A novel photonic crystal fiber featured by concentric cores is proposed to induce dispersion controllability by photosensitivity. Chromatic dispersion can be changed from -1827 to 72 ps/nm/km with refractive index modulation of 4 x 10(-4) produced in Ge-doped regions in the fiber. Effective mode area of inner mode is as small as 6.4 mum(2). The proposed fiber enables to achieve quasi-phase-matched nonlinear parametric interaction in a single piece of photonic crystal fiber, by periodically alternating dispersion and compensating for phase mismatching caused by the dispersion.
[Show abstract][Hide abstract] ABSTRACT: We demonstrate, for the first time to our knowledge, optical parametric oscillation based on four-wave mixing in microstructure fiber. The measured wavelength-tunability range of the device (40 nm) and the threshold-pump peak power (34.4 W) are in good agreement with the theory of four-wave mixing in optical fibers. The ellipticity of the fiber's polarization modes allows the device to be implemented in a relatively simple Fabry-Perot configuration. Spectral peaks that are due to cascaded-mixing processes are easily observed in our setup, which may provide a way to extend the tunability range of existing high-power lasers.
[Show abstract][Hide abstract] ABSTRACT: The propagation of light in a polarization-preserving optical fiber with a periodically induced birefringence is analyzed theoretically and investigated experimentally. Regions of quasi-phase-matched four-wave mixing are predicted on the basis of an analysis of the light-amplitude fluctuations and full numerical simulations. The experimental results are in good agreement with the theoretical analysis, including the effect of external variation in the birefringence. The process, generated in an optical fiber having an induced periodic birefringence, is similar to that used for second-harmonic generation in a χ(2) waveguide and for modulational instability in optical fibers with periodically varying group-velocity dispersion.
Journal of the Optical Society of America B 07/1997; 14(7). DOI:10.1364/JOSAB.14.001816 · 1.97 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We present ArF laser-induced dynamics of Bragg grating (BG) growths in phosphosilicate-doped or germanosilicate-doped core photonic crystal fibers (PCFs). To this end, we have adapted the technique of H2 loading, usually used in conventional fiber, to the case of microstructured fiber, allowing both the concentration of hydrogen in the PCFs to be kept nearly constant for the time of the exposure and the BG spectra to be easily recorded. We compared the characteristics of BG growths in the two types of PCF to those in conventional step-index fibers. We then conducted a study of the thermal stability of the BGs in PCFs through 30 min of isochronal annealing. At the same time we discuss the role played by the microstructuration and the doping with regard to the grating contrast and the Bragg wavelength stability.
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