Performance of Traveling-Wave Electroabsorption Modulators Depending on Microwave Properties of Waveguides Calculated Using the FDTD Method

Seungki Nam, Yonggyoo Kim, Jaehoon Lee, Moonil Kim, Jichai Jeong

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We present a method to analyze electrical and optical characteristics of traveling-wave electroabsorption modulators (TW-EAMs) using the finite-difference time-domain method. We consider the interaction between electromagnetic fields and optical powers in waveguides in time domain to model electrical and optical behaviors of TW-EAMs. The effects of microwave properties of waveguides on modulation response and output optical power of TW-EAMs are analyzed by the proposed method. The characteristic impedance of TW-EAMs is more important than microwave index to obtain large modulation bandwidth of TW-EAMs when impedance matching techniques are not used. However, effective refractive index match between microwave and lightwave becomes important as the waveguide length increases. The microwave property closely related to the extinction ratio of output optical powers is the microwave loss. When impedance match is achieved by low-impedance termination, the velocity matching between microwave and lightwave becomes important.

Original languageEnglish
Pages (from-to)763-769
Number of pages7
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume9
Issue number3
DOIs
Publication statusPublished - 2003 May

Keywords

  • Electroabsorption
  • Finite-difference time-domain (FDTD) method
  • Traveling-wave modulator

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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