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In this paper we propose a new technique that enables optical single sideband generation for optical subcarrier multiplexing. A high sideband suppression ratio is achieved across the full RF spectral band.
We proposed and experimentally demonstrated polarization shift keying (PolSK) label over vestigial sideband carrier suppressed return-to-zero (VSB-CSRZ) payload for 43 Gb/s all-optical label switching network. This is a candidate technique for the next generation optical network.
Slow and fast light are achieved using novel master-modulated injection-locked 1.55 mum VCSELs at room-temperature. We achieve a full RF phase change of 2pi at >10 GHz over a wide bandwidth ~8 GHz.
We demonstrated 80 Gb/s optical differential quadrature-shift-keying modulation, by using a single-chip integrated LiNbO3 modulator with two sub Mach-Zehnder interferometers, where 40 Gb/s in-phase and quadrature data were, simultaneously, fed to the modulator.
We demonstrate photon-counting communications using a NbN-nanowire superconducting detector. The fast response time of this detector enables error-free communications using pulse-position modulated data at 10-GHz slot rates and data rates >780 Mbit/s.
3-bit/symbol optical modulation scheme is proposed using dark-return-to-zero (DRZ), differential-phase-shift-keying (DPSK) and polarization-shift-keying (PolSK). Transmission performance of the 3 times10 Gb/s signal is investigated.
We demonstrate optically-matched preamplified-DPSK communications at 2.5 Gbit/sec and 1557 nm wavelength, with uncoded sensitivities of 25 photons/bit at 10-9 bit-error-rate, falling less than 1 dB from quantum-limited theory.
We explore monitoring techniques by simulation and experiment for 2-and 4-level, intensity-and phase-modulation data. DOP for PMD up to 200-ps and clock-tone for dispersion up to 1500-ps are examined for 10-Gsymbol/s RZ and NRZ systems.
We propose and analyze a novel use of electronic-signal-processing to enhance spectral efficiency of 10 Gb/s binary NRZ systems. Our analysis shows that up to 1.6 bits/sec/Hz of spectral efficiency is achievable using proposed technique.
We report a novel method to enhance the performance of Brillouin optical correlation domain analysis system based on intensity modulation of light source. Distributed measurement over 1-km range is successfully demonstrated with 30-cm spatial resolution.
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.
Techniques for generation and detection of optical minimum-shift keying signals are presented. The property of optical MSK and expected performance in high speed optical transmission system are discussed.
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