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A helical long-period grating (HLPG) was written in a polarization maintaining fiber (PMF) with CO2 laser. The twist characteristics of individual and cascaded PMF-HLPG were investigated experimentally. It was found that PMF-HLPG behaved differently with a different light input. When a polarized light was launched into the cascaded PMF-HLPGs with opposite helical direction, a high twist sensitivity...
We propose a novel mode converter (MC) based on multimode interference (MMI). This MC taking advantages of long-period fiber grating and multimode interference, it not only has high conversion efficiency, but also greatly reduces the interference between modes.
We propose the fabrication of double-helix chiral long-period fiber grating by twisting polarization-maintain fiber when the fiber is heated by CO2 laser irradiation. Different with conventional long-period fiber grating, the chiral grating is found to be insensitive to the fiber bending due to its helical waveguide structure.
We demonstrated the fabrication of the chiral long-period grating (CLPG) with the helical structures by twisting conventional single-mode fibre while the fibre was exposed unilaterally by CO2 laser. The bending and surrounding refractive index characteristics of the fabricated CLPG were investigated experimentally. Experimental results show that the CLPG has high bending sensitivity of 19.336 nm/m...
A chiral long-period grating (CLPG) was fabricated successfully by scanning CO2 laser in a twisted conventional single-mode fiber. The strong mode coupling can be achieved in a short grating length. The sensing characteristics of the CLPGs were investigated experimentally. Compared with the conventional long-period fiber gratings, the CLPGs were found to have the similar temperature and refractive...
We demonstrated the fabrication of long period fiber gratings written in two-mode fiber as mode converter to realize the mode conversion between LP01 mode and LP11 mode with an efficiency of up to 99.9%.
Wavelength Switching and multi-wavelength picosecond pulses are generated from a self-seeded Fabry-Perot laser diode and a tilted multimode fiber Bragg grating. 9 discrete wavelengths are obtained by changing the modal distribution in the grating. The sidemode suppression ratio is better than 25dB and pulsewidth is no more than 42ps.
We demonstrate the generation of wavelength-switchable picosecond pulses using a self-seeded Fabry-Perot laser diode and a tilted multimode fiber Bragg grating, where wavelength selection is achieved by changing the modal distribution in the grating.
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