Reflection-type normaily-on two-wavelength modulator

Chia-Ming Tsai*, Chien Ping Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations


The authors demonstrate a novel reflection-type normally-on two-wavelength modulator by combining two quantum-well structures with different operating wavelengths in a coupled cavity structure. Reflection spectra show simultaneous modulations at wavelengths of 856 and 886 nm in the device consisting of GaAs/AlGaAs and InGaAs/AlGaAs quantum wells for each wavelength. Under separate applied voltages, maximum reflectivity changes of 70 and 54% were obtained for the two wavelengths. To the best of the authors' knowledge, this is the first two-wavelength reflection modulator ever reported.

Original languageEnglish
Pages (from-to)611-613
Number of pages3
JournalElectronics Letters
Issue number7
StatePublished - 27 Mar 1997


  • Optical modulation
  • Semiconductor quantum wells

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