Wavelength-time codes with maximum cross-correlation function of two for multicode-keying optical CDMA

Author

Chang, Cheng-Yuan ; Yang, Guu-Chang ; Kwong, Wing C.

Author_Institution

Dept. of Electr. Eng., Nat. Chung-Hsing Univ., Taichung

Volume

24

Issue

3

fYear

2006

fDate

3/1/2006 12:00:00 AM

Firstpage

1093

Lastpage

1100

Abstract

In this paper, a new family of wavelength-time codes with expanded code cardinality and the maximum cross-correlation function of 2 (i.e., lambda_c=2) is constructed and analyzed. One application of the large code cardinality of our lambda_c=2 codes is multicode-keying wavelength-time optical code division multiple access (O-CDMA), in which each user is allocated with multiple code matrices, instead of just one code matrix in the conventional ON-OFF keying (OOK) O-CDMA. System throughput is increased because a lower baud rate O-CDMA system can be used to support higher bit-rate transmission since each code matrix is used to represent a "symbol" of several data bits. User code confidentiality is improved because of symbol transmission. The performances of two multicode-keying O-CDMA schemes with the new lambda_c=2 wavelength-time codes are also analyzed. The results in this paper show that there is a tradeoff between the performance and the number of code matrices per user

Keywords

amplitude shift keying; code division multiple access; codes; correlation methods; matrix algebra; optical fibre communication; ON-OFF keying O-CDMA; expanded code cardinality; high bit-rate transmission; maximum cross-correlation function; multicode-keying CDMA; multiple code matrices; optical CDMA; optical code division multiple access; symbol transmission; user code confidentiality; wavelength-hopping time-spreading; wavelength-time codes; Arrayed waveguide gratings; Bragg gratings; Fiber gratings; Multiaccess communication; Multiple access interference; Optical waveguides; Performance analysis; Throughput; Transmission line matrix methods; Two dimensional displays; Multicode keying; optical code division multiple access (O-CDMA); wavelength-hopping time-spreading codes;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2005.864002

Filename

1605310