Photonic code-division multiple-access communications

Sampson, David D.; Pendock, G.J.; Griffin, Robert

doi:10.1080/01468039708202284

Cited by 89 publications

(44 citation statements)

References 82 publications

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“…However, as in radio spread spectrum, coherent processing based on manipulation of optical fields, which can be made to sum to zero, is needed for good suppression of multiple-access interference. Note that coherent processing is possible even for systems using incoherent noise sources, e.g., coherence multiplexing approaches based on interferometric techniques; however, recent analyzes have shown that optical beat noise becomes a major factor limiting the capacity of such systems [14]. Here, we experimentally investigate an ultrashort pulse optical CDMA scheme based on spectral phase encoding and decoding of coherent modelocked pulses [7], [15].…”

Section: Introductionmentioning

confidence: 99%

“…Two reviews of optical CDMA are given in [14] and [15]. Optical CDMA schemes may be classified according to the choice of coherent versus incoherent processing, coherent (modelocked pulses) versus incoherent (e.g., amplified spontaneous emission) broadband optical source, and encoding method (time-domain versus frequency-domain, amplitude versus phase).…”

Section: Introductionmentioning

confidence: 99%

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A femtosecond code-division multiple-access communication system test bed

Sardesai

Chang

Weiner

1998

J. Lightwave Technol.

160

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Abstract-This paper reports comprehensive experimental results on a femtosecond code-division multiple-access (CDMA) communication system test bed operating over optical fiber in the 1.5 m communication band. Our test bed integrates together several novel subsystems, including low-loss fiber-pigtailed pulse shapers for encoding-decoding, use of dispersion equalizing fibers in dispersion compensated links for femtosecond pulse transmission and also in femtosecond chirped pulse amplification (CPA) erbium doped fiber amplifiers (EDFA's), and high-contrast nonlinear fiber-optic thresholders. The individual subsystems are described, and single-user system level experimental results demonstrating the ability to transmit spectrally encoded femtosecond pulses over a 2.5-km dispersion compensated fiber link followed by decoding and high contrast nonlinear thresholding are presented.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A femtosecond code-division multiple-access communication system test bed

Sardesai

Chang

Weiner

1998

J. Lightwave Technol.

160

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“…0 processo de deteccao pode ser aprimorado atraves de uma porta de transmissao que e aberta, apenas, naqueles interva los de chip ativos da sequencia de origem, codificada para cada bit e, assirn, os sinais incidentes fora dos intervalos de transmissao serao rejeitados. Logo, a porta de transrnissao temporizada se comporta de forma analogs a um filtro passa faixa sobre 0 sinal espalhado espectralmente [1].…”

Section: Porta De Transmissao Temporizaoaunclassified

Códigos Unipolares para Aplicações em CDMA Óptico

Panaro¹,

Almeida²

2000

Journal of Communication and Information Systems

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Resumo -Diversos esquemas de multiple acesso atraves de divisao por codigo tern sido propostos para sistemas fotoni cos. Em particular, para as aplicacoes que utilizam 0 princi pio da superposicao nao-coerente dos campos opticos, os tra balhos concentram-se na construcao de codigos especfficos e na obtencao da probabilidade de erro resultante da acao do rufdo e/ou interferencia presentes no canal. De modo dis tinto, neste artigo desenvolve-se. inicialmente, uma base teo rica para a analise de desempenho que contempla a deteccao de sinais unipolares, submetidos a condicoes de interferen cia aditiva e estritamente positiva, admitindo 0 uso tanto de sinalizacao podal quanto ortogonal. Alem disso, analisa-se 0 desempenho de sistemas CDMA unipolares sob a perspectiva de deteccao convencional e, tambem, para receptores que uti lizem a tecnica de limitacao abrupta. Finalrnente, propoe-se uma nova classe de codigos de espalhamento temporal que alem de possibilitar uma grande diversidade de sequencias, tern 0 potencial de fornecer urn desempenho superior, em ter mos de taxa de erro, quando comparados a outros codigos propostos anteriormente.Abstract -Several code-division multiple access schemes have been proposed for photonic systems. Specifically, for such applications using the non-coherent optical fields superposition principle, most works are focused on the construction of specific codes and its error performance analysis, due the action of the channel noise and/or interference.In opposition, this paper establishes first a theoretical basis on the performance analysis of the unipolar signal detection under additive and strictly positive interference, taking in account either podal or orthogonal signaling. Furthermore, the performance of unipolar CDMA systems is investigated under the perspective of standard detection, or hard limiting techniques. Finally. a new class of time-hopping codes is proposed, which allows large sequence diversity. It has potential to achieve better error performance, when compared to the codes investigated earlier. Palavras-chave:Spread-spectrum, CDMA optico, sinaliza <;;ao unipolar podal, sinalizacao unipolar ortogonal, deteccao de sinais unipolares, codigos OOC, codigos OTH. *Este trabalho foi financiado parcial mente pelo Conselho Nacional deDesenvolvimento Cientffico e Tecnologico -CNPq INTRODUCAODiversas tecnicas de CDMA para cornunicacoes opticas foram propostas nas ultimas duas decadas, Durante esse periodo varies enfoques foram abordados, diversas analises de desempenho foram desenvolvidas e, tambem, uma serie de experimentos para a comprovacao dos conceitos foram rea lizados. No entanto, apesar do grande sucesso do CDMA como uma ferrarnenta de comunicacao em aplicacoes via ra dio, existem, ainda, poucas aplicacoes comerciais dessa tee nica em sistemas fot6nicos.o CDMA e uma tecnica que oferece a possibilidade de rruiltiplo acesso atraves da utilizacao de sequencias de espal hamento distintas para cada usuario, A codificacao permite que os usuaries compartilhem a mesma banda de freq...

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“…Incoherent time-spreading 1-D OCDMA has drawn wide attention due to its simple implementation. Nevertheless, incoherent OCDMA systems exhibit drawbacks such as limited code size, low bandwidth efficiency, and relatively poor auto-and crosscorrelation characteristics [3][4][5]. The relatively poor characteristics of the incoherent 1-D OCDMA networks can be improved in 2-D incoherent OCDMA systems in which the coding operation is performed both in temporal and spectral domains [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

Chung

2016

Journal of the Optical Society of Korea

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A two-dimensional optical code division multiple access (OCDMA) en/decoder composed of four double-ring resonator add/drop filters and three delay waveguides is designed, and a transfer matrix method combined with fast Fourier transform is implemented to provide numerical simulations for the en/decoder. The auto-correlation peak level over the maximum cross-correlation level is larger than 3 at the center of the correctly decoded pulse for most of wavelength hopping and spectral phase code combinations, which assures the BER lower than 10 -3 which corresponds to the forward error correction limit.

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Photonic code-division multiple-access communications

Cited by 89 publications

References 82 publications

A femtosecond code-division multiple-access communication system test bed

A femtosecond code-division multiple-access communication system test bed

Códigos Unipolares para Aplicações em CDMA Óptico

Design and Simulation of Two-Dimensional OCDMA En/Decoder Composed of Double Ring Add/Drop Filters and Delay Waveguides

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