Optical CDMA network codecs with merged-M-coded wavelength-hopping and prime-coded time-spreading

This paper proposes a new hybrid code for optical CDMA systems based on modified maximal-length sequence (M-sequence) codes for wavelength-hopping and prime codes for time spreading. Using the proposed hybrid code, two optical encoder/decoders are constructed using either fiber-Bragg gratings (FBGs)...

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Bibliographic Details
Published in:Optical fiber technology 2007-04, Vol.13 (2), p.117-128
Main Authors: Lin, Song-Ming, Huang, Jen-Fa, Yang, Chao-Chin
Format: Article
Language:English
Subjects:
Arrayed-waveguide grating (AWG)
Fiber-Bragg grating (FBG)
Maximal-length sequence (M-sequence) codes
Multiple access interference (MAI)
Optical code-division multiple-access (OCDMA)
Time-spreading/wavelength-hopping ( t-spreading/ λ-hopping)
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Summary:This paper proposes a new hybrid code for optical CDMA systems based on modified maximal-length sequence (M-sequence) codes for wavelength-hopping and prime codes for time spreading. Using the proposed hybrid code, two optical encoder/decoders are constructed using either fiber-Bragg gratings (FBGs) and optical delay lines, or arrayed-waveguide gratings (AWGs) and optical delay lines, respectively. The system performance is compared with that provided by the well-known prime-hop sequence code. The results show that the merged-M-sequence codes not only provide a higher capacity, but can also be realized via a simpler configuration. Furthermore, the proposed code is less expensive than prime-hop code under virtually identical BER conditions.
ISSN:1068-5200
1095-9912
DOI:10.1016/j.yofte.2006.10.007