Modeling of a Time-Spreading OCDMA System Including Nonperfect Time Gating, Optical Thresholding, and Fully Asynchronous Signal/Interference Overlapping

Author

Amaya, Waldimar ; Pastor, Daniel ; Capmany, José

Author_Institution

Univ. Politec. de Valencia, Valencia

Volume

26

Issue

7

fYear

2008

fDate

4/1/2008 12:00:00 AM

Firstpage

768

Lastpage

776

Abstract

We present an extended theoretical model for time-spreading optical code-division multiple-access (OCDMA) coherent systems. We have updated well-known model to evaluate multiuser interference to include arbitrary encoded/decoded chip shape, receiver transfer function, and optical thresholding before detection. Full asynchronous regime is also assumed to exploit statistical benefits over the dominant primary beat noise. The model provides clear improvements in terms of number of users and required intercodes crosstalk, leading to more feasible OCDMA systems.

Keywords

code division multiple access; code division multiplexing; crosstalk; decoding; encoding; optical fibre communication; optical receivers; optical transfer function; asynchronous signal-interference overlapping; coherent systems; decoded chip shape; encoded chip shape; intercode crosstalk; multiuser interference; nonperfect time gating; optical code-division multiple-access; optical communications; optical thresholding; primary beat noise; receiver transfer function; time-spreading OCDMA; Decoding; Interference; Multi-stage noise shaping; Multiaccess communication; Optical crosstalk; Optical detectors; Optical noise; Optical receivers; Shape; Transfer functions; Fiber optics and optical communications; multi plexing; networks; optical code-division multiple access (OCDMA);

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2007.915209

Filename

4484122