Impact of fiber chromatic dispersion on the BER performance of an optical CDMA IM/DD transmission system

Majumder, S. P.; Azhari, Afreen; Abbou, F. M.

doi:10.1109/lpt.2005.846924

Cited by 49 publications

(30 citation statements)

References 7 publications

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“…The first term in (11) is the offset effect, removed by using balanced decoder. The second and third term in (11) are the in phase autocorrelation peak and multiple access interference (MAI), respectively.…”

Section: Receiver Modelmentioning

confidence: 99%

“…The performance of an asynchronous phase encoded OCDMA system considering fiber chromatic dispersion has been reported in [9] in the case of standard single mode and dispersion shifted optical fiber. The impact of fiber chromatic dispersion on direct sequence OCDMA (DS-OCDMA) system with intensity modulation and direct detection (IM/DD), sequence inversion keyed (SIK) receiver [10] O-CDMA system is recently reported in [11]. The performance of a two dimensional wavelength hopping time spreading optical CDMA system with bipolar codes has been described in [12] without considering the effect of fiber chromatic dispersion.…”

Section: Introductionmentioning

confidence: 99%

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The impact of fiber chromatic dispersion of a wavelength hopping time spreading optical CDMA system

Majumder

Azhari²,

Haider³

2006

SPIE Proceedings

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A theoretical analysis is presented to evaluate the impact of fiber chromatic dispersion on the bit error rate (BER) performance of a two dimensional wavelength hopping time spreading optical CDMA system. A bipolar-unipolar coding scheme has been considered for 7 chip m-sequence and 31 and 127 chip Gold sequence considering a standard single mode fiber. The numerical results show that there is an order of magnitude increase in BER due to the effect of dispersion. For 100 simultaneous users, at a received power of -4dbm, average BER occurs at about 10 -6 and 10 -12 with and without chromatic dispersion respectively for 7-chip m-sequence at a chip rate of 10 Gchip/sec for a fiber length of 245.05 km, with dispersion coefficient of 16 ps/km-nm. For 31-chip Gold sequence, the corresponding average BER is of the order of 10 -17 and 10 -21 with and without dispersion respectively. It is further noticed that for 10 simultaneous users, the system operating at a chip rate of 10Gchip/sec, suffers a power penalty of 9.15 dB for 7-chip m-sequence and 1dB for 31-chip Gold sequence at a BER of 10 -9 .

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Section: Receiver Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The impact of fiber chromatic dispersion of a wavelength hopping time spreading optical CDMA system

Majumder

Azhari²,

Haider³

2006

SPIE Proceedings

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“…Os códigos OOC são largamente empregados em função de seus valores de autocorrelação e correlação cruzada (ZHANG; JI; CHEN, 1999) (KITAYAMA; WADA; SOTOBAYASHI, 2000) e (DJORDJEVIC et al, 2004). Neste tipo de codificação, os bits transmitidos são modulados por OOC no domínio do tempo, assim para cada bit "1" que é transmitido um código OOC é enviado e quando o bit "0" é transmitido nenhum código é enviado ou envia-se a forma complementar do código OOC (MAJUMDER; AZHARI; ABBOU, 2005). Neste trabalho, os códigos OOC são empregados para formar em conjunto com os comprimentos de onda os caminhos ópticos virtuais que serão roteados e encaminhados na rede.…”

Section: Principio Da Multiplexação óPtica Por Divisão De Código (Ocdm)unclassified

“…Na tecnologia OCDMA cada bit é dividido em n intervalos de tempo denominados chips e uma seqüência de chips forma uma assinatura denominada codeword, onde cada usuário da rede OCDMA possui uma assinatura distinta. Dessa forma, todos os bits "1" a serem transmitidos são codificados no formato da assinatura e os bits "0" não são transmitidos ou transmite-se o complemento da assinatura (MAJUMDER; AZHARI; ABBOU, 2005). O sinal codificado é transmitido para todos os nós da rede e o crosstalk entre os usuários ocorre principalmente pela interferência de acesso múltiplo MAI (MultipleAccess Interference) JI;CHEN, 1999 (BANERJEE et al, 2001).…”

Section: Introductionunclassified

Análise de desempenho de redes ópticas híbridas WDM/OCDM

Durand

Moschim

2005

Semina: Tech. Ex.

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ResumoNeste trabalho apresenta-se uma análise de redes ópticas híbridas multiplexadas em comprimentos de onda e códigos ópticos WDM/OCDM (Wavelength Division Multiplexing/Optical Code-Division Multiplexing). Nesta análise foram apresentadas as vantagens do emprego de caminhos ópticos virtuais compostos por códigos ópticos ortogonais OOC (Orthogonal Optical Codes) e comprimentos de onda para a comutação e roteamento no domínio óptico, bem como a arquitetura de rede utilizada. Como resultados obtidos observou-se que o emprego de códigos OOC juntamente com conversores de códigos ópticos tem um grande impacto na diminuição da probabilidade de bloqueio de estabelecimento de caminhos ópticos virtuais, assim aumenta-se a utilização da rede. Palavras-chave: Redes ópticas. WDM/OCDM. Wavelength Division Multiplexing/Optical Code-Division Multiplexing. OOC. Orthogonal Optical Codes. AbstractIn this work, optical networks using the hybrid technology of wavelength division multiplexing and optical code division multiplexing (WDM/OCDM) are investigated. The architecture of the network is described and it is shown the main advantages of applied optical paths with wavelengths and optical orthogonal codes (OOC) to routing and switching virtual optical paths. The main results show that the use of OOC codes together with optical codes converters have a great impact on the decrease of blocking probability for establishing virtual optical paths, increasing network use.

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“…1-D and 2-D codes, hence should suffer from the impact of timing skew as the time-dimension of the code is large. The impact of fiber dispersion on the code performance of the 2-D codes has been extensively investigated [6,7] and it has been shown that these are prone to the problem of timing skew arising in the fiber if larger time dimensions are used for better BER performance.…”

Section: Introductionmentioning

confidence: 99%

A new family of 3-D optical orthogonal codes for optical CDMA systems with differential detection

Singh¹,

Singh

2009

J Opt Fiber Commun Res

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Two-dimensional codes for OCDMA have been shown to be more versatile compared to the one-dimensional codes for their good spectral efficiency as well as better BER performance. The two-dimensional (2-D) codes also benefit from the reduction of the wavelength/time-like property over the one-dimensional (1-D) codes. The three-dimensional (3-D) codes are important as these produce a larger code set. In this paper, we present a new family of 3-D single pulse per plane codes for differential detection (SPDD) for optical cdma systems (based on the 1-D golomb ruler sequences), which achieve good code cardinality and a very high BER performance. The improved BER performance is obtained by using two codes to encode '1' and '0' bits in the encoder and adopting the Differential Detection in the receiver. The comparison of our 3-D single pulse per plane codes for differential detection with some of the best reported 2-D/3-D codes, shows that the 3-D SPDD codes perform significantly better than the others. The number of simultaneous users supported at 1e-9 is much more increased over those supported by the earlier proposed 2-D/3-D orthogonal codes.

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Impact of fiber chromatic dispersion on the BER performance of an optical CDMA IM/DD transmission system

Cited by 49 publications

References 7 publications

The impact of fiber chromatic dispersion of a wavelength hopping time spreading optical CDMA system

The impact of fiber chromatic dispersion of a wavelength hopping time spreading optical CDMA system

Análise de desempenho de redes ópticas híbridas WDM/OCDM

A new family of 3-D optical orthogonal codes for optical CDMA systems with differential detection

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