Title :
All-Optical Sampling Orthogonal Frequency-Division Multiplexing Scheme for High-Speed Transmission System
Author :
Chen, Hongwei ; Chen, Minghua ; Xie, Shizhong
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A novel high spectral efficiency all-optical sampling orthogonal frequency-division multiplexing (AOS-OFDM) scheme with optical cyclic postfixes (OCPs) inserted is proposed. Ultrashort pulses are used as optical samples and processed by all optical discrete Fourier transformers based on fiber Bragg gratings (FBGs) technique. This scheme includes five subcarrier channels with 20 Gb/s differential quadrature phase-shift keying (DQPSK) modulation of each channel. So, the total bit rate is 100 Gb/s. The spectral efficiency is higher than 1.4. Furthermore, with the help of OCPs, the dispersion tolerance of this 100 Gb/s AOS-OFDM system increases to more than 300 ps/nm, which is much higher than a traditional 100 Gb/s DQPSK system.
Keywords :
Bragg gratings; Fourier transform optics; OFDM modulation; discrete Fourier transforms; high-speed optical techniques; optical fibre communication; optical fibre dispersion; optical modulation; quadrature phase shift keying; sampling methods; telecommunication channels; FBG technique; all optical discrete Fourier transformer; all-optical sampling OFDM scheme; bit rate 100 Gbit/s; bit rate 20 Gbit/s; differential quadrature phase-shift keying; dispersion tolerance; fiber Bragg grating; high-spectral efficiency AOS-OFDM; high-speed transmission system; optical cyclic postfixes; orthogonal frequency-division multiplexing; subcarrier channel; ultrashort pulse; Cyclic postfix (CP); optical sampling; orthogonal frequency multiplexing;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2009.2029063
