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We have experimentally demonstrated quantum key distribution with a heralded single photon source and a photon number resolving detector. Numerical calculations have shown the expansion of the distance.
We realized a wavelength-tunable mode-locked fiber laser using intracavity dispersion. Continuous tuning over 100 nm was obtained at a sweep rate of 20 kHz. Discrete tuning was achieved over 39 nm by inserting a FFPI into the cavity.
We report a polarization-independent 80 Gb/s optical demultiplexer based on cross-phase modulation in 2 meters of bismuth-oxide fiber. We show error- and penalty-free performance even when the polarization state is randomly scrambled.
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.
We report on the quality of ultrashort pulses that are generated by a chirped pulse fiber amplification system when different pulse shapes are amplified. We focus thereby on sech2, parabolic and experimental parabolic pulse shapes.
A switchable multiwavelength erbium-doped fiber laser with a multimode FBG and highly nonlinear PCF is demonstrated. Stable five-wavelength operation with 0.8 nm spacing was achieved. Switching between stable one- to four-wavelength operations is also demonstrated.
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.
We demonstrate an all-optical polarization controller using the injection-locking induced transverse-mode switching of 1.5 mum elliptical-apertured VCSEL. The polarization of an output fundamental-mode was stabilized even for randomly polarized input light injected into a high-order transverse mode.
A light source using sum-frequency generation is developed for the ytterbium clock transition at 578 nm. Doppler-free spectroscopy of iodine lines near the Yb clock transition and frequency stabilization are demonstrated with the light source.
Using an accurate full-vectorial finite element method, a realistic model of a fabricated dispersion compensating photonic crystal fiber is analyzed. An almost flat Raman-gain spectrum (gain-ripples at just plusmn0.48-dB) is obtained using a single pump.
Watts-level, continuous-wave pumped supercontinua, 1.06-1.7 mum, generated in a new low OH-loss PCF exhibit distinct spectral and noise dynamics when pumped with either high or low-intensity-noise 1 um sources. Applications to ultra-low-noise mum-scale OCT are analyzed.
Soft-glass photonic-crystal fiber is used to generate broad supercontinuum using an all-fiber-femtosecond laser. The bandwidth exceeds 1700 nm and has average powers in excess of 100 mW with 46-MHz repetition rate.
We demonstrate efficient compression of low-power 6 ps pulses down to 420 fs pedestal free pulses at 1.5 mum in an all-fiber scheme employing only 4 meters of As2Se3 fiber and a tailored chirped fiber Bragg grating.
We have demonstrated a polarization-interleaved WDM system with a two-orthogonal-pump OPA (2OP-OPA). The sensitivity has been improved by about 2 dB compared to its counterpart with all WDM channels co-polarized with the same signal gain.
Fiber-delivered laser source provides the flexibility desired for optical imaging systems. Here we demonstrate laser-scanning coherent anti-Stokes Raman scattering imaging with two picosecond laser sources delivered by large mode area photonic crystal fiber.
We have demonstrated all-optical on-off switching at 10 Gbit/s using four-wave mixing in only 1.9 m of bismuth-based highly nonlinear fiber. The all-optical on-off switch has a fast response time and high ON/OFF switching ratio.
We present experimental and theoretical investigation of modulation instability process in large normal dispersion regime leading to visible continuum generation. The influence of the input power and polarization state of the pump wavelengths are analyzed.
Focusing the pump in type-II SPDC not only increases the efficiency of photon collection with single-mode fibers, but also increases the spatial distinguishability of the photons, in some cases reducing the polarization entanglement.
All-fiber chirped-pulse amplification based on a large-mode-area Er:Yb-doped photonic-crystal fiber is presented. A dispersion-variable hybrid fiber stretcher compensates the peculiar dispersion of the hollow-core photonic-bandgap fiber compressor yielding transform-limited 440-fs pulses with 1-W average power.
We demonstrate the use of a prism-grating sequence to reduce third-order dispersion inside a modelocked Yb fiber laser. 33-fs pulses, the shortest from a fiber oscillator, can be generated with extremely clean profiles.
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