Abstract

We propose a novel linear filtering scheme based on ultrafast all-optical differentiation for re-shaping of ultrashort pulses generated from a mode-locked laser into flat-top pulses. The technique is demonstrated using simple all-fiber optical filters, more specifically uniform long period fiber gratings (LPGs) operated in transmission. The large bandwidth typical for these fiber filters allows scaling the technique to the sub-picosecond regime. In the experiments reported here, 600-fs and 1.8-ps Gaussian-like optical pulses (@ 1535 nm) have been re-shaped into 1-ps and 3.2-ps flat-top pulses, respectively, using a single 9-cm long uniform LPG.

© 2006 Optical Society of America

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References

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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
  7. L. Qian, A. M. H. Wong, S. A. Neata, and X. Gu, "Simple and efficient optical pulse shaping: new algorithm and experimental demonstration," Conference on Lasers and Electro-Optics (CLEO) 2006, Long Beach, CA, USA. Paper JWB-33.
  8. J. H. Lee, P. C. The, P. Petropoulos, M. Ibsen, and D. J. Richardson, "All-optical modulation and demultiplexing systems with significant timing jitter tolerance through incorporation of pulse shaping fiber Bragg gratings," IEEE Photon. Technol. Lett. 14, 203-205 (2002).
    [CrossRef]
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  10. L. K. Oxenlowe, M. Galili, A. T. Clausen, and P. Jeppesen, "Generating a square switching window for timing jitter tolerant 160Gb/s demutiplexing by the optical Fourier transform technique," Proc. of the 32nd European Conference on Optical Communication (ECOC 2006), Cannes, France, September 2006. Paper We2.3.4.
  11. M. Kulishov, Y. Park, J. Azaña, and R. Slavík, "(Sub-)Picosecond Flat-Top Waveform Generation using a Single Uniform Long-Period Fiber Grating," in Proc. of European Conference on Optical Communications (ECOC 2006), Cannes, France, September 2006. Paper We2.3.7
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2006 (3)

R. Slavík, Y. Park, M. Kulishov, R. Morandotti, and J. Azaña, "Ultrafast all-optical differentiators, " Opt. Express 14, 10699-10707 (2006).
[CrossRef] [PubMed]

R. Slavík, "Extremely deep long-period fiber grating made with CO2 laser," IEEE Photon. Technol. Lett. 18, 1705-1707 (2006).
[CrossRef]

Y. Park, F. Li, and J. Azaña, "Characterization and optimization of optical pulse differentiation using spectral interferometry," IEEE Photon. Technol. Lett. 18, 1798-1800 (2006).
[CrossRef]

2005 (2)

2004 (1)

2003 (1)

2002 (1)

J. H. Lee, P. C. The, P. Petropoulos, M. Ibsen, and D. J. Richardson, "All-optical modulation and demultiplexing systems with significant timing jitter tolerance through incorporation of pulse shaping fiber Bragg gratings," IEEE Photon. Technol. Lett. 14, 203-205 (2002).
[CrossRef]

2001 (2)

1995 (2)

1989 (1)

Azaña, J.

Bachim, B. L.

Bralwish, I.

Chériaux, G.

Da Silva, H. J. A.

Ellis, A. D.

Eom, T. J.

Gaylord, T.K.

Ibsen, M.

Joffre, M.

Kim, S. J.

Kulishov, M.

Lee, B. H.

Lee, J. H.

J. H. Lee, P. C. The, P. Petropoulos, M. Ibsen, and D. J. Richardson, "All-optical modulation and demultiplexing systems with significant timing jitter tolerance through incorporation of pulse shaping fiber Bragg gratings," IEEE Photon. Technol. Lett. 14, 203-205 (2002).
[CrossRef]

Lepetit, L.

Li, F.

Y. Park, F. Li, and J. Azaña, "Characterization and optimization of optical pulse differentiation using spectral interferometry," IEEE Photon. Technol. Lett. 18, 1798-1800 (2006).
[CrossRef]

Morandotti, R.

O’Reilly, J.J.

Park, C. S.

Park, Y.

Y. Park, F. Li, and J. Azaña, "Characterization and optimization of optical pulse differentiation using spectral interferometry," IEEE Photon. Technol. Lett. 18, 1798-1800 (2006).
[CrossRef]

R. Slavík, Y. Park, M. Kulishov, R. Morandotti, and J. Azaña, "Ultrafast all-optical differentiators, " Opt. Express 14, 10699-10707 (2006).
[CrossRef] [PubMed]

Parmigiani, F.

