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Characteristics of pulse trapping by use of ultrashort soliton pulses in optical fibers across the zero-dispersion wavelength

Norihiko Nishizawa and Toshio Goto

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Abstract

The characteristics of pulse trapping by use of ultrashort soliton pulses in optical fibers across the zero-dispersion wavelength are analyzed both experimentally and numerically. The spectrogram of pulse trapping is observed by use of the cross-correlation frequency-resolved optical gating technique, and the phenomenon of pulse trapping is confirmed directly. The pulse trapping is numerically analyzed by use of the coupled strict nonlinear Schrödinger equations, and the numerical results are in good agreement with the experimental ones. It is clarified that the pulse trapping results from the sequential cross-phase modulation by the Raman-shifted soliton pulse.

©2002 Optical Society of America

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Supplementary Material (3)

Media 1: MOV (222 KB)     
Media 2: MOV (690 KB)     
Media 3: MOV (1172 KB)     

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Figures (5)
Fig. 1.
Fig. 1. Experimental setup of pulse trapping by ultrashort soliton pulse across the zero-dispersion wavelength.

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Fig. 2.
Fig. 2. Variation of optical spectra of output pulses for pulse trapping. The dotted line represents the delay time in fiber owing to chromatic dispersion.

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Fig. 3.
Fig. 3. Characteristics of wavelength shift of soliton and trapped pulse as a function of power of soliton pulse in front of PM-HN-DSF2.

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Fig. 4.
Fig. 4. Observed spectrogram of output pulses when pulse trapping occurs. The fiber length is 10 m.

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Fig. 5.
Fig. 5. ((a) 223KB, (b) 690KB, (c) 1.17MB) Variation of (a) temporal and (b) spectral waveforms, and (c) spectrogram of soliton and trapped pulse. The corresponding propagation length is (a)(c) 0-15 m and (b) 0-150 m. In order to clarify the behavior of pulse trapping, the signal pulse is enlarged. In (a) and (c), the horizontal axis represents the magnitude of T, which is the temporal axis moving with the initial group velocity of the soliton pulse at fiber input. In (a) and (b), the red and blue lines show the soliton and signal pulses, respectively.

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Equations (2)

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∂ A ∂ z + i β 2 A 2 ∂ 2 A ∂ T 2 − β 3 A 6 ∂ 3 A ∂ T 3 = i γ ( ∣ A ∣ 2 A + 2 ∣ B ∣ 2 A + i ω 0 A ∂ ∣ A ∣ 2 A ∂ T − T R A ∂ ∣ A ∣ 2 ∂ T )
∂ B ∂ z − d ∂ B ∂ T + i β 2 B 2 ∂ 2 B ∂ T 2 − β 3 B 6 ∂ 3 A ∂ T 3 = i γ ( ∣ B ∣ 2 B + 2 ∣ A ∣ 2 B + i ω 0 B ∂ ∣ B ∣ 2 B ∂ T − T R B ∂ ∣ B ∣ 2 ∂ T )
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