The advantage of optical fiber grating sensors are easily implemented multiplexing by using broadband light source.
Erbium doped fiber (EDF) are important as a gain media, because it affects the performance of light sources. We
demonstrated tunable fiber ring laser using Bi2O3-based Erbium doped fiber (BIEDF) and a tunable filter with bandwidth
of 1 nm. We show the BIEDF fiber length dependence, pump power dependence and also show the its spectra. By
increasing fiber lengths of BIEDF, the tunable range changes toward longer wavelengths with varying tunable range. By
using 0.7 m of BIEDF as a gain media, the tunable range reached over 110 nm with just pump power of 100 mW at 1480
nm. Tunable range was insensitive to pump power in this experiment. Also we show the laser spectra. BIEDF laser
shows high optical signal-to-noise ratio (OSNR) higher than 55 dB at over 110 nm tunable range, and 70 dB for 99 nm
(1530 - 1629 nm) tunable range. This means that BIEDF has potential for broad band fiber sensor sources, especially for
fiber grating sensors.
This paper reports on the preparation and the characteristics of Er-doped muliticomponent bismuthate channel waveguide. Dependence of emission lifetime of Er3+ ions on concentration of Er3+ ions is investigated. The concentration of Er3+ in the core film where concentration quenching effect starts is one order of magnitude higher than that of silicate materials. We show that the lower the hydroxyl ion content is, the longer the emission lifetime becomes and the emission lifetime of dehydrated core is the same as that of the fiber perform, namely the same quantum efficiency. The loss of the fabricated channel waveguide measured by cut-back method is 0.15 dB/cm at 1310 nm. Net gain of 8 dB is obtained at 1530 nm by using a 6-cm long waveguide pumped at 980 nm.
This paper reports the fabrication of Bi2O3-based glass planar and channel waveguides using two techniques, respectively hot-dip spin-coating, and direct 244 nm UV-writing into the bulk glass. In the former, a 5 μm core glass film was achieved, which indicates a practical potential for realizing single mode operation channel guides. In the later, the laser written structures obtained showed a positive refractive index change, estimated at 4×10-4 at 633 nm, and a loss of less than 4 dB/cm.
Bi2O3-based thulium (Tm3+) doped glass fiber (Bi-TDF) for S-band amplification was investigated. Tm3+ was doped in Bi2O3-SiO2 based glass and melted using a conventional method. Emission spectra of the 3H4 - 3F4 were measured with pumping at a wavelength of 792 nm using laser diode (LD). Full width of half maximum (FWHM) of the emission is 1.4 times and 1.1 times broader than that of fluoride glass and tellurite glass, respectively. Moreover, the emission peak shifted towards longer wavelength as compared with fluoride and tellurite glasses. Single mode Bi-TDFs with Tm3+ concentrations of 2000 ppm, 3900 ppm and 6000 ppm were fabricated and evaluated with fusion splicing to SiO2 fibers. Gain profiles were measured with bi-directional pumping using 1047 nm Yb fiber lasers. The gain-peaks observed around 1470 nm shifted towards longer wavelength with increasing Tm3+ concentration. Gain properties of Bi-TDF were improved by additional pumping at the wavelength of 1560 nm with Tm3+ concentrations of 2000 ppm and 3900 ppm. A maximum gain over 10 dB of Bi-TDF was obtained using a fusion spliceable Bi-TDF with a length of only 100 cm.
We have fabricated long-period fiber grating by focused irradiation of femtosecond laser pulses at 800 nm. The examined glass fiber is a non-H2-loaded standard single mode fiber for telecommunication. We have found that, after focused irradiation of femtosecond pulses, refractive index at the focal point increases. We examine a thermal stability of the fabricated fiber gratings. Values of the loss peak wavelength and the transmittance of the fiber gratings after heat treatment below 500 degrees Celsius are the same as initial values before heat treatment. The fiber gratings fabricated by focused irradiation of femtosecond pulses at 800 nm have higher resistance to a thermal decay compared with those of UV-induced long-period fiber gratings. We discuss the mechanism of index change. We have proposed that this technique is useful for fabrication of long-period fiber gratings with a superior aging characteristic.
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