Adopting nanometer-sized semiconductor particles, called quantum dots, in the active regions of photonic devices provides the characteristics specific to 3-dimensional quantum effects. This will greatly improve the performance of photonic devices in many respects. This paper is developing quantum-dot lasers and quantum-dot optical amplifiers through joint research conducted with the University of Tokyo. This paper introduces the development of technology for these devices, along with some recent results. For quantum-dot lasers, one has realized temperature-insensitive direct modulation at a modulation rate of 10 Gb/s in the 1.3-?m wavelength range. The paper has also fabricated high-performance, quantum-dot optical amplifiers with a wide bandwidth of over 100 nm, high gain of 20 dB, and high optical output power of over +20 dBm.
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