Petropoulos, P.

Richardson, D. J.

Slavík, R.

R. Slavík, Y. Park, M. Kulishov, R. Morandotti, and J. Azaña, "Ultrafast all-optical differentiators, " Opt. Express 14, 10699-10707 (2006).
[CrossRef] [PubMed]

R. Slavík, "Extremely deep long-period fiber grating made with CO2 laser," IEEE Photon. Technol. Lett. 18, 1705-1707 (2006).
[CrossRef]

The, P. C.

J. H. Lee, P. C. The, P. Petropoulos, M. Ibsen, and D. J. Richardson, "All-optical modulation and demultiplexing systems with significant timing jitter tolerance through incorporation of pulse shaping fiber Bragg gratings," IEEE Photon. Technol. Lett. 14, 203-205 (2002).
[CrossRef]

Appl. Opt. (1)

IEEE Photon. Technol. Lett. (3)

J. H. Lee, P. C. The, P. Petropoulos, M. Ibsen, and D. J. Richardson, "All-optical modulation and demultiplexing systems with significant timing jitter tolerance through incorporation of pulse shaping fiber Bragg gratings," IEEE Photon. Technol. Lett. 14, 203-205 (2002).
[CrossRef]

R. Slavík, "Extremely deep long-period fiber grating made with CO2 laser," IEEE Photon. Technol. Lett. 18, 1705-1707 (2006).
[CrossRef]

Y. Park, F. Li, and J. Azaña, "Characterization and optimization of optical pulse differentiation using spectral interferometry," IEEE Photon. Technol. Lett. 18, 1798-1800 (2006).
[CrossRef]

J. Lightwave Technol. (2)

J. Opt. Soc. Am. A (1)

J. Opt. Soc. Am. B (1)

Opt. Express (2)

Opt. Lett. (2)

Prog. Quantum Electron. (1)

see for instance, A. M. Weiner, "Femtosecond optical pulse shaping and processing," Prog. Quantum Electron. 19, 161-237 (1995).
[CrossRef]

Other (3)

L. K. Oxenlowe, M. Galili, A. T. Clausen, and P. Jeppesen, "Generating a square switching window for timing jitter tolerant 160Gb/s demutiplexing by the optical Fourier transform technique," Proc. of the 32nd European Conference on Optical Communication (ECOC 2006), Cannes, France, September 2006. Paper We2.3.4.

M. Kulishov, Y. Park, J. Azaña, and R. Slavík, "(Sub-)Picosecond Flat-Top Waveform Generation using a Single Uniform Long-Period Fiber Grating," in Proc. of European Conference on Optical Communications (ECOC 2006), Cannes, France, September 2006. Paper We2.3.7

L. Qian, A. M. H. Wong, S. A. Neata, and X. Gu, "Simple and efficient optical pulse shaping: new algorithm and experimental demonstration," Conference on Lasers and Electro-Optics (CLEO) 2006, Long Beach, CA, USA. Paper JWB-33.

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Figures (5)

Fig. 1.
Fig. 1.

Numerically simulated intensity (a) and phase (b) temporal profiles of the synthesized waveforms at the output of the uniform LPG (parameters and characteristics are given in the text) assuming a 1.8-ps Gaussian input pulse for different values of the input pulse-LPG wavelength detuning, Δλ.

Fig. 2.
Fig. 2.

Simulated (dashed) and measured (solid) amplitude (a) and phase (b) spectral characteristics of the used LPG.

Fig. 3.
Fig. 3.

Experimentally generated intensity (a) and phase (b) temporal profiles of the synthesized waveforms at the uniform LPG output when a 1.8-ps input pulse is launched at the input for the same input pulse-LPG wavelength detuning (Δλ) conditions as in the simulations in Fig. 1.

Fig. 4.
Fig. 4.

Measured spectra corresponding to the synthesized waveforms in Fig. 3.

Fig. 5.
Fig. 5.

Numerically simulated (dashed curves) and experimentally measured (solid curves) intensity profiles of the ‘flat-top’ temporal waveforms generated at the LPG output with two input pulses of different FWHM time widths (1.8 ps in (a) and 600 fs in (b)). Notice the different scaling of the time axis in the two graphs. (c) The corresponding measured autocorrelation traces.

Equations (1)

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v ( t ) 2 u ( t ) t 2 + Δ ω 2 u ( t ) 2 ,

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