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Experimental generation of parabolic pulses via Raman amplification in optical fiber

Christophe Finot, Guy Millot, Cyril Billet, and John M. Dudley

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Abstract

Parabolic pulse generation via Raman amplification is experimentally demonstrated in 5.3 km of non-zero dispersion shifted fiber presenting normal group velocity dispersion at the injected signal pulse wavelength of 1550 nm. The fiber is pumped by a commercially-available continuous wave source at 1455 nm, and the intensity and chirp of the amplifier output are characterized using frequency-resolved optical gating. For 2.4 pJ input pulses of 10 ps duration, the output pulse characteristics are studied as a function of amplifier gain over the range 11–24 dB, allowing the evolution of the input pulse to a parabolic pulse to be clearly seen for amplifier gains exceeding 15 dB. Numerical compression of the output pulses show that near chirp-free pulses can be obtained using only linear chirp compensation.

©2003 Optical Society of America

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Figures (5)
Fig.1.
Fig.1. (a) Parabolic pulse evolution over 5.3 km in a NZ-DSF Raman amplifier. (b) The top figure shows the simulation output pulse intensity and chirp (solid lines) together with parabolic and linear fits respectively (circles). The bottom figure plots the simulation output (solid line) and parabolic fit (circles) on a logarithmic scale, and also includes gaussian (long dashes) and sech2 (short dashes) fits to illustrate the comparatively poor fits obtained using these pulse shapes compared to a parabolic pulse.

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Fig 2.
Fig 2. Schematic diagram of experimental set-up.

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Fig. 3.
Fig. 3. (a) Measured FROG trace of the amplified output pulses obtained with 0.75 pJ input pulses and 17 dB gain. (b) The retrieved intensity and chirp (circles) compared with the expected results from the numerical simulations described in Section 2 (solid lines).

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Fig. 4.
Fig. 4. Measured FROG traces and retrieved intensity and chirp obtained at the amplifier output for gains of (a) 11.4 dB, (b) 17.7 dB and (c) 20.8 dB. The retrieved intensity and chirp (solid lines) are compared respectively with least-squares parabolic and linear fits (circles), clearly showing the evolution of the amplifier output to a parabolic profile with increasing gain.

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Fig. 5
Fig. 5 (a) Pulse duration and spectral width as a function of amplifier gain. (b) Intensity and chirp of compressed pulse obtained after linear chirp compensation of the output parabolic pulse obtained with 20.8 dB gain.

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