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We demonstrated a new method to determine the optical fiber parameters using long-period fiber gratings and a search procedure. The gratings with different pitches were inscribed to measure experimental phase-matching curves. The theoretical phase-matching curves were found by calculating the effective refractive indices of fiber modes. In the search procedure, the optical fiber parameters were varied...
Negative-index fiber Bragg gratings (FBGs) were fabricated using 800 nm femtosecond laser overexposure and thermal regeneration. A positive-index type I-IR FBG was first inscribed in H2-free fiber with a uniform phase mask, and then a highly polarization dependent phase-shifted FBG (PSFBG) was created from the type I-IR FBG by overexposure. Subsequently, the PSFBG was annealed at 800 °C for 12 hours...
High quality FBGs have been fabricated in our lab using three types of femtosecond laser inscription techniques, i.e. Phase Mask method, Line-by-Line method and Point-by-Point method. It is found that Phase Mask method shows the best spectral quality and repeatability but the flexibility is poor; Line-by-Line method exhibits good flexibility where nearly all the grating parameters can be adjusted...
Long period gratings with different pitches are fabricated in single-mode fibers by use of a high-intensity 800 nm femtosecond laser. The response of the grating resonance wavelength to temperature is measured to be about 0.1 nmdeg/C.
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