Journal
OPTICS EXPRESS
Volume 21, Issue 9, Pages 10597-10605Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.010597
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Funding
- KAKENHI from MEXT [20104004]
- JSPS [23360135]
- Photon Frontier Network Program of MEXT in Japan
- Grants-in-Aid for Scientific Research [23360135, 20104004] Funding Source: KAKEN
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Picosecond-pulse-generation dynamics and pulse-width limiting factors via spectral filtering from intensely pulse-excited gain-switched 1.55-mu m distributed-feedback laser diodes were studied. The spectral and temporal characteristics of the spectrally filtered pulses indicated that the short-wavelength component stems from the initial part of the gain-switched main pulse and has a nearly linear down-chirp of 5.2 ps/nm, whereas long-wavelength components include chirped pulse-lasing components and steady-state-lasing components. Rate-equation calculations with a model of linear change in refractive index with carrier density explained the major features of the experimental results. The analysis of the expected pulse widths with optimum spectral widths was also consistent with the experimental data. (C) 2013 Optical Society of America
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