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We present characterization of a fiber laser based on newly developed erbium and ytterbium doped double-clad fiber with cross section tailored for direct splicing with the pump and signal fibers.
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.
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.
Third order cascaded Raman shifting is used to generate light to 1867 nm in sulfide fibers, and the nonlinearity is measured to be ~5.7 times 10-12 (m/W). Damage at ~1 GW/cm2 limits the wavelength shift range.
An optically integrated frequency-comb-system based on a passively-mode locked, fCEO-locked Er:soft-glass-fiber-laser and a PPLN-waveguide phase-sensor is demonstrated. The oscillator emits pulses with 61 nm spectral bandwidth and 170 MHz repetition frequency.
We report a tunable laser source emitting in the visible (530 nm, 630 nm) and the near infrared (775 nm, 1060 nm, and 1550 nm) regions by frequency summation of a dual wavelength Er/Yb co-doped fiber laser.
We fabricate a sub-ps erbium doped fiber laser using a carbon nanotube-polymer composite mode-locker. The spectral and pulse width data are analysed to evaluate the contribution of different physical process into ultra-short lasing.
Synchronization of actively Q-switched Erbium and Ytterbium doped fiber lasers with a single electrostatically actuated deformable metallic micro-mirror is reported. Sum frequency generation in PPLN crystal leading to a tunable red radiation is demonstrated.
We report using short, heavily-doped active phosphate fiber for generation of picosecond pulses at 1.5 mum, with the peak power of 19 kW which results in a record-high aerial power density of 24 GW/cm2 in the fiber core.
Soliton self-frequency shifting from 1 mum to 1.5 mum, connecting the ytterbium and erbium emission wavelengths, is demonstrated. It is confirmed that the timing jitter induced by the shifting is mainly caused by the laser intensity noise.
Er3+-doped fiber-lasers efficiently generate frequency-combs for optical frequency metrology. 3.5 nJ energy, 35 fs duration and 100 MHz repetition-rate laser pulses are used to obtain an octave spanning frequency-comb in the visible.
We report a bandwidth-enhanced multi-wavelength source from a stimulated Brillouin scattering assisted erbium-doped fiber laser using four-wave-mixing in a 35-cm highly nonlinear bismuth oxide fiber. Tuning of output wavelengths and wavelength spacing have been demonstrated.
An EDFA bypass and filtering architecture is demonstrated , allowing a 1310 nm QKD channel to be transmitted over the same fiber as four 1.5 mum WDM channels which are amplified in mid-span.
The carrier-envelope phase coherence time of a mode-locked erbium fiber laser was measured to be less than 4 mus outside the feedback loop. The fiber amplifier induced noise was also determined for a cascaded amplifier.
Pulse propagation in Er3+-doped fiber amplifiers (EDFA) is studied within the framework of a spectrally-resolved pulse rate-propagation equations model. Calculated pulse spectrograms demonstrate the effects of dispersion on sub-picosecond pulse propagation in EDFAs.
We report on the realization of FBGs in a standard Er-doped fiber written into the non-photosensitive core by femtosecond laser pulses. Efficient laser operation is demonstrated using this technique.
We describe a lidar system based on erbium doped fiber amplifiers, designed to make range resolved measurements of CO2 within the lower atmosphere at very high precision at 1571 nm.
We demonstrate an all fiber-based OTDM receiver incorporating clock recovery and demultiplexing functions using short lengths of bismuth oxide-based nonlinear fiber and erbium-doped bismuth oxide fiber. Error-free, overall operation is achieved at 80 Gbit/s and the clock recovery is also shown to be operable at 160 Gbit/s.
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