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We design dispersion-compensated Raman/EDFA hybrid amplifiers recycling residual Raman pump for WDM systems. The first experimentally demonstration of broad band gain-clamped and gain flattened dispersion-compensated Raman/EDFA hybrid amplifiers by recycling residual Raman pump with a single FBG for WDM systems.
We demonstrate robustly single-mode power scaling in fiber laser systems built using 35-mum core Yb-doped double-clad chirally-coupled-core (CCC) fibers. Up to 250 W have been demonstrated up to date and further power scaling is in progress.
We propose pilot decision-aided maximum likelihood phase estimation for nonlinear-phase-noise-dominant coherent optical phase-shift-keying (PSK) systems. The receiver sensitivity is shown to be improved by ~1 dB compared to the differentially encoded PSK counterparts.
Relaxation and emission dynamics of a dense quantized magneto-plasma excited by intense femtosecond laser pulses in In0.2Ga0.8As/GaAs multiple quantum wells are probed by time-resolved transient absorption and time-resolved photoluminescence experiments in high magnetic fields.
We report an experimental study of pulsed Raman gain in As2Se3 chalcogenide fiber, for pump pulses between 1470 nm and 1560 nm, achieving the highest Raman gain at the longest pump wavelength, where two-photon absorption is lowest.
By using two-section fiber where the first section has no spin and the second one is periodically spun, we demonstrate reduced polarization dependent gain and polarization mode dispersion in a distributed fiber Raman amplifier.
We demonstrate broadband spectral phase conjugation based on temporal imaging via four-wave mixing and show for the first time compensation of pulse distortions due to second- and third-order dispersion and self-phase modulation.
Femtosecond laser-written active waveguide devices, namely waveguide amplifiers and DFB waveguide lasers were fabricated in doped phosphate glasses. Gain was achieved across the complete C-band and a laser with output power of 102 mW was demonstrated.
Fiber slow light systems are at a turning point moving from a laboratory research to real applications. The possibility to shape the spectral resonance in Brillouin slow light leads to optimized configurations and innovative solutions.
Guided acoustic wave Brillouin scattering (GAWBS) in PCFs is altered by the air-silica structure of the inner cladding and does not depend on the cladding diameter as with standard fibers. This dependence is investigated.
We realized a continuous-wave terahertz spectrometer based on optical heterodyning of two near-infrared distributed-feedback diode lasers. Using active frequency stabilization we achieve 1 MHz resolution and a signal-to-noise ratio up to 80 dB.
A radially polarized beam was amplified up to 1.1 W by passing through an Yb-doped double clad fiber pumped by a semiconductor laser, maintaining both the polarization and intensity patterns of the input beam.
An all-fiber-integrated supercontinuum laser having time-averaged power scalable up to 10.5 W with diffraction limited beam quality is demonstrated. The SC pulses can be generated with arbitrary modulation patterns having on/off durations as short as 10 muS.
Calculations show qualitative changes in relative index and group delay induced by typical coiling of fiber. Comparison with S2 measurement shows excellent agreement in relative group delay.
The polarization evolution of stimulated Brillouin scattering amplified signals in the presence of fiber birefringence is examined in analysis, simulation and experiment. The signal polarization is drawn towards the conjugate of the pump polarization.
Phosphate glasses are excellent host materials for lasers using rare-earth ion transitions. Combining highly-doped phosphate glasses and advanced fiber drawing techniques, we developed phosphate glass fiber lasers and will review recent advances in their performance.
We demonstrate the generation of 48 fs, 226 nJ pulses from an Yb-doped fiber amplifier with 18 W of average power. The system uses a simple stretcher-free, single-stage amplifier configuration. Gain fiber length and pump wavelength are chosen in order to achieve the optimum pulse width and pulse energy.
Ytterbium doped Bi2O3-based glasses have been developed. The absorbance is as high as 2600 dB/m/mol. Maximum absorption of 7800 dB/m is achieved. Bi2O3-based Ytterbium doped fiber is fabricated, and demonstrated fiber lasers using newly developed fibers.
Efficient generation of a cascade of four-wave mixing products using a low-dispersion highly nonlinear fiber is demonstrated. The measured optical frequency comb (with a spacing of 100 GHz) spans over more than 350 nm.
Spatially resolved spectral interferometry is used to measure the mode content of a Yb-doped photonic crystal-fiber amplifier having a 2300-mum2 mode area. The impact of misalignment at signal injection on the relative mode powers is quantified.
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