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An individual incoherent eavesdropping on a two-way quantum protocol for deterministic communication without entanglement is stimulated. The results show that the protocol remains secure regardless of the noise caused by the eavesdropper.
We have generated squeezed vacuum in optical telecommunication band by a single-pass parametric amplification in periodically poled lithium niobate. The measured noise reduction was 3.1 dB below the shot-noise level.
A cost-effective all-optical 2R regenerator, comprising a compact self-seeded Fabry-Perot laser diode, and a bidirectional EDFA, is proposed. This module, with 10.2-dB gain, achieves 6.4-dB power-penalty improvement over the 1R regenerator in the 100-km transmission.
Employing all-optical means to prepare phase-coherent input signal-idler pairs, we implement a multichannel in-line phase-sensitive fiber-parametric amplifier. Feasibility of three-channel operation using a single pump is demonstrated.
Nonlinear phase noise (NPN) in polarization-division-multiplexed DPSK systems is analyzed. It is found that the absolute NPN is inversely proportional to the square-root of channel spacing, while the differential NPN depends on the launch condition.
Benefits provided by a new high-power and low-noise laser for efficient first-order Raman co-pumping are experimentally investigated. 8 times 10 Gb/s WDM channels have been successfully transmitted over 70dB of standard single-mode fiber with realistic system margins.
We demonstrate transmission of 16 WDM channels at 10 Gbit/s with 50 GHz channel spacing over 3 times 80 km NZDSF, with small OSNR penalty, using only a single Raman-pumped dispersion compensating module positioned before the receiver.
We show that, in a typical terrestrial WDM system, the intra-channel nonlinearity-induced Q fluctuation is comparable to that due to PDL alone, and the inter-channel nonlinearity dominates Q fluctuations at narrow channel spacings.
Error free pulse format conversion from return to zero 2 ps pulses to non return to zero at 10 Gbit/s is achieved by exploring the properties of a semiconductor optical amplifier with integrated saturable absorber.
The composition-spread approach provides a means for evaluating the maximum photoluminescence in new systems of erbium-containing oxides. Hundreds of combinations of zinc-, bismuth-, gadolinium-, and aluminum-substituted SiO2 are evaluated; the Er:Zn-Ge-Si-O system is particularly promising.
We demonstrate the longest unrepeatered and uncompensated SOA-based transmission of 16times10 Gbit/s channels over 140 km single mode (G.652) fiber. We exploit the DPSK modulation format, two commercial SOA devices and a frequency-periodic narrow optical filter.
We investigate wavelength conversion by cross-phase modulation in the presence of strong dispersion and two photon absorption in highly nonlinear singlemode As2Se3 fiber, achieving conversion over a span of 30 nm.
We demonstrate a high-speed green GaN light-emitting-diode for plastic optical fiber communication. By use of n-type doping in barrier layers, superior performance of modulation-speed and output-power to undoped control has been observed.
We have made MOCVD-grown InGaAs photonic crystal vertical-cavity surface-emitting lasers (PhC-VCSELs) for fiber-optic applications. Multi-mode InGaAs VCSELs have achieved a maximum power of over 1 mW. Single-mode characteristics of 0.18 mW of the PhC-VCSELs have been made by using the combined AlOx oxide layer with proton-implantion for better current confinement.
We propose an optical nonlinear phase-shifter based on resonant cavity saturable absorber. A large nonlinear phase-shift was observed in both modeling and experiment. The device would be useful for mitigating fiber nonlinearities in optical domain.
We demonstrate an integratable, high linearity (>15 dBm optical power), high bandwidth ((11plusmn1) GHz), polarization insensitive tapered photodetector with a peak responsivity of (0.25plusmn0.03)A/W. The tapered photodiode of this work consists of a lower passive guide for enhanced fiber coupling, with the active absorption region grown on the waveguide surface.
Polarization-insensitive all-optical wavelength multicasting is demonstrated by spectral filtering from a self-phase-modulated 10-Gb/s return-to-zero signal in a 100-m-long photonic-crystal-fiber. Simultaneous conversion of 6 different wavelengths is achieved without any external light source and polarization control.
A wavelength-parallel polarimeter has been developed for measuring both spectral states-of-polarization and spectral degrees-of-polarization of over 100 (scalable up to thousands) wavelengths in parallel within 1 millisecond.
Direct-detection differential polarization-phase-shift keying is experimentally demonstrated at 10 Gsymbol/s, in which polarization-phase symbols are differentially decoded by using optical interferometric demodulation and electrical multilevel decision without the need of dynamic polarization control.
We report nearly transform limited pulses out of a 2R optical regenerator based in As2Se3 chalcogenide glass fiber, characterized by frequency-resolved optical gating (FROG) and that two-photon absorption improves the device power transfer curve.
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