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In this paper, we demonstrate a 2μm switchable single-longitudinal-mode dual-wavelength fiber laser based on composite cavity and a core-offset structure. The fiber laser is switchable, power-equalized and operating in single-longitudinal-mode.
Two novel configurations of multi-parameter fiber-optic sensing systems based on the fiber random grating are reported. The fiber random grating is fabricated through femtosecond laser induced refractive index modification over a 10cm standard telecom single mode fiber. In one configuration, the reflective spectrum of the fiber random grating is directly detected and a wavelength-division spectral...
A highly sensitive twist sensor without temperature cross sensitivity based on tapered single mode-thin core-single mode fiber offset structure is proposed and experimentally demonstrated. The two parameters mentioned above can be measured simultaneously without cross sensitivity. The twist sensitivity of 0.12dB/° is achieved by tracking power variation of the resonant wavelength, and the wavelength...
Statistical characteristics of location related intensity distribution in phase-sensitive optical time-domain reflectometry ($\Phi $ -OTDR) are theoretically analyzed and experimentally demonstrated. The polarization diversity scheme is adopted into the $\Phi $ -OTDR with a coherent detection scheme to effectively mitigate the polarization fading effect. A real distributed sensing application for...
We demonstrated a 2µm switchable, tunable and power-controllable dual-wavelength fiber laser by adjusting the center wavelengths of FBGs and the cavity losses, respectively. The topology is based on the parallel connection of FBGs using 3×3coupler.
The changes of birefringence in FBGs induced by ultrafast-IR and CW-UV lasers in SMF28 fibers are measured during grating inscription. Throughout annealing up to 800 ??C, the birefringence reductions are also examined.
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