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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 report helicoidal long-period grating by twisting photonic crystal fiber under CO2 laser irradiation and investigated its novel characteristics. The fabricated PCF-LPG endows unique resonance tuning capability with low polarization-dependent loss and thermal shift.
Flat and single mode supercontinuum generation spanning from 700 to 2350 nm was demonstrated using a nanosecond microchip laser and conventional cut-off shifted SMF. This configuration is attractive as a simple and low-cost light source.
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.
5-order enhancement in system sensitivity of resonator fiber optic gyroscope by polarization-noise suppression using twice 90deg polarization-axis rotated splicing is numerically demonstrated. The optimal condition to suppress polarization-noise is demonstrated experimentally by temperature control.
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.
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.
The distribution of an ultrafast optical pulse train over multiple fiber links with long-term stable timing precision within 2 femtoseconds rms is accomplished by integrating a polarization maintaining output with 300 meter long fiber links.
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.
We have developed the technique of two-photon joint temporal density measurements for temporal state characterization, thus facilitating two-photon generation with high temporal entanglement or nearly factorizable outputs by controlling the ultrafast pump bandwidth.
We observe for the first time the simultaneous emission of two resonant radiation frequencies by optical solitons in a small waveguiding glass-feature within the cladding of a HC-PCF. We attributes this phenomenon to the unusually large 4th-order GVD coefficient of the waveguide.
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.
Higher-order-modes of a 70-mum core-diameter, Er-doped-fiber are characterized over a broad wavelength range using a supercontinuum with spatially and spectrally resolved imaging. Pumping the Er-doped-fiber with 1480-nm in the fundamental mode decreases the higher-order-mode content.
We demonstrate a carrier-envelope-offset-locked frequency comb with 500-pJ pulse energy, with increased coupling efficiency into a tellurite PCF by using angled-V-groove splicing. Carrier-envelope-offset stabilization at telecommunications wavelengths is achieved at the lowest pulse energy.
We demonstrate wavelength conversion based on cross-phase modulation induced nonlinear polarization rotation in a carbon nanotubes-filled micro-slot fiber device. Wavelength converted signal with 3-dB power penalty for 10 Gb/s NRZ signal is obtained.
Passive synchronization is demonstrated between the self-similar Yb-fiber and the stretched-pulse Er-fiber mode-locked lasers. The pulse repetition rates of the two mode-locked lasers can keep locked when multiple-pulse bound states or periodic pulse collisions occur.
Tunable narrow-linewidth operation of an Yb-doped fiber amplified-spontaneous-emission (ASE) source is reported. The source yielded 135 mW output at 1040 nm and could be tuned from 1034 nm to 1084 nm. The prospects for improvement in performance are considered.
The influence of fiber glass composition on dynamics of pump-induced refractive index changes in Yb-doped silicate fibers is reported. The Yb-ions polarizability difference responsible for the effect is determined for fibers with different Yb-ion lifetimes.
We demonstrate a fast control of an octave-spanning fiber-based frequency comb with an intracavity electro-optic modulator. The servo bandwidth of both repetition and carrier-envelope offset frequency is greater than 200 kHz.
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