Open AccessHigh reflectivity superstructured FBG for coherent optical code generation and recognition
Author(s) -
Xu Wang,
Koji Matsushima,
A. Nishiki,
Naoya Wada,
Kenichi Kitayama
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.005457
Subject(s) - apodization , optics , fiber bragg grating , materials science , chip , reflectivity , transmission (telecommunications) , multiplexing , optoelectronics , physics , optical fiber , computer science , telecommunications
The performance of the phase-shifted superstructured fiber Bragg grating (SSFBG) for optical code (OC) recognition was investigated with different reflectivity as well as input pulse width. The auto-correlation peak (PA) and the ratios of PA to the maximum wing level (P/W) and cross-correlation level (P/C) were used to quantitatively evaluate the OC recognition performance. There is a conflict between obtaining high PA and high P/W and P/C ratios in high reflectivity regime. The approach of applying apodization technique to improve the performance in high reflectivity regime is proposed. The comparative experimental investigations with 127-chip 160-Gchip/s SSFBG are carried out to confirm the effectiveness of the proposed approach. Error-free transmission with multiplexing of two active users has been successfully achieved by the apodized SSFBG at a data rate of 1.25 Gbit/s.