Very-High-Speed InP/InGaAs HBT Multiplexer ICs for Optical Communication Systems

This paper describes the circuit design of very-high-performance multiplexer (MUX) ICs for optical communications systems. The sophisticated circuit design includes optimization of collector current density of each transistor to achieve both low-power consumption and high-speed operation. Low-power over-40-Gbit/s 16:1 MUX and high-speed 100-Gbit/s selector-type MUX ICs were successfully designed using InP/InGaAs heterojunction bipolar transistors (HBTs)