We demonstrate the fabrication of a kind of asymmetrical twin core fiber, which is easy spliced with standard single
mode fiber. This fiber is designed to be used for passive mode-locking in fiber lasers.
The fluorescence intensity ratio (FIR) technique for optical fiber-based temperature sensing is discussed in many
previous papers. But in the high temperature sensing the FIR technique has been researched a little. In this paper, the
temperature dependence of fluorescence in erbium-doped fiber between ~700 and ~1300 °C; is discussed and
experimentally demonstrated. 1450nm and 1530nm wavelengths are chosen to calculate the FIR, and the temperature
coefficient could achieve ~ 0.003dB/°C.
The temperature dependence of fluorescence in erbium-doped silica fiber between ~-30 and ~150°C is discussed.
980nm pumping configuration is used in our experiment. 1450nm and 1531nm wavelengths are chosen to calculate the
FIR (fluorescence intensity ratio) at the first time instead of the mostly used wavelengths 525nm and 550nm. It shows
that as the temperature increases, the fluorescence intensity increases obviously at short wavelengths but changes a little
at long wavelengths. The temperature coefficient can achieve ~0.023dB/°C, and its resolution is improved as the
temperature decreases. Because there are many effects in our experiments, so it shows a deviation from the behavior of
simulation.
A high concentration silica host Erbium Doped Fiber with Bismuth-Gallium-Aluminum co-doped was fabricated. The
absorption coefficient of this fiber was up to 19dB/m at the wavelength of 980nm and 42dB/m at 1530nm. Ring structure
lasers with different fiber lengths were presented. Their output characteristics were measured and analyzed.
The dispersion properties of the index-step higher order mode dispersion-compensating fibers (HOM-DCFs) are
simulated using an unequal interval finite difference method in this paper. Large negative dispersion of the first few
higher order modes (HOMs) near cutoff are studied comparatively, which is helpful for designing the dispersion
compensator based HOM-DCFs.
A novel design of M-Profile Ytterbium doped Fibers (YDFs) for high power fiber Lasers was given. The output power
was two times higher than that in standard double-cladding fiber under the same threshold of damage.
The relationship between the gain flatness performances with the pump wavelength spacing in single-stage backward-pumped
distributed fiber Raman amplifiers (B-DFRAs) were demonstrated theoretically. It was shown that the gain
spectrum of B-DFRA which pump wavelengths were arranged in a geometric proportion interval sequence were flatter
than one which pump wavelengths were arranged in an equal interval sequence in the same conditions.
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