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.
© 2009 IEEE
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