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Bright and dark 40 GHz parabolic pulse generation using a picosecond optical pulse train and an arrayed waveguide
Toshihiko Hirooka1, Masataka Nakazawa, Katsunari Okamoto
1Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. hirooka@riec.tohoku.ac.jp
Optics Letters
|May 17, 2008
Summary
Researchers generated parabolic optical pulses by controlling spectral modes of a fiber laser. This technique creates linear chirping for advanced optical signal processing and Fourier transformations.
Area of Science:
- Photonics
- Optical Engineering
- Laser Physics
Background:
- Mode-locked fiber lasers produce picosecond pulse trains.
- Spectral manipulation is key for advanced optical pulse shaping.
- Parabolic pulses offer linear frequency chirp for signal processing.
Purpose of the Study:
- To demonstrate parabolic optical pulse generation.
- To utilize spectral domain manipulation for pulse shaping.
- To enable applications in optical signal processing.
Main Methods:
- Generating picosecond optical pulse trains from a 40 GHz mode-locked fiber laser.
- Employing a 64-channel arrayed waveguide grating pulse shaper.
- Manipulating intensity and phase of individual longitudinal modes in the spectral domain.
Main Results:
- Successfully generated bright and dark parabolic optical pulses.
- Achieved precise control over spectral intensity and phase.
- Demonstrated the linear chirping characteristic of the generated pulses.
Conclusions:
- Parabolic pulse generation is feasible via spectral mode control.
- The generated pulses are suitable for optical signal processing.
- Applications include pulse compression and time-domain optical Fourier transformation.
