Abstract

A femtosecond pulse characterization technique is developed using frequency-resolved optical gating based on the two-photon absorption in an InP crystal. The technique provides direct visual monitoring of pulse frequency chirping in the time-spectral domain for femtosecond pulses with a pulse energy as low as 3.8 pJ. Pulse chirping and pedestal wings of 10-GHz optical fiber solitons are characterized experimentally for the first time by this technique.

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References

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  1. R. Trebino,K.W. DeLong,D.N.Fittinghoff,J.N. Sweetser,M.A.Krumb�gel,B.A.Richman and D.J. Kane,"Measuring ultrashort laser pulses in the time-frequency domain using frequency-resolved optical gating," Rev. Sci.Instrum. 68, 3277-3295 (1997).
    [CrossRef]
  2. J.M. Dudley, L.P. Barry, P.G. Bolland, J.D. Harvey, R. Leonhardt and P.D. Drummond,"Direct measurement of pulse distortion near the zero-dispersion wavelength in an optical fiber by frequency-resolved optical gating," Opt. Lett. 22, 457-459 (1997).
    [CrossRef] [PubMed]
  3. S.Linden, H.Giessen and J.Kuhl, "XFROG - a new method for amplitude and phase characterization of weak ultrashort pulses," Phys. Stat. Sol.(b)206, 119-124 (1998).
    [CrossRef]
  4. M. Sheik-Bahae, D.C. Hutchings, D.J. Hagan and E.W. Van Stryland, "Dispersion of bound electronic nonlinear refraction in solids," IEEE. J. Quantum Electron. 27, 1296-1309 (1991).
    [CrossRef]
  5. Y.R. Shen, The principles of nonlinear optics (Wiley, New York, 1984) Chap.12.
  6. H.K. Tsang, P.A.Snow, I.E.Day,I.H. White, R.V. Penty, R.S. Grant, Z.Su, G.T. Kennedy and W. Sibbet,"All-optical modulation with ultrafast recovery at low pump energies in passive InGaAs/InGaAsP multiquantum well waveguides," Appl. Phys. Lett. 62, 451-1453 (1993).
    [CrossRef]
  7. E. Martinez,"3000 times grating compressor with positive group velocity dispersion:application to fiber compression in 1.3-1.6 �m region," IEEE.J.Quantum Electron. QE-23, 59-64 (1987).
    [CrossRef]
  8. M.D. Pelusi, Y. Matsui and A.Suzuki,"Frequency tunable femtosecond pulse generation from an electroabsorption modulator by enhanced higher order soliton compression in dispersion decreasing fiber," Electron. Lett. 35, 734-736, (1999).
    [CrossRef]

Other

R. Trebino,K.W. DeLong,D.N.Fittinghoff,J.N. Sweetser,M.A.Krumb�gel,B.A.Richman and D.J. Kane,"Measuring ultrashort laser pulses in the time-frequency domain using frequency-resolved optical gating," Rev. Sci.Instrum. 68, 3277-3295 (1997).
[CrossRef]

J.M. Dudley, L.P. Barry, P.G. Bolland, J.D. Harvey, R. Leonhardt and P.D. Drummond,"Direct measurement of pulse distortion near the zero-dispersion wavelength in an optical fiber by frequency-resolved optical gating," Opt. Lett. 22, 457-459 (1997).
[CrossRef] [PubMed]

S.Linden, H.Giessen and J.Kuhl, "XFROG - a new method for amplitude and phase characterization of weak ultrashort pulses," Phys. Stat. Sol.(b)206, 119-124 (1998).
[CrossRef]

M. Sheik-Bahae, D.C. Hutchings, D.J. Hagan and E.W. Van Stryland, "Dispersion of bound electronic nonlinear refraction in solids," IEEE. J. Quantum Electron. 27, 1296-1309 (1991).
[CrossRef]

Y.R. Shen, The principles of nonlinear optics (Wiley, New York, 1984) Chap.12.

H.K. Tsang, P.A.Snow, I.E.Day,I.H. White, R.V. Penty, R.S. Grant, Z.Su, G.T. Kennedy and W. Sibbet,"All-optical modulation with ultrafast recovery at low pump energies in passive InGaAs/InGaAsP multiquantum well waveguides," Appl. Phys. Lett. 62, 451-1453 (1993).
[CrossRef]

E. Martinez,"3000 times grating compressor with positive group velocity dispersion:application to fiber compression in 1.3-1.6 �m region," IEEE.J.Quantum Electron. QE-23, 59-64 (1987).
[CrossRef]

M.D. Pelusi, Y. Matsui and A.Suzuki,"Frequency tunable femtosecond pulse generation from an electroabsorption modulator by enhanced higher order soliton compression in dispersion decreasing fiber," Electron. Lett. 35, 734-736, (1999).
[CrossRef]

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Figures (7)

Fig. 1.
Fig. 1.

Apparatus for TPA autocorrelation and spectrogram measurements.

Fig. 2.
Fig. 2.

Left: TPA autocorrelation traces with different incident pulse energies. Right: pulse energy dependence of the TPA peak intensity from the autocorrelation traces (red dots) and a theoretical curve in the weak absorption limit (blue curve).

Fig. 3.
Fig. 3.

TPA autocorrelation trace for transform-limit OPO pulses with gate and probe pulse energies of 100 and 1 pJ, respectively.

Fig. 4.
Fig. 4.

TPA pulse intensity spectrograms for OPO pulses with a negative, zero and a positive group delay dispersion.

Fig. 5.
Fig. 5.

Pulse intensity (red dots) and phase shift (blue dots) data retrieved from the TPA spectrograms for the OPO pulses in Fig. 4.

Fig. 6.
Fig. 6.

Time-integrated spectrum (left) and TPA pulse intensity spectrogram (right) of 10-GHz optical fiber soliton pulses. Inset: a set-up for the soliton pulse generation.

Fig. 7.
Fig. 7.

The retrieved and theoretical intensity (red dots) and phase of the soliton pulses (blue dots). Inset: theoretical intensity of the pulses in a magnified scale.

Equations (3)

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I ( d ) = I 0 ( 1 + I 0 β d ) .
Δ I ( d ) = ( 4 W pulse π D 2 τ pulse ) 2 β d ,
S TPA ( ω , τ ) = + d t E ( t ) E ( t τ ) 2 e i ω t 2 ,

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