Tomoyuki Akiyama

TL;DR: In this paper, a theory of optical signal amplification and processing by quantum-dot semiconductor optical amplifiers (SOA's) based on the density matrix equations to treat electron-light interaction and the optical pulse propagation equations is presented.

TL;DR: In this paper, a temperature-insensitive 10 Gb s−1 laser diodes on a GaAs substrate at 1.3 µm were used for optical telecommunication.

TL;DR: In this paper, a theory and simulation of quantum-dot semiconductor optical amplifiers (SOAs) for high-bit-rate optical signal processing is presented, which includes spatial isolation of quantum dots, carrier relaxation and excitation among the discrete energy states and the wetting layer, grouping of dots by their optical resonant frequency under the inhomogeneous broadening, and the homogeneous widening of the single-dot gain.

TL;DR: In this paper, a semiconductor optical amplifier (SOA) having a gain of >25 dB, noise figure of 19 dBm, over the record widest bandwidth of 90 nm among all kinds of optical amplifiers, and also having a penalty-free output power of 23 dBm was realized by using quantum dots.

TL;DR: In this article, temperature-insensitive eye-opening under 10-Gb/s direct modulation of 1.3-µm p-doped quantum-dot lasers without using any current adjustments was demonstrated.