long haul optical amplifier systems

Takahashi, Tetsuo; Aoyama, M.; Murakami, Makoto; Amemiya, M.

doi:10.1049/el:19951469

Cited by 10 publications

(2 citation statements)

References 4 publications

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“…No entanto, na presen<;a de distor<;ao da forma dos impulsos ou interferencia entre sfmbolos, 0 factor Q e a BER nao tem uma rela<;ao directa, analftica e exacta entre si. Como estes efeitos alargam a variancia estimada, as parametros ).11 e ).10 devem ser tratados como variaveis aleatorias, em vez de valores constantes [16][17][18].…”

Section: Estimativa Da Berunclassified

Monitorização Óptica do Desempenho em Sistemas de Comunicações Baseada em Histogramas de Amplitude Assincronamente Amostrados

André¹,

Teixeira²,

Lima³

et al. 2003

Journal of Communication and Information Systems

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Resumo-A estimativa do desempenho dos sistemas de comunica«6es 6pticas e urn aspecto fundamental no desen volvimento das futuras redes completamente 6pticas. No ambito deste trabalho pretendeu-se desenvol ver tecnicas que permitam estimar 0 desempenho de urn sinal 6ptico multiplexado no comprimento de onda, distorcido pela dis persao cromatica, rufdo de emissao espontanea dos ampli ficadores e efeitos nao lineares. utilizando histogramas de amplitude assincronamente amostrados. Foi verificado experimental mente urn modelo numerico desenvolvido para estimar 0 factor Q a partir de histogramas assfncronos em func;ao da rela«ao sinal / rufdo. tempo de subida e formato dos impulsos. Tambem propomos urn modelo para aceder directamente a BER de urn sinal DWDM a partir de his togramas assincronamente amostrados. Os resultados expe rimentais obtidos indicam que este metodo pode monito rizar a degradac;ao do sinal 6ptico, confirmando a aplica bilidade desta tecnica para monitoriza«ao 6ptica do desem penho para redes fot6nicas transparentes. Palavras-chave: Multiplexagem no comprimento de onda, monitoriza«ao 6ptica do desempenho, amostragem assfn crona, prote«ao de redes, qualidade de servi«o.

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Section: Estimativa Da Berunclassified

Monitorização Óptica do Desempenho em Sistemas de Comunicações Baseada em Histogramas de Amplitude Assincronamente Amostrados

André¹,

Teixeira²,

Lima³

et al. 2003

Journal of Communication and Information Systems

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“…In order to efficiently operate, manage and maintain optical networks, cost-effective optical signal quality monitoring techniques are highly desired [7][8][9]. Several optical channel monitoring schemes have been reported [9][10][11][12][13][14][15][16][17]. Most of these techniques are focused on monitoring a single performance parameter, such as optical signal to noise ratio (OSNR) [17][18][19], or chromatic dispersion [20][21][22][23], or channel crosstalk [24][25].…”

Section: Background and Motivationmentioning

confidence: 99%

Channel monitoring for optical WDM networks

Ye¹

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As in any other transmission systems, signals transported in optical WDM networks suffer from various kinds of distortions and impairments. Optical amplifiers give rise to amplified spontaneous emission (ASE) noise. Network components such as optical cross-connects (OXCs) and optical add-drop multiplexers (OADM) introduce both interband and intraband crosstalk. Different kinds of dispersion including chromatic dispersion, polarization mode dispersion (PDM) are limiting factors in today's longhaul transmission networks. In addition, fiber nonlinearities including self-phase modulation (SPM), cross-phase modulation (XPM) and four wave mixing (FWM) are harmful to the desired optical signals, since the signal transmission power is highly increased in today's high-speed optical transmission networks. In order to efficiently operate, manage and maintain optical networks, efficient optical monitoring techniques are highly desired. Bit error rate (BER) is a fundamental performance parameter for digital transmission systems. The conventional method uses error codes that are appended to the data frame to facilitate the measurement of BER. However, this method requires prior knowledge of the bit rate and coding format of the signal and it is not suitable for transparent optical networks because transparent optical network is capable to carry arbitrary data rates and protocols simultaneously. One promising solution for BER estimation in optical networks is to make use of optical signal's amplitude histograms.

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