Title :
Asynchronous Multiuser Coherent OCDMA System With Code-Shift-Keying and Balanced Detection
Author :
Wang, Xu ; Wada, Naoya ; Miyazaki, Tetsuya ; Cincotti, Gabriella ; Kitayama, Ken-ichi
Author_Institution :
Nat. Inst. of Inf. & Commun. Technol., Tokyo
Abstract :
An optical code division multiple access (OCDMA) system with coherent coding, code shift keying (CSK) data modulation, and balanced detection (CSK OCDMA) is proposed and theoretically investigated in this paper. The proposed scheme has better multiuser capability, simpler threshold setting in the receiver, and particularly, enhanced security compares with conventional OCDMA systems. A multiuser CSK-OCDMA system with 511-chip superstructure fiber Bragg gratings and a multiport encoder/decoder (E/D) pair was experimentally demonstrated. A bit-error-rate of less than 10-9 was achieved with up to ten and eight active users at data rates of 1.25 and 10.7 Gb/s, respectively, without any forward-error-correction or optical thresholding. The multiport E/D was used in a novel configuration to process multidimensional optical codes.
Keywords :
Bragg gratings; code division multiple access; decoding; encoding; error statistics; forward error correction; optical fibre networks; asynchronous multiuser; balanced detection; bit error rate; bit rate 1.25 Gbit/s; bit rate 10.7 Gbit/s; code shift keying; coherent coding; data modulation; fiber Bragg gratings; forward error correction; multidimensional optical codes; multiport encoder/decoder; optical code division multiple access system; optical thresholding; Arrayed waveguide gratings; Decoding; Multiaccess communication; Optical filters; Optical modulation; Optical receivers; Optical transmitters; Optical waveguides; Passive optical networks; Security; Code shift keying; Fiber Bragg grating; modulation format; multiport encoder/decoder; optical code division multiple access; optical communication networks;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2007.897675
