Novel Highly Efficient In-Band Pump Wavelengths for Medium Slope Efficiency Holmium-Doped Fiber Amplifiers

Evaluation of the 800-nm Pump Band for Erbium-Doped Fiber Amplifiers

Erbium-doped fiber amplifiers (EDFA’s) can be excited around 800 nm where reliable and low-cost AlGaAs laser diodes can be obtained. We have performed a comprehensive experimental and theoretical investigation of methods to overcome the excited-state absorption (ESA), which is the main obstacle to efficient pumping at this wavelength. The effects of ESA on gain can be reduced at the cost of an ...

High gain holmium-doped fibre amplifiers.

We investigate the operation of holmium-doped fibre amplifiers (HDFAs) in the 2.1 µm spectral region. For the first time we demonstrate a diode-pumped HDFA. This amplifier provides a peak gain of 25 dB at 2040 nm with a 15 dB gain window spanning the wavelength range 2030 - 2100 nm with an external noise figure (NF) of 4-6 dB. We also compare the operation of HDFAs when pumped at 1950 nm and 20...

Highly efficient cascaded amplification using Pr(3+)-doped mid-infrared chalcogenide fiber amplifiers.

We computationally investigate cascaded amplification in a three-level mid-infrared (IR) Pr(3+)-doped chalcogenide fiber amplifier. The overlap of the cross-sections in the transitions (3)H(6)→(3)H(5) and (3)H(5)→(3)H(4) enable both transitions to simultaneously amplify a single wavelength in the range between 4.25 μm and 4.55 μm. High gain and low noise are achieved simultaneously if the signa...

Efficiency of pump absorption in double-clad fiber amplifiers. 1. Fiber with circular symmetry

Fiber Parametric Amplifiers for Wavelength Band Conversion

By using a loop configuration formed by a polarization beam splitter, we experimentally demonstrate that the existing wavelength-division multiplexing (WDM) sources in -band can be wavelength converted to the -band with low polarization sensitivity and low crosstalk. Using a fiber parametric amplifier as a band converter, we achieve experimentally 0.65-dB polarization sensitivity and 4.7-dB con...