ABSTRACT

The demands for large capacity optical transmission systems have rapidly increased in resent years. To integrate the systems by using time-division multiplexing (TDM) technology, high speed optical devices [1], broadband analog ICs, and high-speed digital ICs are indispensable. In such systems, the modulator drivers for electro absorption (EA) modulators or Mach-Zehnder modulators must normally operate at both high-speed and large drive voltage which are required to ensure a sufficient extinction ratio at lOGbps. So modulator drivers are the most critical components.