Scattering of a dispersive wave by optical solitons is studied experimentally in photonic crystal fibers in cases when the soliton and the dispersive wave have either identical or orthogonal polarization states. Observations of new resonant frequencies are reported. The experimental results are compared to numerical simulations and predictions from the recently derived wave vector matching conditions.
Continuous-wave tunable optical parametric generation in a photonic-crystal fiber
G. K. L. Wong,
A. Y. H. Chen,
S. G. Murdoch,
R. Leonhardt,
J. D. Harvey,
N. Y. Joly,
J. C. Knight,
W. J. Wadsworth,
P. St. J. Russell
Journal of the Optical Society of America B
22
2505-2511
(2005)
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Continuous-wave and quasi-cw operation of tunable optical parametric generation has been demonstrated in a photonic-crystal fiber. The frequency shift of the generated sidebands, which arise from modulation instability, depends strongly on the detuning of the pump from the fiber’s zero-dispersion wavelength. Over 30 nm of sideband tunability has been demonstrated using a 300 mW cw pump, and over 185 nm of tunability using a 1.6 W quasi-cw pump. Continuous wave and quasi-cw pumps eliminate the detrimental effects of pump–sideband walk-off. In the absence of walk-off it is the fluctuations in the index profile of the photonic-crystal fiber along its length that limit the tunable sideband range.
Characterization of chromatic dispersion in photonic crystal fibers using scalar modulation instability
G. K. L. Wong,
A. Y. H. Chen,
S. W. Ha,
R. J. Kruhlak,
S. G. Murdoch,
R. Leonhardt,
J. D. Harvey,
N. Y. Joly
Optics Express
13
8662-8670
(2005)
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A simple and accurate method is proposed for characterizing the chromatic dispersion of high air-filling fraction photonic crystal fibers. The method is based upon scalar modulation instability generated by a strong pump wave propagating near the zero-dispersion wavelength. Measuring the modulation instability sideband frequency shifts as a function of wavelength gives a direct measurement of the fiber’s chromatic dispersion over a wide wavelength range. To simplify the dispersion calculation we introduce a simple analytical model of the fiber’s dispersion, and verify its accuracy via a full numerical simulation. Measurements of the chromatic dispersion of two different types of high air-filling fraction photonic crystal fibers are presented.
Linear and nonlinear guidance in an ultralow loss planar glass membrane
N. Y. Joly,
T. A. Birks,
A. Yulin,
J. C. Knight,
P. St.J. Russell
We describe the fabrication and characterization of a free-standing silica glass membrane waveguide formed using fiber fabrication processes. The membrane has a thickness of 0.6 mm and a width of 60 mm and is many meters long. The optical attenuation is measured as 0.4 dB⁄m. Such attenuation outperforms that of conventional planar waveguides by several orders of magnitude.
Splice-free interfacing of photonic crystal fibers
S. G. Leon-Saval,
T. A. Birks,
N. Y. Joly,
A. K. George,
W. J. Wadsworth,
G. Kakarantzas,
P. St.J. Russell
We report a new method for making low-loss interfaces between conventional single-mode fibers and photonic crystal fibers (PCFs). Adapted from the fabrication of PCF preforms from stacked tubes and rods, this method avoids the need for splicing and is versatile enough to interface to virtually any type of index-guiding silica PCF. We illustrate the method by forming interfaces to two problematic types of PCF, highly nonlinear and multicore. In particular, we believe this to be the first method capable of individually coupling light into and out of all the cores of a fiber with multiple closely spaced cores, without input or output cross talk.
Intermediate asymptotic evolution and photonic bandgap fiber compression of optical similaritons around 1550 nm
C. Billet,
J. M. Dudley,
N. Joly,
J. C. Knight
Optics Express
13
3236-3241
(2005)
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We report the complete characterization of the self-similar scaling of parabolic pulse similaritons in an optical fiber amplifier. High dynamic range frequency resolved optical gating allows the direct observation of the evolution of a hyperbolic secant-like input pulse to an asymptotic amplifier similariton, and reveals the presence of intermediate asymptotic wings about the parabolic pulse core. These results are used to optimize additional self-similar propagation in highly-nonlinear fiber and subsequent compression in hollow-core photonic bandgap fiber.
Kontakt
Forschungsgruppe Nicolas Joly
Professur für Photonik Friedrich-Alexander-Universität Erlangen-Nürnberg
und
Max-Planck-Institut für die Physik des Lichts Staudtstr. 2 91058 Erlangen, Germany
