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We experimentally demonstrate a 16-QAM transmitter using a monolithically-integrated quad Mach-Zehnder in-phase/quadrature (QMZ-IQ) modulator with binary driving electronics.
We report on the latest development in electro-optic chaos communications intended for physical layer optical data protection. The nonlinear delayed feedback scheme makes use of the optical phase as the dynamical variable exhibiting a high complexity broadband chaos. The proposed setup was found to be a superior alternative approach to the most popular way in Optics to generate chaos, the feedback...
We describe supercontinuum generation in a short photonic crystal fiber with all-normal group velocity dispersion. We observe a 200 nm broad self phase modulation spectrum, which is expected to have high temporal coherence.
Authors realized the optical switch satisfying high-speed response (<;10 nsec), polarization independent operation and low driving voltage of 3 volt by constructing a new structure on LiNbO3 substrate for the first time in the world.
A novle tunable broadband optical delay scheme using phase modulation is proposed and experimentally demonstrated. A 2ps Gaussian pulse is frequency-chirped, phase-modulated by a ramp signal and delayed up to 9 times of pulse width.
We report the continuous operation of an actively stabilised gigahertz clocked quantum key distribution (QKD) system, with an average secure key rate of 1 Mbit/s over a distance of 50 km.
A novel scheme using single phase modulator for simultaneous generating and decoding of time domain spectral phase encoded signal and DPSK data modulation is proposed and experimentally demonstrated for five 16-chip, 40GHz/chip optical code patterns.
A technique for direct detection of the phase of optical signals using an injection-locked VCSEL is presented. Conversion of the phase modulation to modulation of the voltage across the VCSEL is experimentally demonstrated.
An innovative technique to achieve bidirectional mode-locking of a fiber ring laser is demonstrated using two amplitude modulators passively driven by a signal regenerated from the laser's own 5.1MHz repetition rate.
A 10.5-kHz train of 2.5-ns optical pulses with 1.15-nm bandwidth centered at 1053-nm suitable for seeding chirped-pulse amplification is produced in a programmable, all-fiber system through direct phase modulation.
We demonstrate an all-fiber, 2-ps, 1063-nm source using time-lens compression of a continuous-wave laser, with variable repetition rates, pulse sequence, and alternating pulse amplitude. We demonstrate Cerenkov radiation in a higher-order-mode fiber using the source.
We develop a description of nonlinear optics where quasi-phase-matching of both momentum and energy mismatch can be implemented by employing both spatial and temporal modulations. This generalized quasi-phase-matching technique could allow unique applications.
We demonstrate an all-optical method for characterizing ultrafast pulses by differential tomography, using four-wave mixing. The technique is used to measure dispersion for various lengths of silica fiber.
Optical phase modulator based on OIL-VCSEL is investigated for the first time. Simulation shows a directly modulated OIL-VCSEL can function as a key component in QPSK or 8PSK transmitters. Preliminary phase-shift-keying characteristic is demonstrated experimentally.
We demonstrate a novel method of phase-contrast CARS spectroscopy by using an optical bandpass filter and a mechanical modulator instead of a 4f pulse shaper used in previous studies. Our system has several advantages over the conventional one; the simplicity of the setup, a larger throughput, and the higher data rate of measurements. We use the known vibrational frequencies of chloroform to verify...
Attosecond optical waveforms of arbitrary shape are synthesized and verified using a Raman-generated comb of frequencies that have a controlled and stable carrier-envelope phase.
A semiconductor laser is mode-locked by phase modulation at one-half the free spectral range of an intra-cavity etalon. The optical comb-lines are locked to the transmission peaks of the etalon using a Pound-Drever-Hall scheme.
Double phase modulation technique is presented to relax the accuracy of the modulation index. A bias stability of 3.14×10-3 rad/s is demonstrated in a resonator micro-optic gyro with the silica waveguide ring length of 7.9 cm.
We demonstrate ultrafast optical signal processing up to bitrates of 170 Gbit/s. Silicon-on-insulator waveguides are defined by CMOS technology. In addition, an organic cladding pro-vides either X(3) or X(2)-nonlinearities that are not impaired by two-photon absorption. With a proper waveguide design, the influence of two-photon absorption in silicon is greatly reduced.
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