We have developed two types of high-speed semiconductor optical modulators operating at 40 Gbit/s with reduced driving voltage. One is a compact Mach-Zehnder modulator module. The modulator chip has an n-i-n isotype heterostructure for high-speed and low-driving-voltage operation. We obtained error-free operation in a push-pull configuration with a peak-to-peak voltage of 1.3 V. The other is an electroabsorption modulator integrated with microwave coplanar waveguides. A narrow core buried with polyimide provides a steady large extinction ratio and a 3-dB-down frequency as large as 46 GHz. The fabricated modulator operates at a driving voltage as low as 0.79 V.
|Number of pages||6|
|Journal||NTT Technical Review|
|Publication status||Published - Jul 1 2006|
ASJC Scopus subject areas
- Computer Science Applications
- Computer Networks and Communications
- Electrical and Electronic Engineering