Abstract

We report on a simple technique to measure the anomalous dispersion of small-core microstructured fibers using short optical pulses. The method relies on the spectral modulation resulting from the evolution of the input pulse into a propagating soliton wave. The technique allows for a direct measurement of the dispersion at the desired wavelength from a single pulse. The measurement error is estimated to be less than 10%.

© 2004 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1.

Measured dispersion values for the highly-birefringent MF. The red squares and blue triangles represent the values obtained using the spectral modulation technique. The solid line indicates the measurement results obtained with white-light interferometry. Inset: typical spectrum recorded at the fiber output.

Fig. 2.
Fig. 2.

Experimental spectra recorded at the output of the small-core MF for increasing input power from bottom to top. For clarity, an arbitrary vertical offset has been added to each curve. The peak power of the input pulses is of the order of a few watts.

Fig. 3.
Fig. 3.

Measured dispersion values for the 1-µm core MF.

Fig. 4.
Fig. 4.

Simulated spectrum at the output of a 2-m long MF for various ε-values. For clarity, an arbitrary vertical offset has been added to each curve.

Equations (3)

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i U ξ + 1 2 2 U τ 2 + N 2 U 2 U = 0 ,
ϕ ( ε , z , λ ) = 4 π 2 c 2 T 0 2 ( 1 λ 1 λ 0 ) 2 + ( 1 + 2 ε ) 2 2 · L T 0 2 β 2 + 2 tan 1 ( 2 π c T 0 1 λ 1 λ 0 1 + 2 ε ) ,
D ( λ ) = 2 π c λ 2 β 2 2 c L · 10 6 ( λ 0 λ 2 1 ) 2 ( λ 0 λ 1 1 ) 2 [ ps nm · km ] ,

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