Optical CDMA spectral-amplitude codecs capable of reducing multiple-access and optical beat interferences

Jen-Fa Huan, Yao Tang Chang, Song Ming Lin

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)3195-3202
Number of pages8
JournalIEICE Transactions on Communications
VolumeE87-B
Issue number11
Publication statusPublished - 2004

Fingerprint

Light interference
Multiple access interference
Code division multiple access
Detectors
Fiber Bragg gratings
Network architecture
Wavelength

All Science Journal Classification (ASJC) codes

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

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abstract = "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.",
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Optical CDMA spectral-amplitude codecs capable of reducing multiple-access and optical beat interferences. / Huan, Jen-Fa; Chang, Yao Tang; Lin, Song Ming.

In: IEICE Transactions on Communications, Vol. E87-B, No. 11, 2004, p. 3195-3202.

Research output: Contribution to journalArticle

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