| Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2021: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
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| Outline of Final Research Achievements |
We fabricated ridge-type waveguide laser diodes (LDs) based on high-quality InGaAs quantum well active layer with wavelength bands around 1000 nm grown on GaAs substrates. High-speed short pulses of 8-12 picoseconds were generated from a number of homemade LDs. Clean rectangular light pulses without spike pulse component were generated by electrical control of bias and multi-step pulse excitations. A commercially available DFB-LD with the fastest modulation bandwidth of 30 GHz was obtained, and gain switching experiments were performed with our developed setup. With 90-ps electrical pulse pumping and chirp compensation via a single-mode fiber, short pulse width of 5.3 ps near the Fourier transport limit was obtained without using additional spectral filtering or nonlinear pulse compression.
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