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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.
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.
We experimentally demonstrate the active phase control of four Er-Yb doped double-clad single polarized mode fiber amplifiers and we report on theoretical analysis to coherently combine large number of beams.
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.
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 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 present experimental data comparing RZ versus NRZ pulse shapes for optical duobinary modulation at 10 Gb/s. The NRZ pulse shape is found to be superior for duobinary systems dominated by ASE noise and/or dispersion.
We study the power dependence of the back reflection from microsphere resonators. Experimental results are compared with theoretical models. An EDFA (Erbium Doped Fiber Amplifier) based laser with a microsphere mirror is demonstrated.
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