Optical CDMA Spectral-Amplitude Codecs Capable of Reducing Multiple-Access and Optical Beat Interferences(Transmission Systems and Transmission Equipment for Communications)
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概要
- 論文の詳細を見る
Spectral-amplitude coding (SAC) techniques in fiber-Bragg-grating (FBG)-based optical code-division multiple-access (OCDMA) systems were investigated in our previous work. This paper adopts the same network architecture to investigate the simultaneous reductions of multiple-access interference (MAI) and optical beat interference (OBI). The MAI is caused by overlapping wavelengths from undesired network coder/decoders (codecs) while the OBI is induced by interaction of simultaneous chips at adjacent gratings. It is proposed that MAI and OBI reductions may be obtained by use of : 1) a source spectrum that is divided into equal chip spacing ; 2) coded FBGs characterized by approximately the same number of "0" and "1" code elements ; and 3) spectrally balanced photo-detectors. With quasi-orthogonal Walsh-Hadamard coded FBGs, complementary spectral chips is employed as signal pairs to be recombined and detected in balanced photo-detectors, thus achieving simultaneous suppression of both MAIs and OBIs. Simulation results showed that the proposed OCDMA spectral-amplitude coding scheme achieves significant MAI and OBI reductions.
- 社団法人電子情報通信学会の論文
- 2004-11-01
著者
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Huang Jen-fa
The Institute Of Computer And Communication Department Of Electrical Engineering National Cheng Kung
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Lin Song-ming
The Institute Of Computer And Communication Department Of Electrical Engineering National Cheng Kung
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CHANG Yao-Tang
the Institute of Computer and Communication, Department of Electrical Engineering, National Cheng Ku
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Chang Yao-tang
The Institute Of Computer And Communication Department Of Electrical Engineering National Cheng Kung