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In this paper, we review the multicarrier technology using offset quadrature amplitude modulation (QAM) for optical communication systems and networks. We investigate the orthogonality condition of this technology and discuss its electronic and optical domain implementation. It is shown that discrete-Fourier-transform based offset-QAM orthogonal frequency division multiplexing (OFDM) can greatly relax...
We investigate a carrier frequency offset (CFO) estimation algorithm for coherent optical quaternary phase-shift keying (QPSK) receivers. The algorithm utilizes the phase difference between the samples with different time-domain separations, so that the estimation accuracy can be significantly enhanced, compared with the algorithm that only compares the phase difference between adjacent samples. In...
We show that joint symbol synchronization and channel estimation can be realized using single symbol with negligible penalty in 16QAM optical F-OFDM. This facilitates the application of F-OFDM for burst-mode transceivers in optical packet networks.
In order to improve the performance of all-optical OFDM systems, we propose an electronic processing technique, which shapes both the spectral profile of the sub-channel signal before demultiplexing and that of the demultiplexer, to achieve near crosstalk- and ISI-free operation.
We demonstrate the first experimental implementation of an optical Fast-OFDM (FOFDM) system with a reduced sub-carrier spacing equal to half of the symbol rate. The performance was evaluated in terms of BER for 7.174Gbit/s and 14.348Gbit/s BPSK-FOFDM signals.
A chromatic dispersion (CD) monitoring method for differential phase-shift keying (DPSK) signals using an optical delay interferometer with phase error has been demonstrated. This method can be used for CD monitoring and discriminate dispersion polarity.
We proposed and demonstrated the optical frequency-hopping system for long distance secure communications. 10.6-Gb/s error-free transmission through 20-km DSF and 40-km SMF was implemented in a 2-frequency-hopping system.
We employ a delay interferometer to enhance the data rate of the semiconductor-optical-amplifier-based inverse-return-to-zero (IRZ) generation to 40 Gbit/s and investigate the improved performance of 40-Gbit/s IRZ/10-Gbit/s DPSK orthogonal modulation using reshaping-assisted demultiplexer in optical-time-division-multiplexed systems.
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