High-speed distributed feedback laser and InGaAs avalanche photodiodes

Optical semiconductor devices, including InGaAsP/InP distributed feedback lasers and InGaAs avalanche photodiodes, are required for high-bit-rate transmission systems. In distributed-feedback lasers, it is important to increase the 3-dB bandwidth, to reduce the frequency chirping, and to stabilize the longitudinal mode under large signal modulation. For avalanche photodiodes, high gain-bandwidth product, low multiplication noise, low multiplied dark current, and low capacitance are key factors. How to realize these characteristics is discussed.<
>